Code
P1473
BMW
P — Powertrain
Diagnostic Module Tank Leakage DM-TL Pump Current Plausibility
Views:
UK: 15
EN: 38
RU: 20
AI status
Completed
Completed
100%
Causes
- Leaky, corroded or disconnected electrical connector at tank/EVAP pump
- Damaged or shorted wiring harness (open, short to ground/voltage, high resistance) to the DM-TL pump
- Failed or seized tank leak detection (EVAP) pump or internal motor fault
- Blocked or restricted EVAP lines, valves, or charcoal canister causing abnormal mechanical load on pump
- Low vehicle battery voltage or poor ground connection causing incorrect pump current
- Faulty DM-TL control module or engine control module (ECU) calibration/software error
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated for EVAP/DM-TL fault
- EVAP leak test cannot be completed or monitor reports failed/incomplete
- Possible fuel smell from vehicle if EVAP path compromised
- No drivability symptoms in many cases, though pump may be noisy or silent when commanded
- Vehicle may fail emissions readiness/self-test
What to check
- Read DTCs and freeze-frame data with a capable BMW scan tool; note operating conditions when code set
- Check live data: commanded DM-TL pump on/off, pump current, pump voltage, module status and any related EVAP codes
- Visually inspect connectors and wiring at the tank/EVAP pump and DM-TL module for corrosion, damage, pin backout, or moisture
- Check fuse(s) and relay(s) supplying the pump and module
- Measure supply voltage to pump connector with pump commanded ON (should be near battery voltage ~11–14.5 V)
- Measure pump current with a DC clamp ammeter while the pump is commanded; compare to expected range
Signal parameters
- Expected pump supply voltage (commanded ON): approx. battery voltage 11–14.5 V (varies by vehicle)
- Pump current while running: commonly in the range of ~0.3–3.0 A depending on pump design — large deviations (near 0 A or >5–8 A) indicate fault
- Pump coil resistance (cold, connector removed): typically low ohms (example 5–30 Ω) — open or shorted coil out of range
- Supply continuity:
- Ground voltage drop under load:
Diagnostic algorithm
- Connect BMW-capable scan tool, confirm P1473 and note freeze-frame/live data (pump command state, pump current, supply voltage).
- Visually inspect EVAP pump connector, wiring harness, and module connectors for corrosion, damage, moisture, or pin issues. Repair as needed.
- With connector connected, command DM-TL pump ON via scan tool and observe live pump current and voltage. Record values. If pump does not run and voltage is present, suspect pump fault.
- If no voltage at pump connector when commanded, check related fuses, relays, and continuity back to module. Repair wiring or replace relay/fuse as required.
- If voltage present but current low or zero, disconnect connector and measure pump coil resistance. If open or out-of-spec, replace pump.
- If coil resistance appears normal, bench-test pump by applying proper battery voltage briefly to confirm mechanical operation and current draw. Replace pump if abnormal.
- If pump current is excessively high when running, inspect for mechanical binding or restriction in EVAP lines/valve/canister; perform smoke test and clear blockages.
- Perform voltage drop tests on supply and ground circuits under load (while pump running) to detect high-resistance connections. Repair grounds and high-resistance splices.
- After repairs, clear codes and rerun pump plausibility/self-test cycles until monitor completes and code does not return. Check for related EVAP codes and address those as needed.
- If wiring, pump, fuses, and grounds are OK but fault persists, check for ECU/DM-TL module updates or consider module diagnostics/replacement per manufacturer guidance.
Likely causes
- Failed EVAP/tank leak detection pump (most common)
- Corroded/intermittent connector or damaged wiring between pump and module
- High resistance ground or supply (fuse, relay, chassis ground)
- Obstruction in EVAP plumbing increasing pump load
- Module failure or incorrect software/calibration
Fault status
Status
Fault stored by DM-TL module for pump current plausibility. May be set as intermittent or confirmed; MIL may be on and EVAP test inhibited until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1473
FORD
P — Powertrain
Fan Secondary High with Fans Off
Views:
UK: 16
EN: 35
RU: 23
AI status
Completed
Completed
100%
Causes
- Leaky, corroded or disconnected electrical connector at tank/EVAP pump
- Damaged or shorted wiring harness (open, short to ground/voltage, high resistance) to the DM-TL pump
- Failed or seized tank leak detection (EVAP) pump or internal motor fault
- Blocked or restricted EVAP lines, valves, or charcoal canister causing abnormal mechanical load on pump
- Low vehicle battery voltage or poor ground connection causing incorrect pump current
- Faulty DM-TL control module or engine control module (ECU) calibration/software error
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated for EVAP/DM-TL fault
- EVAP leak test cannot be completed or monitor reports failed/incomplete
- Possible fuel smell from vehicle if EVAP path compromised
- No drivability symptoms in many cases, though pump may be noisy or silent when commanded
- Vehicle may fail emissions readiness/self-test
What to check
- Read DTCs and freeze-frame data with a capable BMW scan tool; note operating conditions when code set
- Check live data: commanded DM-TL pump on/off, pump current, pump voltage, module status and any related EVAP codes
- Visually inspect connectors and wiring at the tank/EVAP pump and DM-TL module for corrosion, damage, pin backout, or moisture
- Check fuse(s) and relay(s) supplying the pump and module
- Measure supply voltage to pump connector with pump commanded ON (should be near battery voltage ~11–14.5 V)
- Measure pump current with a DC clamp ammeter while the pump is commanded; compare to expected range
Signal parameters
- Expected pump supply voltage (commanded ON): approx. battery voltage 11–14.5 V (varies by vehicle)
- Pump current while running: commonly in the range of ~0.3–3.0 A depending on pump design — large deviations (near 0 A or >5–8 A) indicate fault
- Pump coil resistance (cold, connector removed): typically low ohms (example 5–30 Ω) — open or shorted coil out of range
- Supply continuity:
- Ground voltage drop under load:
Diagnostic algorithm
- Connect BMW-capable scan tool, confirm P1473 and note freeze-frame/live data (pump command state, pump current, supply voltage).
- Visually inspect EVAP pump connector, wiring harness, and module connectors for corrosion, damage, moisture, or pin issues. Repair as needed.
- With connector connected, command DM-TL pump ON via scan tool and observe live pump current and voltage. Record values. If pump does not run and voltage is present, suspect pump fault.
- If no voltage at pump connector when commanded, check related fuses, relays, and continuity back to module. Repair wiring or replace relay/fuse as required.
- If voltage present but current low or zero, disconnect connector and measure pump coil resistance. If open or out-of-spec, replace pump.
- If coil resistance appears normal, bench-test pump by applying proper battery voltage briefly to confirm mechanical operation and current draw. Replace pump if abnormal.
- If pump current is excessively high when running, inspect for mechanical binding or restriction in EVAP lines/valve/canister; perform smoke test and clear blockages.
- Perform voltage drop tests on supply and ground circuits under load (while pump running) to detect high-resistance connections. Repair grounds and high-resistance splices.
- After repairs, clear codes and rerun pump plausibility/self-test cycles until monitor completes and code does not return. Check for related EVAP codes and address those as needed.
- If wiring, pump, fuses, and grounds are OK but fault persists, check for ECU/DM-TL module updates or consider module diagnostics/replacement per manufacturer guidance.
Likely causes
- Failed EVAP/tank leak detection pump (most common)
- Corroded/intermittent connector or damaged wiring between pump and module
- High resistance ground or supply (fuse, relay, chassis ground)
- Obstruction in EVAP plumbing increasing pump load
- Module failure or incorrect software/calibration
Fault status
Status
Fault stored by DM-TL module for pump current plausibility. May be set as intermittent or confirmed; MIL may be on and EVAP test inhibited until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1473
LINCOLN
P — Powertrain
Fan Secondary High with Fans Off
Views:
UK: 13
EN: 37
RU: 19
AI status
Completed
Completed
100%
Causes
- Leaky, corroded or disconnected electrical connector at tank/EVAP pump
- Damaged or shorted wiring harness (open, short to ground/voltage, high resistance) to the DM-TL pump
- Failed or seized tank leak detection (EVAP) pump or internal motor fault
- Blocked or restricted EVAP lines, valves, or charcoal canister causing abnormal mechanical load on pump
- Low vehicle battery voltage or poor ground connection causing incorrect pump current
- Faulty DM-TL control module or engine control module (ECU) calibration/software error
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated for EVAP/DM-TL fault
- EVAP leak test cannot be completed or monitor reports failed/incomplete
- Possible fuel smell from vehicle if EVAP path compromised
- No drivability symptoms in many cases, though pump may be noisy or silent when commanded
- Vehicle may fail emissions readiness/self-test
What to check
- Read DTCs and freeze-frame data with a capable BMW scan tool; note operating conditions when code set
- Check live data: commanded DM-TL pump on/off, pump current, pump voltage, module status and any related EVAP codes
- Visually inspect connectors and wiring at the tank/EVAP pump and DM-TL module for corrosion, damage, pin backout, or moisture
- Check fuse(s) and relay(s) supplying the pump and module
- Measure supply voltage to pump connector with pump commanded ON (should be near battery voltage ~11–14.5 V)
- Measure pump current with a DC clamp ammeter while the pump is commanded; compare to expected range
Signal parameters
- Expected pump supply voltage (commanded ON): approx. battery voltage 11–14.5 V (varies by vehicle)
- Pump current while running: commonly in the range of ~0.3–3.0 A depending on pump design — large deviations (near 0 A or >5–8 A) indicate fault
- Pump coil resistance (cold, connector removed): typically low ohms (example 5–30 Ω) — open or shorted coil out of range
- Supply continuity:
- Ground voltage drop under load:
Diagnostic algorithm
- Connect BMW-capable scan tool, confirm P1473 and note freeze-frame/live data (pump command state, pump current, supply voltage).
- Visually inspect EVAP pump connector, wiring harness, and module connectors for corrosion, damage, moisture, or pin issues. Repair as needed.
- With connector connected, command DM-TL pump ON via scan tool and observe live pump current and voltage. Record values. If pump does not run and voltage is present, suspect pump fault.
- If no voltage at pump connector when commanded, check related fuses, relays, and continuity back to module. Repair wiring or replace relay/fuse as required.
- If voltage present but current low or zero, disconnect connector and measure pump coil resistance. If open or out-of-spec, replace pump.
- If coil resistance appears normal, bench-test pump by applying proper battery voltage briefly to confirm mechanical operation and current draw. Replace pump if abnormal.
- If pump current is excessively high when running, inspect for mechanical binding or restriction in EVAP lines/valve/canister; perform smoke test and clear blockages.
- Perform voltage drop tests on supply and ground circuits under load (while pump running) to detect high-resistance connections. Repair grounds and high-resistance splices.
- After repairs, clear codes and rerun pump plausibility/self-test cycles until monitor completes and code does not return. Check for related EVAP codes and address those as needed.
- If wiring, pump, fuses, and grounds are OK but fault persists, check for ECU/DM-TL module updates or consider module diagnostics/replacement per manufacturer guidance.
Likely causes
- Failed EVAP/tank leak detection pump (most common)
- Corroded/intermittent connector or damaged wiring between pump and module
- High resistance ground or supply (fuse, relay, chassis ground)
- Obstruction in EVAP plumbing increasing pump load
- Module failure or incorrect software/calibration
Fault status
Status
Fault stored by DM-TL module for pump current plausibility. May be set as intermittent or confirmed; MIL may be on and EVAP test inhibited until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1473
MERCURY
P — Powertrain
Fan Secondary High with Fans Off
Views:
UK: 18
EN: 38
RU: 22
AI status
Completed
Completed
100%
Causes
- Leaky, corroded or disconnected electrical connector at tank/EVAP pump
- Damaged or shorted wiring harness (open, short to ground/voltage, high resistance) to the DM-TL pump
- Failed or seized tank leak detection (EVAP) pump or internal motor fault
- Blocked or restricted EVAP lines, valves, or charcoal canister causing abnormal mechanical load on pump
- Low vehicle battery voltage or poor ground connection causing incorrect pump current
- Faulty DM-TL control module or engine control module (ECU) calibration/software error
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated for EVAP/DM-TL fault
- EVAP leak test cannot be completed or monitor reports failed/incomplete
- Possible fuel smell from vehicle if EVAP path compromised
- No drivability symptoms in many cases, though pump may be noisy or silent when commanded
- Vehicle may fail emissions readiness/self-test
What to check
- Read DTCs and freeze-frame data with a capable BMW scan tool; note operating conditions when code set
- Check live data: commanded DM-TL pump on/off, pump current, pump voltage, module status and any related EVAP codes
- Visually inspect connectors and wiring at the tank/EVAP pump and DM-TL module for corrosion, damage, pin backout, or moisture
- Check fuse(s) and relay(s) supplying the pump and module
- Measure supply voltage to pump connector with pump commanded ON (should be near battery voltage ~11–14.5 V)
- Measure pump current with a DC clamp ammeter while the pump is commanded; compare to expected range
Signal parameters
- Expected pump supply voltage (commanded ON): approx. battery voltage 11–14.5 V (varies by vehicle)
- Pump current while running: commonly in the range of ~0.3–3.0 A depending on pump design — large deviations (near 0 A or >5–8 A) indicate fault
- Pump coil resistance (cold, connector removed): typically low ohms (example 5–30 Ω) — open or shorted coil out of range
- Supply continuity:
- Ground voltage drop under load:
Diagnostic algorithm
- Connect BMW-capable scan tool, confirm P1473 and note freeze-frame/live data (pump command state, pump current, supply voltage).
- Visually inspect EVAP pump connector, wiring harness, and module connectors for corrosion, damage, moisture, or pin issues. Repair as needed.
- With connector connected, command DM-TL pump ON via scan tool and observe live pump current and voltage. Record values. If pump does not run and voltage is present, suspect pump fault.
- If no voltage at pump connector when commanded, check related fuses, relays, and continuity back to module. Repair wiring or replace relay/fuse as required.
- If voltage present but current low or zero, disconnect connector and measure pump coil resistance. If open or out-of-spec, replace pump.
- If coil resistance appears normal, bench-test pump by applying proper battery voltage briefly to confirm mechanical operation and current draw. Replace pump if abnormal.
- If pump current is excessively high when running, inspect for mechanical binding or restriction in EVAP lines/valve/canister; perform smoke test and clear blockages.
- Perform voltage drop tests on supply and ground circuits under load (while pump running) to detect high-resistance connections. Repair grounds and high-resistance splices.
- After repairs, clear codes and rerun pump plausibility/self-test cycles until monitor completes and code does not return. Check for related EVAP codes and address those as needed.
- If wiring, pump, fuses, and grounds are OK but fault persists, check for ECU/DM-TL module updates or consider module diagnostics/replacement per manufacturer guidance.
Likely causes
- Failed EVAP/tank leak detection pump (most common)
- Corroded/intermittent connector or damaged wiring between pump and module
- High resistance ground or supply (fuse, relay, chassis ground)
- Obstruction in EVAP plumbing increasing pump load
- Module failure or incorrect software/calibration
Fault status
Status
Fault stored by DM-TL module for pump current plausibility. May be set as intermittent or confirmed; MIL may be on and EVAP test inhibited until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1473
MITSUBISHI
P — Powertrain
DPF differential PRS.sensor high
Views:
UK: 6
EN: 21
RU: 8
AI status
Completed
Completed
100%
Causes
- Leaky, corroded or disconnected electrical connector at tank/EVAP pump
- Damaged or shorted wiring harness (open, short to ground/voltage, high resistance) to the DM-TL pump
- Failed or seized tank leak detection (EVAP) pump or internal motor fault
- Blocked or restricted EVAP lines, valves, or charcoal canister causing abnormal mechanical load on pump
- Low vehicle battery voltage or poor ground connection causing incorrect pump current
- Faulty DM-TL control module or engine control module (ECU) calibration/software error
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated for EVAP/DM-TL fault
- EVAP leak test cannot be completed or monitor reports failed/incomplete
- Possible fuel smell from vehicle if EVAP path compromised
- No drivability symptoms in many cases, though pump may be noisy or silent when commanded
- Vehicle may fail emissions readiness/self-test
What to check
- Read DTCs and freeze-frame data with a capable BMW scan tool; note operating conditions when code set
- Check live data: commanded DM-TL pump on/off, pump current, pump voltage, module status and any related EVAP codes
- Visually inspect connectors and wiring at the tank/EVAP pump and DM-TL module for corrosion, damage, pin backout, or moisture
- Check fuse(s) and relay(s) supplying the pump and module
- Measure supply voltage to pump connector with pump commanded ON (should be near battery voltage ~11–14.5 V)
- Measure pump current with a DC clamp ammeter while the pump is commanded; compare to expected range
Signal parameters
- Expected pump supply voltage (commanded ON): approx. battery voltage 11–14.5 V (varies by vehicle)
- Pump current while running: commonly in the range of ~0.3–3.0 A depending on pump design — large deviations (near 0 A or >5–8 A) indicate fault
- Pump coil resistance (cold, connector removed): typically low ohms (example 5–30 Ω) — open or shorted coil out of range
- Supply continuity:
- Ground voltage drop under load:
Diagnostic algorithm
- Connect BMW-capable scan tool, confirm P1473 and note freeze-frame/live data (pump command state, pump current, supply voltage).
- Visually inspect EVAP pump connector, wiring harness, and module connectors for corrosion, damage, moisture, or pin issues. Repair as needed.
- With connector connected, command DM-TL pump ON via scan tool and observe live pump current and voltage. Record values. If pump does not run and voltage is present, suspect pump fault.
- If no voltage at pump connector when commanded, check related fuses, relays, and continuity back to module. Repair wiring or replace relay/fuse as required.
- If voltage present but current low or zero, disconnect connector and measure pump coil resistance. If open or out-of-spec, replace pump.
- If coil resistance appears normal, bench-test pump by applying proper battery voltage briefly to confirm mechanical operation and current draw. Replace pump if abnormal.
- If pump current is excessively high when running, inspect for mechanical binding or restriction in EVAP lines/valve/canister; perform smoke test and clear blockages.
- Perform voltage drop tests on supply and ground circuits under load (while pump running) to detect high-resistance connections. Repair grounds and high-resistance splices.
- After repairs, clear codes and rerun pump plausibility/self-test cycles until monitor completes and code does not return. Check for related EVAP codes and address those as needed.
- If wiring, pump, fuses, and grounds are OK but fault persists, check for ECU/DM-TL module updates or consider module diagnostics/replacement per manufacturer guidance.
Likely causes
- Failed EVAP/tank leak detection pump (most common)
- Corroded/intermittent connector or damaged wiring between pump and module
- High resistance ground or supply (fuse, relay, chassis ground)
- Obstruction in EVAP plumbing increasing pump load
- Module failure or incorrect software/calibration
Fault status
Status
Fault stored by DM-TL module for pump current plausibility. May be set as intermittent or confirmed; MIL may be on and EVAP test inhibited until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1473
Other
P — Powertrain
Fan Secondary High With Fan(s) Off
Views:
UK: 18
EN: 39
RU: 23
AI status
Completed
Completed
100%
Causes
- Leaky, corroded or disconnected electrical connector at tank/EVAP pump
- Damaged or shorted wiring harness (open, short to ground/voltage, high resistance) to the DM-TL pump
- Failed or seized tank leak detection (EVAP) pump or internal motor fault
- Blocked or restricted EVAP lines, valves, or charcoal canister causing abnormal mechanical load on pump
- Low vehicle battery voltage or poor ground connection causing incorrect pump current
- Faulty DM-TL control module or engine control module (ECU) calibration/software error
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated for EVAP/DM-TL fault
- EVAP leak test cannot be completed or monitor reports failed/incomplete
- Possible fuel smell from vehicle if EVAP path compromised
- No drivability symptoms in many cases, though pump may be noisy or silent when commanded
- Vehicle may fail emissions readiness/self-test
What to check
- Read DTCs and freeze-frame data with a capable BMW scan tool; note operating conditions when code set
- Check live data: commanded DM-TL pump on/off, pump current, pump voltage, module status and any related EVAP codes
- Visually inspect connectors and wiring at the tank/EVAP pump and DM-TL module for corrosion, damage, pin backout, or moisture
- Check fuse(s) and relay(s) supplying the pump and module
- Measure supply voltage to pump connector with pump commanded ON (should be near battery voltage ~11–14.5 V)
- Measure pump current with a DC clamp ammeter while the pump is commanded; compare to expected range
Signal parameters
- Expected pump supply voltage (commanded ON): approx. battery voltage 11–14.5 V (varies by vehicle)
- Pump current while running: commonly in the range of ~0.3–3.0 A depending on pump design — large deviations (near 0 A or >5–8 A) indicate fault
- Pump coil resistance (cold, connector removed): typically low ohms (example 5–30 Ω) — open or shorted coil out of range
- Supply continuity:
- Ground voltage drop under load:
Diagnostic algorithm
- Connect BMW-capable scan tool, confirm P1473 and note freeze-frame/live data (pump command state, pump current, supply voltage).
- Visually inspect EVAP pump connector, wiring harness, and module connectors for corrosion, damage, moisture, or pin issues. Repair as needed.
- With connector connected, command DM-TL pump ON via scan tool and observe live pump current and voltage. Record values. If pump does not run and voltage is present, suspect pump fault.
- If no voltage at pump connector when commanded, check related fuses, relays, and continuity back to module. Repair wiring or replace relay/fuse as required.
- If voltage present but current low or zero, disconnect connector and measure pump coil resistance. If open or out-of-spec, replace pump.
- If coil resistance appears normal, bench-test pump by applying proper battery voltage briefly to confirm mechanical operation and current draw. Replace pump if abnormal.
- If pump current is excessively high when running, inspect for mechanical binding or restriction in EVAP lines/valve/canister; perform smoke test and clear blockages.
- Perform voltage drop tests on supply and ground circuits under load (while pump running) to detect high-resistance connections. Repair grounds and high-resistance splices.
- After repairs, clear codes and rerun pump plausibility/self-test cycles until monitor completes and code does not return. Check for related EVAP codes and address those as needed.
- If wiring, pump, fuses, and grounds are OK but fault persists, check for ECU/DM-TL module updates or consider module diagnostics/replacement per manufacturer guidance.
Likely causes
- Failed EVAP/tank leak detection pump (most common)
- Corroded/intermittent connector or damaged wiring between pump and module
- High resistance ground or supply (fuse, relay, chassis ground)
- Obstruction in EVAP plumbing increasing pump load
- Module failure or incorrect software/calibration
Fault status
Status
Fault stored by DM-TL module for pump current plausibility. May be set as intermittent or confirmed; MIL may be on and EVAP test inhibited until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1473
RAM
P — Powertrain
Leak Detect Pump Solenoid Circuit High
Views:
UK: 4
EN: 7
RU: 7
AI status
Completed
Completed
100%
Causes
- Leaky, corroded or disconnected electrical connector at tank/EVAP pump
- Damaged or shorted wiring harness (open, short to ground/voltage, high resistance) to the DM-TL pump
- Failed or seized tank leak detection (EVAP) pump or internal motor fault
- Blocked or restricted EVAP lines, valves, or charcoal canister causing abnormal mechanical load on pump
- Low vehicle battery voltage or poor ground connection causing incorrect pump current
- Faulty DM-TL control module or engine control module (ECU) calibration/software error
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated for EVAP/DM-TL fault
- EVAP leak test cannot be completed or monitor reports failed/incomplete
- Possible fuel smell from vehicle if EVAP path compromised
- No drivability symptoms in many cases, though pump may be noisy or silent when commanded
- Vehicle may fail emissions readiness/self-test
What to check
- Read DTCs and freeze-frame data with a capable BMW scan tool; note operating conditions when code set
- Check live data: commanded DM-TL pump on/off, pump current, pump voltage, module status and any related EVAP codes
- Visually inspect connectors and wiring at the tank/EVAP pump and DM-TL module for corrosion, damage, pin backout, or moisture
- Check fuse(s) and relay(s) supplying the pump and module
- Measure supply voltage to pump connector with pump commanded ON (should be near battery voltage ~11–14.5 V)
- Measure pump current with a DC clamp ammeter while the pump is commanded; compare to expected range
Signal parameters
- Expected pump supply voltage (commanded ON): approx. battery voltage 11–14.5 V (varies by vehicle)
- Pump current while running: commonly in the range of ~0.3–3.0 A depending on pump design — large deviations (near 0 A or >5–8 A) indicate fault
- Pump coil resistance (cold, connector removed): typically low ohms (example 5–30 Ω) — open or shorted coil out of range
- Supply continuity:
- Ground voltage drop under load:
Diagnostic algorithm
- Connect BMW-capable scan tool, confirm P1473 and note freeze-frame/live data (pump command state, pump current, supply voltage).
- Visually inspect EVAP pump connector, wiring harness, and module connectors for corrosion, damage, moisture, or pin issues. Repair as needed.
- With connector connected, command DM-TL pump ON via scan tool and observe live pump current and voltage. Record values. If pump does not run and voltage is present, suspect pump fault.
- If no voltage at pump connector when commanded, check related fuses, relays, and continuity back to module. Repair wiring or replace relay/fuse as required.
- If voltage present but current low or zero, disconnect connector and measure pump coil resistance. If open or out-of-spec, replace pump.
- If coil resistance appears normal, bench-test pump by applying proper battery voltage briefly to confirm mechanical operation and current draw. Replace pump if abnormal.
- If pump current is excessively high when running, inspect for mechanical binding or restriction in EVAP lines/valve/canister; perform smoke test and clear blockages.
- Perform voltage drop tests on supply and ground circuits under load (while pump running) to detect high-resistance connections. Repair grounds and high-resistance splices.
- After repairs, clear codes and rerun pump plausibility/self-test cycles until monitor completes and code does not return. Check for related EVAP codes and address those as needed.
- If wiring, pump, fuses, and grounds are OK but fault persists, check for ECU/DM-TL module updates or consider module diagnostics/replacement per manufacturer guidance.
Likely causes
- Failed EVAP/tank leak detection pump (most common)
- Corroded/intermittent connector or damaged wiring between pump and module
- High resistance ground or supply (fuse, relay, chassis ground)
- Obstruction in EVAP plumbing increasing pump load
- Module failure or incorrect software/calibration
Fault status
Status
Fault stored by DM-TL module for pump current plausibility. May be set as intermittent or confirmed; MIL may be on and EVAP test inhibited until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1473
VOLKSWAGEN
P — Powertrain
EVAP Emission Control System LDP Open Circuit
Views:
UK: 18
EN: 47
RU: 21
AI status
Completed
Completed
100%
Causes
- Leaky, corroded or disconnected electrical connector at tank/EVAP pump
- Damaged or shorted wiring harness (open, short to ground/voltage, high resistance) to the DM-TL pump
- Failed or seized tank leak detection (EVAP) pump or internal motor fault
- Blocked or restricted EVAP lines, valves, or charcoal canister causing abnormal mechanical load on pump
- Low vehicle battery voltage or poor ground connection causing incorrect pump current
- Faulty DM-TL control module or engine control module (ECU) calibration/software error
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated for EVAP/DM-TL fault
- EVAP leak test cannot be completed or monitor reports failed/incomplete
- Possible fuel smell from vehicle if EVAP path compromised
- No drivability symptoms in many cases, though pump may be noisy or silent when commanded
- Vehicle may fail emissions readiness/self-test
What to check
- Read DTCs and freeze-frame data with a capable BMW scan tool; note operating conditions when code set
- Check live data: commanded DM-TL pump on/off, pump current, pump voltage, module status and any related EVAP codes
- Visually inspect connectors and wiring at the tank/EVAP pump and DM-TL module for corrosion, damage, pin backout, or moisture
- Check fuse(s) and relay(s) supplying the pump and module
- Measure supply voltage to pump connector with pump commanded ON (should be near battery voltage ~11–14.5 V)
- Measure pump current with a DC clamp ammeter while the pump is commanded; compare to expected range
Signal parameters
- Expected pump supply voltage (commanded ON): approx. battery voltage 11–14.5 V (varies by vehicle)
- Pump current while running: commonly in the range of ~0.3–3.0 A depending on pump design — large deviations (near 0 A or >5–8 A) indicate fault
- Pump coil resistance (cold, connector removed): typically low ohms (example 5–30 Ω) — open or shorted coil out of range
- Supply continuity:
- Ground voltage drop under load:
Diagnostic algorithm
- Connect BMW-capable scan tool, confirm P1473 and note freeze-frame/live data (pump command state, pump current, supply voltage).
- Visually inspect EVAP pump connector, wiring harness, and module connectors for corrosion, damage, moisture, or pin issues. Repair as needed.
- With connector connected, command DM-TL pump ON via scan tool and observe live pump current and voltage. Record values. If pump does not run and voltage is present, suspect pump fault.
- If no voltage at pump connector when commanded, check related fuses, relays, and continuity back to module. Repair wiring or replace relay/fuse as required.
- If voltage present but current low or zero, disconnect connector and measure pump coil resistance. If open or out-of-spec, replace pump.
- If coil resistance appears normal, bench-test pump by applying proper battery voltage briefly to confirm mechanical operation and current draw. Replace pump if abnormal.
- If pump current is excessively high when running, inspect for mechanical binding or restriction in EVAP lines/valve/canister; perform smoke test and clear blockages.
- Perform voltage drop tests on supply and ground circuits under load (while pump running) to detect high-resistance connections. Repair grounds and high-resistance splices.
- After repairs, clear codes and rerun pump plausibility/self-test cycles until monitor completes and code does not return. Check for related EVAP codes and address those as needed.
- If wiring, pump, fuses, and grounds are OK but fault persists, check for ECU/DM-TL module updates or consider module diagnostics/replacement per manufacturer guidance.
Likely causes
- Failed EVAP/tank leak detection pump (most common)
- Corroded/intermittent connector or damaged wiring between pump and module
- High resistance ground or supply (fuse, relay, chassis ground)
- Obstruction in EVAP plumbing increasing pump load
- Module failure or incorrect software/calibration
Fault status
Status
Fault stored by DM-TL module for pump current plausibility. May be set as intermittent or confirmed; MIL may be on and EVAP test inhibited until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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