Code
P2405
Generic
P — Powertrain
EVAP System Leak Detection Pump Sense Circuit Low
Views:
UK: 10
EN: 23
RU: 16
AI status
Completed
Completed
100%
Causes
- Open, short-to-ground, or high-resistance wiring in the LDP sense circuit
- Corroded, damaged or loose connector at the leak detection pump
- Failed leak detection pump (internal short, open or stalled motor)
- Blown fuse or failed relay supplying pump motor
- Poor battery/ground connection at pump or chassis ground
- PCM input or internal electronics fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Stored P2405 code and EVAP system monitor not completing
- Possible failed emissions test or EVAP system warning
- In some vehicles, inability to run EVAP leak test or drivability concerns are rare
What to check
- Verify MIL is on and retrieve freeze-frame and related EVAP codes
- Visually inspect pump, wiring, and connector for corrosion, damage, pin push-out, or moisture
- Check fuse(s) and relay(s) for the EVAP pump circuit
- Backprobe pump connector and measure supply voltage and sense line with key ON and while commanded on by scanner
- Measure resistance of the pump motor and compare to specification (typical low ohms); check for short to ground on sense wire
- Wiggle harness/connectors while monitoring signal to reproduce intermittent faults
Signal parameters
- Supply voltage to pump motor: about battery voltage (approx. 11–14 V) when key ON/engine OFF or when commanded ON; exact spec varies by vehicle
- Sense circuit: expected to change state when pump is commanded; should not be held low (near 0 V) at rest unless specified by manufacturer
- Pump motor resistance: typically low (roughly 1–50 ohms depending on pump design) — check service data
- Pump current draw when running: commonly between 0.5–5 A depending on pump size; excessively high or zero indicates fault
- If PCM uses PWM for control, duty cycle/frequency will vary by vehicle (compare to factory data)
Diagnostic algorithm
- Read and record all EVAP and related codes; note freeze-frame data and pending codes.
- Perform a visual inspection: check harness routing, chafe points, connector corrosion, water intrusion, and grounding points at the pump.
- Check EVAP pump fuse(s) and relay(s). Replace if blown or faulty and re-test.
- With connector accessible, backprobe the pump connector. With ignition ON, measure battery feed and sense line voltage. With a scanner, command the pump ON and observe changes.
- If supply voltage is absent, trace power feed back to fuse/relay and repair open circuit. If supply present but pump does not run when commanded, apply direct 12 V to the pump motor to confirm pump operation.
- Measure resistance across the pump motor. Open or infinite resistance indicates motor open; very low or near short indicates internal fault. Measure current draw when powered; compare to specification.
- Check continuity of the sense circuit to the PCM and inspect for short to ground. Repair any damaged wiring, replace corroded connectors, and secure grounds.
- If wiring and pump test good, check PCM input for proper pull-up/pull-down and reference voltages per factory procedure; consider PCM replacement only after confirming external faults are resolved.
- After repairs, clear codes and perform EVAP monitor or sealed system leak test (smoke test) to confirm system integrity and that code does not return.
Likely causes
- Corroded/damaged connector at pump or harness chafe causing short to ground
- Failed leak detection pump motor drawing abnormal current or presenting incorrect impedance
- Missing power or blown fuse/failed relay to the pump circuit
- Open or shorted sense wire between pump and PCM
- Faulty PCM (less common) after other causes ruled out
Fault status
Status
PCM detected a low voltage condition on the EVAP Leak Detection Pump sense circuit indicating possible open/short, pump failure, wiring/connector fault, blown fuse, or PCM input issue.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P2405
LAND ROVER
P — Powertrain
pump direction of the leak detection system by evaporative system low circuit
Views:
UK: 7
EN: 10
RU: 4
AI status
Completed
Completed
100%
Causes
- Open, short-to-ground, or high-resistance wiring in the LDP sense circuit
- Corroded, damaged or loose connector at the leak detection pump
- Failed leak detection pump (internal short, open or stalled motor)
- Blown fuse or failed relay supplying pump motor
- Poor battery/ground connection at pump or chassis ground
- PCM input or internal electronics fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Stored P2405 code and EVAP system monitor not completing
- Possible failed emissions test or EVAP system warning
- In some vehicles, inability to run EVAP leak test or drivability concerns are rare
What to check
- Verify MIL is on and retrieve freeze-frame and related EVAP codes
- Visually inspect pump, wiring, and connector for corrosion, damage, pin push-out, or moisture
- Check fuse(s) and relay(s) for the EVAP pump circuit
- Backprobe pump connector and measure supply voltage and sense line with key ON and while commanded on by scanner
- Measure resistance of the pump motor and compare to specification (typical low ohms); check for short to ground on sense wire
- Wiggle harness/connectors while monitoring signal to reproduce intermittent faults
Signal parameters
- Supply voltage to pump motor: about battery voltage (approx. 11–14 V) when key ON/engine OFF or when commanded ON; exact spec varies by vehicle
- Sense circuit: expected to change state when pump is commanded; should not be held low (near 0 V) at rest unless specified by manufacturer
- Pump motor resistance: typically low (roughly 1–50 ohms depending on pump design) — check service data
- Pump current draw when running: commonly between 0.5–5 A depending on pump size; excessively high or zero indicates fault
- If PCM uses PWM for control, duty cycle/frequency will vary by vehicle (compare to factory data)
Diagnostic algorithm
- Read and record all EVAP and related codes; note freeze-frame data and pending codes.
- Perform a visual inspection: check harness routing, chafe points, connector corrosion, water intrusion, and grounding points at the pump.
- Check EVAP pump fuse(s) and relay(s). Replace if blown or faulty and re-test.
- With connector accessible, backprobe the pump connector. With ignition ON, measure battery feed and sense line voltage. With a scanner, command the pump ON and observe changes.
- If supply voltage is absent, trace power feed back to fuse/relay and repair open circuit. If supply present but pump does not run when commanded, apply direct 12 V to the pump motor to confirm pump operation.
- Measure resistance across the pump motor. Open or infinite resistance indicates motor open; very low or near short indicates internal fault. Measure current draw when powered; compare to specification.
- Check continuity of the sense circuit to the PCM and inspect for short to ground. Repair any damaged wiring, replace corroded connectors, and secure grounds.
- If wiring and pump test good, check PCM input for proper pull-up/pull-down and reference voltages per factory procedure; consider PCM replacement only after confirming external faults are resolved.
- After repairs, clear codes and perform EVAP monitor or sealed system leak test (smoke test) to confirm system integrity and that code does not return.
Likely causes
- Corroded/damaged connector at pump or harness chafe causing short to ground
- Failed leak detection pump motor drawing abnormal current or presenting incorrect impedance
- Missing power or blown fuse/failed relay to the pump circuit
- Open or shorted sense wire between pump and PCM
- Faulty PCM (less common) after other causes ruled out
Fault status
Status
PCM detected a low voltage condition on the EVAP Leak Detection Pump sense circuit indicating possible open/short, pump failure, wiring/connector fault, blown fuse, or PCM input issue.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Workshop Manual199,00 UAH
Your experience will help others
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Was this AI description helpful?
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