Code
P0627
Generic
P — Powertrain
Fuel Pump A Control Circuit/Open
Views:
UK: 26
EN: 69
RU: 92
AI status
Completed
Completed
100%
Causes
- Open or damaged wiring in the fuel pump control circuit
- Blown fuse or faulty fuel pump relay
- Poor or corroded connector(s) at pump, relay, or module
- Failed fuel pump (open motor or internal wiring)
- Faulty fuel pump driver inside the PCM/ECM
- Bad ground for fuel pump circuit or ECM ground
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- No crank/no-start or hard starting
- Engine stalls or runs intermittently
- No audible fuel pump prime when key is turned to ON
- Low or no fuel rail pressure
What to check
- Scan for codes and note freeze frame and related codes
- Verify ignition key ON — listen for fuel pump prime
- Inspect fuses and fuel pump relay for continuity and correct operation
- Visually inspect connectors and wiring for damage, corrosion, or disconnection
- Backprobe fuel pump control and power circuits; measure voltage and continuity
- Check fuel pump ground integrity at tank and ECM ground points
Signal parameters
- Control signal: PCM typically provides a switched 0–12 V (or PWM) to pump relay or pump driver; expect near battery voltage when commanded (or a PWM waveform when applicable)
- Open-circuit condition: infinite resistance between PCM control output and pump/relay input or no voltage present when commanded
- Typical in-tank pump DC resistance: often roughly 0.2–5 ohms (varies by application) — refer to factory spec
- Typical pump current draw: roughly 4–20 A under load (application dependent) — measure with clamp meter
- Prime behavior: short key-ON prime (1–3 s) then full power when cranking — variation and frequency depend on vehicle design
Diagnostic algorithm
- Verify code and related codes with a scan tool; record freeze-frame data.
- Confirm the symptom: key ON — listen for pump prime; check fuel pressure with a gauge. If no prime and no pressure, proceed.
- Inspect fuses, fusible links and the fuel pump relay; swap with a known good relay if available and safe to do so.
- Visually inspect connectors at fuel pump module, relay and ECM for corrosion, bent pins or moisture; secure connectors.
- Backprobe the fuel pump power and control pins at the connector (or at relay output) while key ON and during cranking. Verify battery voltage on pump power feed and control signal from ECM. If power present but control absent, check relay coil feed and ECM output.
- Check continuity between ECM control pin and pump/relay control pin. Repair any open or high-resistance wiring.
- Measure pump motor DC resistance at tank; compare to spec. If open or out of range, remove and bench-test pump with direct battery power (observe current draw).
- Check ground circuits for low resistance to chassis/negative battery terminal; repair corroded or broken grounds.
- If wiring and pump test good but control signal is absent or stuck, consider ECM/PCM driver fault — confirm with manufacturer procedures before replacement.
- After repair, clear codes, verify pump operation, confirm correct fuel pressure, and perform a road test to ensure the fault does not return.
Likely causes
- Connector disconnected or corroded at fuel pump module
- Harness chafing or broken conductor between ECM and pump relay/module
- Blown in-line fuse or relay contact failure
- Failed in-tank pump motor (open winding)
- ECM output transistor/controller for pump has failed
Fault status
Status
Fuel Pump A Control Circuit/Open — The engine control module has detected an open or interrupted circuit in the fuel pump A control path. This can prevent the fuel pump from powering and cause no-start or stall conditions.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Workshop Manuals
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Code
P0627
LAND ROVER
P — Powertrain
Fuel Pump A Control - Circuit / Open
Views:
UK: 7
EN: 25
RU: 54
AI status
Completed
Completed
100%
Causes
- Open or damaged wiring in the fuel pump control circuit
- Blown fuse or faulty fuel pump relay
- Poor or corroded connector(s) at pump, relay, or module
- Failed fuel pump (open motor or internal wiring)
- Faulty fuel pump driver inside the PCM/ECM
- Bad ground for fuel pump circuit or ECM ground
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- No crank/no-start or hard starting
- Engine stalls or runs intermittently
- No audible fuel pump prime when key is turned to ON
- Low or no fuel rail pressure
What to check
- Scan for codes and note freeze frame and related codes
- Verify ignition key ON — listen for fuel pump prime
- Inspect fuses and fuel pump relay for continuity and correct operation
- Visually inspect connectors and wiring for damage, corrosion, or disconnection
- Backprobe fuel pump control and power circuits; measure voltage and continuity
- Check fuel pump ground integrity at tank and ECM ground points
Signal parameters
- Control signal: PCM typically provides a switched 0–12 V (or PWM) to pump relay or pump driver; expect near battery voltage when commanded (or a PWM waveform when applicable)
- Open-circuit condition: infinite resistance between PCM control output and pump/relay input or no voltage present when commanded
- Typical in-tank pump DC resistance: often roughly 0.2–5 ohms (varies by application) — refer to factory spec
- Typical pump current draw: roughly 4–20 A under load (application dependent) — measure with clamp meter
- Prime behavior: short key-ON prime (1–3 s) then full power when cranking — variation and frequency depend on vehicle design
Diagnostic algorithm
- Verify code and related codes with a scan tool; record freeze-frame data.
- Confirm the symptom: key ON — listen for pump prime; check fuel pressure with a gauge. If no prime and no pressure, proceed.
- Inspect fuses, fusible links and the fuel pump relay; swap with a known good relay if available and safe to do so.
- Visually inspect connectors at fuel pump module, relay and ECM for corrosion, bent pins or moisture; secure connectors.
- Backprobe the fuel pump power and control pins at the connector (or at relay output) while key ON and during cranking. Verify battery voltage on pump power feed and control signal from ECM. If power present but control absent, check relay coil feed and ECM output.
- Check continuity between ECM control pin and pump/relay control pin. Repair any open or high-resistance wiring.
- Measure pump motor DC resistance at tank; compare to spec. If open or out of range, remove and bench-test pump with direct battery power (observe current draw).
- Check ground circuits for low resistance to chassis/negative battery terminal; repair corroded or broken grounds.
- If wiring and pump test good but control signal is absent or stuck, consider ECM/PCM driver fault — confirm with manufacturer procedures before replacement.
- After repair, clear codes, verify pump operation, confirm correct fuel pressure, and perform a road test to ensure the fault does not return.
Likely causes
- Connector disconnected or corroded at fuel pump module
- Harness chafing or broken conductor between ECM and pump relay/module
- Blown in-line fuse or relay contact failure
- Failed in-tank pump motor (open winding)
- ECM output transistor/controller for pump has failed
Fault status
Status
Fuel Pump A Control Circuit/Open — The engine control module has detected an open or interrupted circuit in the fuel pump A control path. This can prevent the fuel pump from powering and cause no-start or stall conditions.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
HTML Workshop Manuals AI manual library for LAND ROVER Click to show available manuals 1
LAND ROVER 2015 Discovery Sport HSE
HTML ManualWorkshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Was this AI description helpful?
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