Nissan Sentra Service Manual: Fuel pump
Component Function Check
1.CHECK FUEL PUMP FUNCTION
- Turn ignition switch ON.
- Pinch fuel feed hose
with
two fingers.
Fuel pressure pulsation should be felt on the fuel feed hose for 1 second after ignition switch is turned ON.
Is the inspection result normal? YES >> INSPECTION END
NO >> Proceed to EC-453, "Diagnosis Procedure".
Diagnosis Procedure
1.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-1
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Turn ignition switch ON.
- Check the voltage between ECM harness connector and ground.
Is the inspection result normal? YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-2
- Turn ignition switch OFF.
- Disconnect IPDM E/R harness connector.
- Check the continuity between IPDM E/R harness connector and ECM harness connector.
- Also check harness for short to ground and short to power.
Is the inspection result normal? YES >> GO TO 8.
NO >> Repair or replace error-detected parts.
3.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-3
- Turn ignition switch OFF.
- Reconnect all harness connectors disconnected.
- Disconnect fuel pump harness connector.
- Turn ignition switch ON.
- Check the voltage between fuel pump harness connector and ground.
Is the inspection result normal? YES >> GO TO 6.
NO >> GO TO 4.
4.CHECK FUSE
- Turn ignition switch OFF.
- Disconnect 15A fuse (No. 50) from IPDM E/R.
- Check 15A fuse.
Is the inspection result normal? YES >> GO TO 5.
NO >> Replace 15A fuse.
5.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-4
- Turn ignition switch OFF.
- Disconnect IPDM E/R harness connector
- Check the continuity between IPDM E/R harness connector and fuel pump harness connector.
- Also check harness for short to ground and short to power.
Is the inspection result normal? YES >> GO TO 6.
NO >> Repair or replace error-detected parts.
6.CHECK FUEL PUMP GROUND CIRCUIT
- Turn ignition switch OFF.
- Check the continuity between fuel pump harness connector and ground.
- Also check harness for short to power.
Is the inspection result normal? YES >> GO TO 7.
NO >> Repair or replace error-detected parts.
7.CHECK FUEL PUMP
Check fuel pump. Refer to EC-455, "Component Inspection (Fuel Pump)".
Is the inspection result normal? YES >> GO TO 8.
NO >> Replace fuel filter and fuel pump. Refer to FL-6, "Exploded View".
8.CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to GI-39, "Intermittent Incident".
Is the inspection result normal? YES >> Replace IPDM E/R. Refer to PCS-30, "Removal and Installation" (With intelligent key) or PCS-58, "Removal and Installation" (Without intelligent key).
NO >> Repair or replace error-detected parts.
Component Inspection (Fuel Pump)
1.CHECK FUEL PUMP
- Turn ignition switch OFF
- Disconnect fuel level sensor unit and fuel pump harness connector.
- Check resistance between fuel pump terminals as follows.
Is the inspection result normal? YES >> INSPECTION END
NO >> Replace fuel filter and fuel pump. Refer to FL-6, "Removal and Installation".
Fuel injector
Component Function Check
1.INSPECTION START
Turn ignition switch to START.
Is any cylinder ignited?
YES >> GO TO 2.
NO >> Proceed to EC-450, "Diagnosis Procedure".
2.CH ...
Ignition signal
Component Function Check
1.INSPECTION START
Turn ignition switch OFF.
Start engine.
Does the engine start?
YES >> GO TO 2.
NO >> Proceed to EC-456, "Diagnosis Procedure& ...
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