Fuel Pump: Testing and Inspection

FUEL PUMP

Component Function Check


1. CHECK FUEL PUMP FUNCTION

1.Turn ignition switch ON.





2.Pinch fuel feed hose (1) 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-.


Diagnosis Procedure


1. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Turn ignition switch ON.
4.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-II

1.Turn ignition switch OFF.
2.Disconnect IPDM E/R harness connector.
3.Check the continuity between IPDM E/R harness connector and ECM harness connector.





4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 8.
NO- Repair open circuit or short to ground or short to power in harness or connectors.

3. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III

1.Turn ignition switch OFF.
2.Reconnect all harness connectors disconnected.
3.Disconnect "fuel level sensor unit and fuel pump" harness connector.
4.Turn ignition switch ON.
5.Check the voltage between "fuel level sensor unit and fuel pump" harness connector and ground.





Is the inspection result normal?
YES- GO TO 6.
NO- GO TO 4.

4. CHECK FUSE

1.Turn ignition switch OFF.
2.Disconnect 15 A fuse (No. 48) from IPDM E/R.
3.Check 15 A fuse.
Is the inspection result normal?
YES- GO TO 5.
NO- Replace 15 A fuse.

5. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-IV

1.Turn ignition switch OFF.
2.Disconnect IPDM E/R harness connector.
3.Check the continuity between IPDM E/R harness connector and "fuel level sensor unit and fuel pump"
harness connector.





4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 6.
NO- Repair open circuit, short to ground or short to power in harness or connectors.

6. CHECK FUEL PUMP GROUND CIRCUIT FOR OPEN AND SHORT

1.Turn ignition switch OFF.
2.Check the continuity between "fuel level sensor unit and fuel pump" harness connector and ground.





3.Also check harness for short to power.
Is the inspection result normal?
YES- GO TO 7.
NO- Repair open circuit or short to power in harness or connectors.

7. CHECK FUEL PUMP

.
Is the inspection result normal?
YES- GO TO 8.
NO- Replace "fuel level sensor unit and fuel pump".Exploded View.

8. CHECK INTERMITTENT INCIDENT

Check intermittent incident. Intermittent Incident.
Is the inspection result normal?
YES- Replace IPDM E/R. Service and Repair.
NO- Repair open circuit, short to ground or short to power in harness or connectors.


Component Inspection


1. CHECK FUEL PUMP

1.Turn ignition switch OFF.
2.Disconnect "fuel level sensor unit and fuel pump" harness connector.
3.Check resistance between "fuel level sensor unit and fuel pump" terminals as follows.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace "fuel level sensor unit and fuel pump". Exploded View.