Diagnosis Procedure

FUEL PUMP


Diagnosis Procedure

1.CHECK OVERALL 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.

OK or NG
OK INSPECTION END
NG - GO TO 2.
2.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Turn ignition switch ON.





4. Check voltage between ECM terminal 113 and ground with
CONSULT-III or tester.

Voltage: Battery voltage

OK or NG
OK - GO TO 5.
NG - GO TO 3.
3.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II





Check voltage between IPDM E/R terminal 40 and ground with
CONSULT-III or tester.

Voltage: Battery voltage

OK or NG
OK - GO TO 4.
NG - GO TO 11.
4.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E108, M15
- Harness for open or short between IPDM E/R and ECM
Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK FUEL PUMP POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.





3. Disconnect "fuel level sensor unit and fuel pump" harness connector (1).
- Illustration shows the view with rear seat cushion and inspection hole cover (RH) removed.
- : Vehicle front
4. Turn ignition switch ON.
5. Check voltage between "fuel level sensor unit and fuel pump" terminal 1 and ground with CONSULT-III or tester.

Voltage: Battery voltage should exist for 1 second after ignition switch is turned ON

OK or NG
OK - GO TO 7.
NG - GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E106, B4
- Harness connectors B65, B434
- IPDM E/R connector E8
- 15 A fuse
- Harness for open or short between IPDM E/R and condenser
Repair open circuit or short to ground or short to power in harness or connectors.
7.CHECK FUEL PUMP GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect dropping resistor harness connector.





3. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 3 and dropping resistor terminal 2, dropping resistor terminal 1 and ground. Refer to Wiring Diagram.

Continuity should exist.

4. Also check harness for short to ground and short to power.
OK or NG
OK - GO TO 9.
NG - GO TO 8.
8.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B65, B434
- Harness for open or short between "fuel level sensor unit and fuel pump" and dropping resistor
- Harness for open or short between dropping resistor and ground
Repair open circuit or short to ground or short to power in harness or connectors.
9.CHECK DROPPING RESISTOR
Refer to Component Inspection.
OK or NG
OK - GO TO 10.
NG - Replace dropping resistor.
10.CHECK FUEL PUMP
Refer to Component Inspection.
OK or NG
OK - GO TO 11.
NG - Replace fuel pump.
11.CHECK INTERMITTENT INCIDENT
Refer to Diagnosis Procedure.
OK or NG
OK - Replace IPDM E/R.
NG - Repair or replace harness or connectors.