DTC Diagnosis Procedure
- 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.
+
-
Voltage
ECM
Connector
Terminal
F54
19
Ground
Battery voltage
Is the inspection result normal?
YES
GO TO 3.
NO
GO TO 2.
- CHECK FUEL PUMP POWER SUPPLY CIRCUIT-2
Check the voltage between IPDM E/R harness connector and ground.
+
-
Voltage
IPDM E/R
Connector
Terminal
E122
46
Ground
Battery voltage
Is the inspection result normal?
YES
Repair or replace error-detected parts.
NO
GO TO 8.
- CHECK FUEL PUMP POWER SUPPLY CIRCUIT-3
- Turn ignition switch OFF.
- Reconnect all harness connectors disconnected.
- Disconnect "fuel level sensor unit and fuel pump" harness connector.
- Turn ignition switch ON.
- Check the voltage between "fuel level sensor unit and fuel pump" harness connector and ground.
+
-
Voltage
Fuel level sensor unit and fuel pump
Connector
Terminal
C5
1
Ground
Battery voltage should exist for 1 second after ignition switch is turned ON.
Is the inspection result normal?
YES
GO TO 6.
NO
GO TO 4.
- CHECK 15A FUSE
- Turn ignition switch OFF.
- Disconnect 15A fuse (No. 48) from IPDM E/R.
- Check 15 A fuse.
Is the inspection result normal?
YES
GO TO 5.
NO
Replace fuse.
- CHECK FUEL PUMP POWER SUPPLY CIRCUIT-4
- Disconnect IPDM E/R harness connector.
- Check the continuity between IPDM E/R harness connector and "fuel level sensor unit and fuel pump" harness connector.
+
-
Continuity
IPDM E/R
Fuel level sensor unit and fuel pump
Connector
Terminal
Connector
Terminal
E119
13
C5
1
Existed
- 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.
- CHECK FUEL PUMP GROUND CIRCUIT
- Turn ignition switch OFF.
- Check the continuity between "fuel level sensor unit and fuel pump" harness connector and ground.
+
-
Continuity
Fuel level sensor unit and fuel pump
Connector
Terminal
C5
3
Ground
Existed
- Also check harness for short to power.
Is the inspection result normal?
YES
GO TO 7.
NO
Repair or replace error-detected parts.
- CHECK FUEL PUMP
Refer to Component Inspection .
Is the inspection result normal?
YES
GO TO 8.
NO
Replace fuel pump. Refer to Removal and Installation - VQ40DE .
- CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident .
Is the inspection result normal?
YES
Replace IPDM E/R. Refer to Removal and Installation .
NO
Repair or replace error-detected parts.