Diagnosis Procedure
- CHECK FUSE
- Turn ignition switch OFF.
- Check that the following fuse is not blowing.
Fuse No.
Capacity
#78
15A
#79
15A
#80
15A
Is the fuse blown (open)?
YES
Replace the fuse after repairing the applicable circuit.
NO
GO TO 2.
- CHECK FUEL INJECTOR DRIVER POWER SUPPLY
- 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
F78
3
Ground
Battery voltage
4
5
6
Is the inspection result normal?
YES
GO TO 9.
NO
GO TO 3.
- CHECK FUEL INJECTOR DRIVER POWER SUPPLY CIRCUIT
- Remove fuel injector relay.
- Check the continuity between ECM harness connector and fuel injector relay harness connector.
ECM
Fuel injector relay
Continuity
Connector
Terminal
Connector
Terminal
F78
3
E20
5
Existed
5
4
7
6
- Also check harness for short to ground.
Is the inspection result normal?
YES
GO TO 4.
NO
Repair or replace error-detected parts
- CHECK FUEL INJECTOR RELAY POWER SUPPLY (CONTACTOR SIDE)
Check the voltage between fuel injector relay harness connector and ground.
+
-
Voltage
Fuel injector relay
Connector
Terminal
E20
3
Ground
Battery voltage
6
Is the inspection result normal?
YES
GO TO 5.
NO
Perform the trouble diagnosis for power supply circuit.
- CHECK FUEL INJECTOR RELAY POWER SUPPLY (COIL SIDE)
- Reconnect ECM harness connector.
- Turn ignition switch ON.
- Check the voltage between fuel injector relay harness connector and ground.
+
-
Voltage
Fuel injector relay
Connector
Terminal
E20
1
Ground
Battery voltage
Is the inspection result normal?
YES
GO TO 7.
NO
GO TO 6.
- CHECK FUEL INJECTOR RELAY POWER SUPPLY CIRCUIT (COIL SIDE)
- Turn ignition switch OFF.
- Disconnect IPDM E/R harness connector.
- Check the continuity between IPDM E/R harness connector and fuel injector harness connector.
IPDM E/R
Fuel injector relay
Continuity
Connector
Terminal
Connector
Terminal
F19
59
E20
1
Existed
- Also check harness for short to ground.
Is the inspection result normal?
YES
Perform the trouble diagnosis for power supply circuit.
NO
Repair or replace error-detected parts.
- CHECK FUEL INJECTOR RELAY GROUND CIRCUIT
- Turn ignition switch OFF.
- Check the continuity between fuel injector relay harness connector and ground.
Fuel injector relay
--
Continuity
Connector
Terminal
E20
2
Ground
Existed
- Also check harness for short to power.
Is the inspection result normal?
YES
GO TO 8.
NO
Repair or replace error-detected parts.
- CHECK FUEL INJECTOR RELAY
Check the fuel injector relay. Refer to Component Inspection (Fuel Injector Relay) .
Is the inspection result normal?
YES
Check intermittent incident. Refer to Intermittent Incident .
NO
Replace fuel injector relay.
- CHECK ECM GROUND CIRCUIT
- Disconnect ECM harness connectors.
- Check the continuity between ECM harness connector and ground.
ECM
--
Continuity
Connector
Terminal
F78
2
Ground
Existed
7
F79
87
88
95
E32
199
201
204
- Also check harness for short to power.
Is the inspection result normal?
YES
GO TO 10.
NO
Repair or replace error-detected parts.
- CHECK FUEL INJECTOR CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between fuel injector harness connector and ECM harness connector.
Fuel injector
ECM
Continuity
Cylinder
Connector
Terminal
Connector
Terminal
1
F352
1
F78
11
Existed
2
17
2
F302
1
15
2
20
3
F353
1
12
2
14
4
F303
1
16
2
21
5
F354
1
13
2
18
6
F304
1
19
2
22
- Also check harness for short to power and short to ground.
Is the inspection result normal?
YES
GO TO 11.
NO
Repair or replace error-detected parts.
- CHECK FUEL INJECTOR
Check fuel injector. Refer to Component Inspection (Fuel Injector) .
Is the inspection result normal?
YES
Check intermittent incident. Refer to Intermittent Incident .
NO
Replace malfunctioning fuel injector. Refer to Exploded View .