Diagnosis Procedure
- CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect fuel injector harness connector.
- Turn ignition switch ON.
- Check the voltage between fuel injector harness connector and ground.
+
-
Voltage
Fuel injector
Cylinder
Connector
Terminal
1
F123
1
Ground
Battery voltage
2
F124
1
3
F125
1
4
F126
1
5
F127
1
6
F128
1
7
F129
1
8
F130
1
Is the inspection result normal?
YES
GO TO 9.
NO
GO TO 2.
- CHECK FUEL INJECTOR POWER SUPPLY 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
F123
1
F91
47
Existed
2
F124
1
5
3
F125
1
4
F126
1
54
5
F127
1
7
6
F128
1
47
7
F129
1
54
8
F130
1
7
- Also check harness for short to ground.
Is the inspection result normal?
YES
GO TO 3.
NO
Repair or replace error-detected parts.
- CHECK FUEL INJECTOR DRIVER POWER SUPPLY
- Reconnect ECM harness connector.
- Turn ignition switch ON.
- Check the voltage between ECM harness connector and ground.
+
-
Voltage
ECM
Connector
Terminal
F91
1
Ground
Battery voltage
2
6
46
Is the inspection result normal?
YES
Check intermittent incident. Refer to Inspection .
NO
GO TO 4.
- CHECK FUEL INJECTOR DRIVER POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Disconnect fuel injector relay harness connector.
- Check the continuity between ECM harness connector and fuel injector relay harness connector.
ECM
Fuel injector relay
Continuity
Connector
Terminal
Connector
Terminal
F91
1
E26
3
Existed
2
6
6
3
46
6
- Also check harness for short to ground.
Is the inspection result normal?
YES
GO TO 5.
NO
Repair or replace error-detected parts
- CHECK FUEL INJECTOR RELAY POWER SUPPLY (CONTACT SIDE)
- Turn ignition switch ON.
- Check the voltage between fuel injector relay harness connector and ground.
+
-
Voltage
Fuel injector relay
Connector
Terminal
E26
5
Ground
Battery voltage
7
Is the inspection result normal?
YES
GO TO 6.
NO
Perform the trouble diagnosis for power supply circuit.
- CHECK FUEL INJECTOR RELAY POWER SUPPLY (EXCITATION COIL SIDE)
- Reconnect all harness connectors disconnected.
- Check the voltage between fuel injector relay harness connector and ground.
+
-
Voltage
Fuel injector relay
Connector
Terminal
E26
2
Ground
Battery voltage
Is the inspection result normal?
YES
GO TO 8.
NO
GO TO 7.
- CHECK FUEL INJECTOR RELAY POWER SUPPLY CIRCUIT (EXCITATION COIL SIDE)
- Turn ignition switch OFF.
- Disconnect fuel injector relay harness connector.
- 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
E14
36
E26
2
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.
- Disconnect fuel injector relay harness connector.
- Check the continuity between fuel injector relay harness connector and ground.
Fuel injector relay
-
Continuity
Connector
Terminal
E26
1
Ground
Existed
- 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 GROUND 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
F123
2
F91
48
Existed
2
F124
2
9
3
F125
2
4
4
F126
2
49
5
F127
2
8
6
F128
2
52
7
F129
2
53
8
F130
2
3
- Also check harness for short to ground and to power.
Is the inspection result normal?
YES
GO TO 11.
NO
Repair or replace error-detected parts.
- CHECK FUEL INJECTOR RELAY
Check the fuel injector relay. Refer to Component Inspection .
Is the inspection result normal?
YES
Check intermittent incident. Refer to Inspection .
NO
Replace fuel injector relay.
- CHECK FUEL INJECTOR
Check the fuel injector. Refer to Component Inspection .
Is the inspection result normal?
YES
Check intermittent incident. Refer to Inspection .
NO
Replace malfunctioning fuel injector. Refer to FUEL INJECTOR AND FUEL TUBE : Exploded View .