DTC 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
F230
1
Ground
Battery voltage
2
F234
1
3
F231
1
4
F235
1
5
F232
1
6
F236
1
7
F233
1
8
F237
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
F230
1
F78
47
Existed
2
F234
1
5
3
F231
1
4
F235
1
54
5
F232
1
7
6
F236
1
47
7
F233
1
54
8
F237
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
F78
1
Ground
Battery voltage
2
6
46
Is the inspection result normal?
YES
Check intermittent incident. Refer to Intermittent Incident
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
F78
1
E173
3
Existed
6
3
- Check the continuity between ECM harness connector and high pressure fuel pump and fuel injector relay harness connector.
ECM
High pressure fuel pump and Fuel injector relay
Continuity
Connector
Terminal
Connector
Terminal
F78
2
E172
6
Existed
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
E173
5
Ground
Battery voltage
- Check the voltage between high pressure fuel pump and fuel injector relay harness connector and ground.
+
-
Voltage
High pressure fuel pump and Fuel injector relay
Connector
Terminal
E172
7
Ground
Battery voltage
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
E173
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
E121
3
E173
2
Existed
- Check the continuity between IPDM E/R harness connector and high pressure fuel pump and fuel injector harness connector.
IPDM E/R
High pressure fuel pump and Fuel injector relay
Continuity
Connector
Terminal
Connector
Terminal
E121
3
E172
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
E173
1
Ground
Existed
- Check the continuity between high pressure fuel pump and fuel injector relay harness connector and ground.
High pressure fuel pump and Fuel injector relay
-
Continuity
Connector
Terminal
E172
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
F230
2
F78
48
Existed
2
F234
2
9
3
F231
2
4
4
F235
2
49
5
F232
2
8
6
F236
2
52
7
F233
2
53
8
F237
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 (Fuel Injector Relay) .
Is the inspection result normal?
YES
Check intermittent incident. Refer to Intermittent Incident
NO
Replace fuel injector relay.
- CHECK FUEL INJECTOR
Check the 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 .