Diagnosis Procedure
- CHECK FUSE
Check that there is no blowout in the following fuses.
Location
Fuse No.
Capacity
IPDM E/R
#39
10 A
#42
10 A
#56
10 A
Is the fuse blown (open)?
YES
Replace the fuse after repairing the applicable circuit.
NO
GO TO 2.
- CHECK GROUND CONNECTION
- Turn ignition switch OFF.
- Check ground connection E9. Refer to Harness Layout .
Is the inspection result normal?
YES
GO TO 3.
NO
Repair or replace ground connection.
- CHECK ECM GROUND CIRCUIT
- Disconnect ECM harness connectors.
- Check the continuity between ECM harness connector and ground.
+
-
Continuity
ECM
Connector
Terminal
E10
147
Ground
Existed
149
152
F13
10
55
F14
105
110
Is the inspection result normal?
YES
GO TO 4.
NO
Repair or replace error-detected parts.
- CHECK ECM POWER SUPPLY (MAIN)-I
- Reconnect ECM harness connector.
- Turn ignition switch ON.
- Check the voltage between ECM harness connector terminals.
ECM
Voltage
Connector
+
-
Terminal
E10
145
152
Battery voltage
Is the inspection result normal?
YES
GO TO 6.
NO
GO TO 5.
- CHECK ECM POWER SUPPLY (MAIN) CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connectors.
- Disconnect IPDM E/R harness connector.
- Check the continuity between ECM harness connector and IPDM E/R harness connector.
+
-
Continuity
ECM
IPDM E/R
Connector
Terminal
Connector
Terminal
E10
145
F50
59
Existed
- Also check harness for short to ground.
Is the inspection result normal?
YES
Perform the trouble diagnosis for power supply circuit. Refer to Wiring Diagram - BATTERY POWER SUPPLY - .
NO
Repair or replace error-detected parts.
- CHECK ECM POWER SUPPLY (MAIN)-II
- Turn ignition switch OFF and wait at least 10 seconds.
- Check the voltage between ECM harness connector terminals as per the following.
ECM
Condition
Voltage
(Approx.)
Connector
+
-
Terminal
E10
145
152
After turning ignition switch OFF, battery voltage will exist for a few seconds
Drop to 0 V
Is the inspection result normal?
YES
GO TO 9.
NO
GO TO 7.
- CHECK ECM RELAY CONTROL SIGNAL
Check the voltage between ECM harness connector terminals as per the following.
ECM
Condition
Voltage
(Approx.)
+
-
Connector
Terminal
Connector
Terminal
F14
86
E10
152
Ignition switch ON
0 V
Turn ignition switch OFF and wait at least 10 seconds.
Battery voltage
Is the inspection result normal?
YES
Check intermittent incident. Refer to Intermittent Incident .
NO
GO TO 8.
- CHECK ECM RELAY CONTROL SIGNAL CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Disconnect IPDM E/R harness connector.
- Check the continuity between ECM harness connector and IPDM E/R harness connector.
+
-
Continuity
ECM
IPDM E/R
Connector
Terminal
Connector
Terminal
F14
86
F51
72
Existed
- Also check harness for short to ground and to power.
Is the inspection result normal?
YES
Replace IPDM E/R. Refer to Removal and Installation .
NO
Repair or replace error-detected parts.
- CHECK IGNITION SWITCH SIGNAL
- Turn ignition switch ON.
- Check the voltage between ECM harness connector terminals.
ECM
Condition
Voltage
(Approx.)
Connector
+
-
Terminal
E10
133
152
Ignition switch OFF
0 V
Ignition switch ON
Battery voltage
Is the inspection result normal?
YES
GO TO 11.
NO
GO TO 10.
- CHECK IGNITION SWITCH SIGNAL CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Disconnect IPDM E/R harness connector.
- Check the continuity between ECM harness connector and IPDM E/R harness connector.
+
-
Continuity
ECM
IPDM E/R
Connector
Terminal
Connector
Terminal
E10
133
E19
21
Existed
- Also check harness for short to ground and to power.
Is the inspection result normal?
YES
Perform the trouble diagnosis for power supply circuit.
NO
Repair or replace error-detected parts.
- CHECK ECM POWER SUPPLY (BACK-UP)
Check the voltage between ECM harness connector terminals.
ECM
Voltage
+
-
Connector
Terminal
Connector
Terminal
F14
116
E10
152
Battery voltage
Is the inspection result normal?
YES
Check intermittent incident. Refer to Intermittent Incident .
NO
GO TO 12.
- CHECK ECM POWER SUPPLY (BACK-UP) CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Disconnect IPDM E/R harness connector.
- Check the continuity between ECM harness connector and IPDM E/R harness connector.
+
-
Continuity
ECM
IPDM E/R
Connector
Terminal
Connector
Terminal
F14
116
F50
58
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.