DTC Diagnosis Procedure
- CHECK THE BATTERY CABLE
- Turn ignition switch OFF.
- Check the battery cable for tightening enough.
NOTE: Check the continuity between the battery cable and the battery terminal.Is the inspection result normal?
YES
GO TO 2.
NO
Repair or replace battery cable connection.
- CHECK ECM INTERMITTENT INCIDENT
Check intermittent incident. Refer to Intermittent Incident .
Is the inspection result normal?
YES
GO TO 3.
NO
Repair or replace ECM connection.
- CHECK FUSE
Check that the following fuse is not blowing.
Location
Fuse No.
Capacity
IPDM E/R
#53
20 A
#54
15 A
Is the fuse blown (open)?
YES
Replace the fuse after repairing the applicable circuit. (If the replaced fuse is blown again, check IPDM E/R power supply circuit.)
NO
GO TO 4.
- CHECK GROUND CONNECTION
- Turn ignition switch OFF.
- Check ground connection E15. Refer to Circuit Inspection .
Is the inspection result normal?
YES
GO TO 5.
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
F78
10
Ground
Existed
50
55
E77
147
149
152
Is the inspection result normal?
YES
GO TO 6.
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
E77
145
152
Battery voltage
Is the inspection result normal?
YES
GO TO 7.
NO
GO TO 8.
- 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
E77
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 11.
NO
GO TO 9.
- 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
E77
145
E121
4
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 ECM RELAY CONTROL SIGNAL
Check the voltage between ECM harness connector terminals as per the following.
ECM
Condition
Voltage
(Approx.)
Connector
+
Connector
-
Terminal
Terminal
F79
88
E77
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 10.
- 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
F79
88
E121
7
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
E77
133
152
Ignition switch OFF
0 V
Ignition switch ON
Battery voltage
Is the inspection result normal?
YES
GO TO 13.
NO
GO TO 12.
- 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
E77
133
E119
3
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.
+
-
Voltage
ECM
ECM
Connector
Terminal
Connector
Terminal
F79
120
E77
152
Battery voltage
Is the inspection result normal?
YES
Check Intermittent Incident. Refer to Intermittent Incident .
NO
GO TO 14.
- 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
F79
120
E121
30
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.