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
- Turn ignition switch OFF.
- Check that the following fuse is not blowing.
Location
Fuse No.
Capacity
IPDM E/R
No. 71
10 A
No. 80
15 A
No. 91
5 A
Is the fuse blown (open)?
YES
If the replaced fuse is blown again. Check IPDM E/R power supply.
NO
GO TO 4.
- CHECK GROUND CONNECTION
Check ground connection E9 and 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 connector.
- Check the continuity between ECM harness connector and ground.
ECM
--
Continuity
Connector
Terminal
F24
5
Ground
Existed
65
F25
69
E16
157
159
162
- Also check harness for short to power.
Is the inspection result normal?
YES
GO TO 6.
NO
Repair or replace malfunctioning part.
- CHECK ECM POWER SUPPLY-1
- Reconnect ECM harness connector.
- Turn ignition switch ON.
- Check the voltage between ECM harness connector and ground.
ECM
Voltage
(Approx.)
Connector
+
-
Terminal
E16
155
162
Battery voltage
Is the inspection result normal?
YES
GO TO 7.
NO
GO TO 8.
- CHECK ECM POWER SUPPLY-2
Check the voltage between ECM harness connector and ground.
ECM
Condition
Voltage
(Approx.)
Connector
+
-
Terminal
E16
155
162
Ignition switch ON -> OFF
After turning ignition switch OFF, battery voltage will exist for a few seconds and drop to approximately 0 V.
Is the inspection result normal?
YES
GO TO 11.
NO
GO TO 9.
- CHECK ECM POWER SUPPLY 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.
ECM
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
E16
155
F96
73
Existed
- Also check harness for short to power.
Is the inspection result normal?
YES
GO TO 9.
NO
Repair or replace malfunctioning part.
- CHECK ECM RELAY CONTROL SIGNAL
Check the voltage between ECM harness connector terminals as per the following.
+
-
Condition
Voltage
(Approx.)
ECM
Connector
Terminal
Connector
Terminal
Ignition switch ON
0 V
F25
74
E16
162
Turn ignition switch OFF and wait at least 10 seconds.
Battery voltage
Is the inspection result normal?
YES
GO TO 12.
NO
GO TO 10.
- CHECK ECM RELAY CONTROL 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.
ECM
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
F25
74
F98
93
Existed
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
Replace IPDM E/R. Refer to Removal and Installation .
NO
Repair or replace malfunctioning part.
- CHECK IGNITION SWITCH SIGNAL
- Turn ignition switch ON.
- Check the voltage between ECM harness connector terminals.
ECM
Condition
Voltage
(Approx.)
Connector
+
-
Terminal
E16
143
162
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
E16
143
E43
19
Existed
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
Perform trouble diagnosis for power supply.
NO
Repair or replace malfunctioning part.
- CHECK ECM POWER SUPPLY (BACK-UP)
Check the voltage between ECM harness connector terminals.
ECM
Voltage
+
-
Connector
Terminal
Connector
Terminal
F25
123
E16
162
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.
- Pull out 10 A fuse (No. 71).
- Check the continuity between ECM harness connector and fuse.
ECM
Fuse No.
Continuity
Connector
Terminal
F25
123
71
Existed
- Also check harness for short to ground.
Is the inspection result normal?
YES
Perform the trouble diagnosis for battery power supply circuit.
NO
Repair or replace error-detected parts.