PR25DD engine
- CHECK FUSE
Check that the following fuse is not blowing.
Location
Fuse No.
Capacity
IPDM E/R
#48
10 A
#52
15 A
#54
15 A
#57
10 A
Is the fuse blown (open)?
YES
Replace the fuse after repairing the applicable circuit. (If the replaced fuse is blown again, check the power supply circuit upstream of IPDM E/R.)
NO
GO TO 2.
- CHECK GROUND CONNECTION
- Turn ignition switch OFF.
- Check ground connection E9. Refer to Inspection .
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.
ECM
Ground
Continuity
Connector
Terminal
F91
5
Ground
Existed
65
F90
69
70
E31
157
159
162
Is the inspection result normal?
YES
GO TO 4.
NO
Repair or replace error-detected parts.
- CHECK ECM POWER SUPPLY (MAIN)-1
- Reconnect ECM harness connector.
- Turn ignition switch ON.
- Check the voltage between ECM harness connector terminals.
ECM
Voltage
+
-
Connector
Terminal
Connector
Terminal
F90
96
E31
162
Battery voltage
104
116
E31
155
Is the inspection result normal?
YES
GO TO 5.
NO
GO TO 6.
- CHECK ECM POWER SUPPLY (MAIN)--2
- 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
Connector
Terminal
F90
96
E31
162
After turning ignition switch OFF, battery voltage will exist for a few seconds
Drop to 0 V
104
116
E31
155
Is the inspection result normal?
YES
GO TO 9.
NO
GO TO 7.
- CHECK ECM POWER SUPPLY (MAIN) CIRCUIT-1
- 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
F90
96
F10
78
Existed
104
116
E31
155
73
- Also check harness for short to ground.
Is the inspection result normal?
YES
Perform the trouble diagnosis for IPDM E/R 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
Terminal
Connector
Terminal
F90
74
E31
162
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 Inspection .
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
F90
74
E63
93
Existed
- Also check harness for short to ground and to power.
Is the inspection result normal?
YES
Replace IPDM E/R. Refer to Removal & 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
E31
143
162
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
E31
143
E18
43
Existed
- Also check harness for short to ground and to power.
Is the inspection result normal?
YES
Perform the trouble diagnosis for IPDM E/R 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
F90
123
E31
162
Battery voltage
Is the inspection result normal?
YES
Check Intermittent Incident. Refer to Inspection .
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
F90
123
E18
44
Existed
- Also check harness for short to ground.
Is the inspection result normal?
YES
Perform the trouble diagnosis for IPDM E/R power supply circuit.
NO
Repair or replace error-detected parts.