DTC Diagnosis Procedure
- CHECK DTC PRIORITY
If DTC P1554 is displayed with DTC P0643, first perform the confirmation procedure (trouble diagnosis) for DTC P0643.
Is DTC P0643 detected?
YES
Perform diagnosis for P0643. Refer to DTC Description .
NO
GO TO 2.
- CHECK GROUND CONNECTION
- Turn ignition switch OFF.
- Check ground connection E191. Refer to Ground Inspection in Refer to Inspection .
Is the inspection result normal?
YES
GO TO 3.
NO
Repair or replace ground connection.
- CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT-I
- Disconnect battery current sensor harness connector.
- Turn ignition switch ON.
- Check the voltage between battery current sensor harness connector and ground.
+
-
Voltage
(Approx.)
Battery current sensor
Connector
Terminal
E7
4
Ground
5 V
Is the inspection result normal?
YES
GO TO 5.
NO
GO TO 4.
- CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT-II
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between battery current sensor harness connector and ECM harness connector.
+
-
Continuity
Battery current sensor
ECM
Connector
Terminal
Connector
Terminal
E7
4
F143
42
Existed
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO 6.
NO
GO TO 5.
- CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between battery current sensor harness connector and ECM harness connector.
+
-
Continuity
Battery current sensor
ECM
Connector
Terminal
Connector
Terminal
E7
2
F143
29
Existed
- Also check harness for short to power.
Is the inspection result normal?
YES
GO TO 6.
NO
Repair or replace error-detected parts.
- CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT
- Check the continuity between battery current sensor harness connector and ECM harness connector.
+
-
Continuity
Battery current sensor
ECM
Connector
Terminal
Connector
Terminal
E7
1
F143
56
Existed
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO 7.
NO
Repair or replace error-detected parts.
- Check the continuity between battery current sensor harness connector and ECM harness connector.
- CHECK BATTERY CURRENT SENSOR
Refer to Component Inspection .
Is the inspection result normal?
YES
INSPECTION END
NO
Replace battery negative cable assembly.