P1554

DTC Logic


DTC DETECTION LOGIC

NOTE:
If DTC P1554 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
"DTC Logic" P0643.






DTC CONFIRMATION PROCEDURE


1. PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to "Component Function Check" .
NOTE:
Use component function check to check the overall function of the battery current sensor circuit. During this check, a DTC might not be confirmed.
Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to "Diagnosis Procedure" .


Component Function Check


1. PRECONDITIONING

TESTING CONDITION:
-Before performing the following procedure, confirm that battery voltage is more than 12.8 V while power switch ON.
-Before performing the following procedure, confirm that all load switches and A/C switch are turned
OFF.
- GO TO 2.

2. PERFORM COMPONENT FUNCTION CHECK

1.Turn power switch ON.
2.Check the voltage between VCM harness connector terminals.





Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to "Diagnosis Procedure" .


Diagnosis Procedure


1. CHECK BATTERY CURRENT SENSOR POWER SUPPLY-I

1.Turn power switch OFF.
2.Disconnect battery current sensor harness connector.
3.Turn power switch ON.
4.Check the voltage between battery current sensor harness connector terminals.





Is the inspection result normal?
YES- GO TO 7.
NO- GO TO 2.

2. CHECK BATTERY CURRENT SENSOR POWER SUPPLY-II

Check the voltage between battery current sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 5.

3. CHECK VCM GROUND CIRCUIT

1.Turn power switch OFF.
2.Disconnect VCM harness connector.
3.Check the continuity between VCM harness connector and ground.





Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace error-detected parts.

4. CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT

1.Check the continuity between battery current sensor harness connector and VCM harness connector.





2.Also check harness for short to power.
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Repair or replace error-detected parts.

5. CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT

1.Turn power switch OFF.
2.Disconnect VCM harness connector.
3.Check the continuity between VCM harness connector and battery current sensor harness connector.





4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 6.
NO- Repair or replace error-detected parts.

6. CHECK SENSOR POWER SUPPLY CIRCUIT

Check harness for short to power and short to ground, between the following terminals.





Is the inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit. Refer to "VCM : Diagnosis Procedure" VCM.
NO- Repair or replace error-detected parts.

7. CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT

1.Turn power switch OFF.
2.Disconnect VCM harness connector.
3.Check the continuity between battery current sensor harness connector and VCM harness connector.





4.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- GO TO 8.
NO- Repair or replace error-detected parts

8. CHECK BATTERY CURRENT SENSOR

Check the battery current sensor. Refer to "Component Inspection" .
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace battery current sensor. Refer to "Removal and Installation" Removal And Installation.


Component Inspection


1. CHECK BATTERY CURRENT SENSOR

1.Turn ignition switch OFF.
2.Reconnect harness connectors disconnected.
3.Disconnect battery negative cable.





4.Install jumper cable between battery negative terminal and body ground.
5.Turn ignition switch ON.
6.Check the voltage between VCM harness connector terminals.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace battery current sensor. Refer to "Removal and Installation" Removal And Installation.