P1554

P1554 BATTERY CURRENT SENSOR

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 1st trip 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 at idle.
-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

With CONSULT
1.Start engine and let it idle.
2.Select "BAT CUR SEN" in "DATA MONITOR" mode of "ENGINE" using CONSULT.
3.Check "BAT CUR SEN" indication for 10 seconds.
"BAT CUR SEN" should be above 2,300 mV at least once.
Without CONSULT
1.Start engine and let it idle.
2.Check the voltage between ECM harness connector and ground.





*1: Except for California
*2: For California
Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to "Diagnosis Procedure" .


Diagnosis Procedure


1. CHECK BATTERY CURRENT SENSOR POWER SUPPLY

1.Turn ignition switch OFF.
2.Disconnect battery current sensor harness connector.
3.Turn ignition switch ON.
4.Check the voltage between battery current sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 2.

2. CHECK SENSOR POWER SUPPLY 2 CIRCUIT

Perform "Diagnosis Procedure" Sensor Power Supply2 Circuit.
Is the inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit.
NO- Repair or replace error-detected parts.

3. CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT

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





*1: Except for California
*2: For California
4.Also check harness for short to power.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace error-detected parts.

4. CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT

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





*1: Except for California
*2: For California
2.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace error-detected parts

5. 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 negative cable assembly.


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 ECM harness connector and ground.





*1: Except for California
*2: For California
Is the inspection result normal?
YES- INSPECTION END
NO- Replace battery negative cable assembly.