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 with CONSULT.
3.Check "BAT CUR SEN" indication for 10 seconds.
"BAT CUR SEN" should be above 2,300mV at least once.

Without CONSULT
1.Start engine and let it idle.
2.Check voltage between ECM harness connector terminals under the following conditions.





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


Diagnosis Procedure


1. CHECK BATTERY CURRENT SENSOR POWER SUPPLY

Revision: March 20122013 Infiniti JX
1.Disconnect battery current sensor harness connector.
2.Turn ignition switch ON.
3.Check the voltage between battery current sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 2.
NO- Repair open circuit, short to ground or short to power in harness or connectors.

2. 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.





4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 3.
NO- Repair open circuit, short to ground or short to power in harness or connectors.

3. CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT

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





2.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair open circuit, short to ground or short to power in harness or connectors.

4. CHECK BATTERY CURRENT SENSOR

Check 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.
Revision: March 20122013 Infiniti JX





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 terminals under the following conditions.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace battery negative cable assembly.
Revision: March 20122013 Infiniti JX