Infiniti QX56 (Z62). Manual - part 611

EC-422

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P1553 BATTERY CURRENT SENSOR

>> INSPECTION END

8.

CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

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 10.

NO

>> GO TO 9.

9.

DETECT MALFUNCTIONING PART

Check the following.
• Harness for open or short between battery current sensor and ECM
• Loose or poor connection for each connector and harness

>> Repair open circuit, short to ground or short to power in harness or connectors.

10.

CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

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 12.

NO

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.
• Harness for open or short between battery current sensor and ECM
• Loose or poor connection for each connector and harness

>> Repair open circuit, short to ground or short to power in harness or connectors.

12.

CHECK BATTERY CURRENT SENSOR

Refer to 

EC-427, "Component Inspection (Battery Current Sensor)"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace battery negative cable assembly.

13.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Battery current sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

E63

4

E80

150

Existed

Battery current sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

E63

3

E80

138

Existed

P1553 BATTERY CURRENT SENSOR

EC-423

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

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Component Inspection (Battery Current Sensor)

INFOID:0000000006217927

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 terminals
under the following conditions.

Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to 

PG-159, "How to Handle Battery"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace battery negative cable assembly.

: To body ground

ECM

Voltage (V)

Connector

+

–

Terminal

Terminal

E80

138

(Battery current sensor signal)

150

Approx. 2.5

JPBIA3287ZZ

EC-424

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P1554 BATTERY CURRENT SENSOR

P1554 BATTERY CURRENT SENSOR

DTC Logic

INFOID:0000000006217928

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM COMPONENT FUNCTION CHECK

Perform Component Function Check. Refer to 

EC-424, "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

>> Go to 

EC-425, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000006217929

1.

PRECONDITIONING

TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is 12.8 V or more 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-III

1.

Start engine and let it idle.

2.

Select “BAT CUR SEN” in “DATA MONITOR” mode with CONSULT-III.

3.

Check “BAT CUR SEN” indication for 10 seconds.
“BAT CUR SEN” should be above 2,300 mV at least once.

 WITHOUT CONSULT-III

1.

Start engine and let it idle.

2.

Check the voltage between ECM harness connector terminals as per the following.

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1554

BAT CURRENT SENSOR
(Battery current sensor per-
formance)

The output voltage of the bat-
tery current sensor is lower than 
the specified value while the 
battery voltage is high enough.

• Harness or connectors

(Battery current sensor circuit is open or shorted.)
(Accelerator pedal position sensor 2 circuit is shorted.)
[Camshaft position sensor (bank 1) circuit is shorted.]
(Crankshaft position sensor circuit is shorted.)
(Refrigerant pressure sensor circuit is shorted.)
(EVAP control system pressure sensor circuit is short-
ed.)

• Battery current sensor
• Accelerator pedal position sensor
• Camshaft position sensor (bank 1)
• Crankshaft position sensor
• Refrigerant pressure sensor
• EVAP control system pressure sensor

P1554 BATTERY CURRENT SENSOR

EC-425

< DTC/CIRCUIT DIAGNOSIS >

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Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-425, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006217930

1.

CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT-I

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 8.

NO

>> GO TO 2.

2.

CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT-II

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• Harness for open between battery current sensor and ECM
• Loose or poor connection for each connector and harness

>> Repair open circuit.

4.

CHECK SENSOR POWER SUPPLY CIRCUIT

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

ECM

Voltage (V)

Connector

+

–

Terminal

Terminal

E80

138

(Battery current sensor signal)

150

Approx. 2.5

Battery current sensor

Ground

Voltage (V)

Connector

Terminal

E63

2

Ground

Approx. 5

Battery current sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

E63

2

E80

133

Existed

ECM

Sensor

Connector

Terminal

Name

Connector

Terminal

F110

76

Crankshaft position sensor

F74

1

77

Camshaft position sensor (bank 1)

F84

1