Infiniti QX56 (Z62). Manual - part 610

EC-418

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P1551, P1552 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

P1551, P1552 BATTERY CURRENT SENSOR

EC-419

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

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Component Inspection (Battery Current Sensor)

INFOID:0000000006217924

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-420

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P1553 BATTERY CURRENT SENSOR

P1553 BATTERY CURRENT SENSOR

DTC Logic

INFOID:0000000006217925

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is 8 V or more at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and let it idle for least 10 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-420, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006217926

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

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1553

BAT CURRENT SENSOR
(Battery current sensor per-
formance)

The signal voltage transmitted from 
the sensor to ECM is higher than the 
amount of the maximum power gener-
ation.

• 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 
shorted.)

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

Battery current sensor

Ground

Voltage (V)

Connector

Terminal

E63

2

Ground

Approx. 5

P1553 BATTERY CURRENT SENSOR

EC-421

< DTC/CIRCUIT DIAGNOSIS >

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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.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair short to ground or short to power in harness or connectors.

5.

CHECK COMPONENTS

Check the following.
• Crankshaft position sensor (Refer to 

EC-301, "Component Inspection (Crankshaft Position Sensor)"

.)

• Camshaft position sensor (bank 1) (Refer to 

EC-306, "Component Inspection (Camshaft Position Sensor)"

.)

• EVAP control system pressure sensor (Refer to 

EC-520, "Component Function Check"

.)

• Refrigerant pressure sensor (Refer to 

EC-520, "Component Function Check"

.)

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace malfunctioning component.

6.

CHECK APP SENSOR

Refer to 

EC-470, "Component Inspection (Accelerator Pedal Position Sensor)"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> GO TO 7.

7.

REPLACE ACCELERATOR PEDAL ASSEMBLY

Replace accelerator pedal assembly. Refer to 

ACC-3, "MODELS WITHOUT DISTANCE CONTROL ASSIST

SYSTEM : Removal and Installation"

 (Without distance control assist system) or 

ACC-4, "MODELS WITH

DISTANCE CONTROL ASSIST SYSTEM : Removal and Installation"

 (With distance control assist system).

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

E80

133

EVAP control system pressure sen-
sor

C17

3

Refrigerant pressure sensor

E77

1

131

APP sensor 2 (Without ICC)

E110

1

APP sensor 2 (with ICC)

E67

9