Infiniti QX56 (Z62). Manual - part 613

EC-430

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P1556, P1557 BATTERY TEMPERATURE SENSOR

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 8.

NO

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

8.

CHECK BATTERY TEMPERATURE SENSOR

Refer to 

EC-430, "Component Inspection (Battery Temprature Sensor)"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Replace battery negative cable assembly.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (Battery Temprature Sensor)

INFOID:0000000006217934

1.

CHECK BATTERY TEMPERATURE SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect battery current sensor.

3.

Check the resistance between battery current sensor connector terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace battery negative cable assembly.

Battery current sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

E63

4

E80

150

Existed

Battery current sensor

Resistance

+

−

Terminal

1

4

continuity with the resis-
tance value 100 

Ω

 or more

P1564 ASCD STEERING SWITCH

EC-431

< DTC/CIRCUIT DIAGNOSIS >

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P1564 ASCD STEERING SWITCH

DTC Logic

INFOID:0000000006217935

DTC DETECTION LOGIC

NOTE:
If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to

EC-376, "DTC 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.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 10 seconds.

2.

Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.

3.

Press CANCEL switch for at least 10 seconds, then release it and wait at least 10 seconds.

4.

Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 sec-
onds.

5.

Press SET/COAST switch for at least 10 seconds, then release it and wait at least 10 seconds.

6.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-431, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006217936

1.

CHECK ASCD STEERING SWITCH CIRCUIT

 WITH CONSULT-III

1.

Turn ignition switch ON.

2.

Select “MAIN SW”, “CANCEL SW”, “RESUME/ACC SW” and “SET SW” in “DATA MONITOR” mode with
CONSULT-III.

3.

Check each item indication under the following conditions.

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1564

ASCD SW
(ASCD steering switch)

• An excessively high voltage signal from the 

ASCD steering switch is sent to ECM.

• ECM detects that input signal from the 

ASCD steering switch is out of the specified 
range.

• ECM detects that the ASCD steering switch 

is stuck ON.

• Harness or connectors

(The switch circuit is open or shorted.)

• ASCD steering switch
• ECM

Monitor item

Condition

Indication

MAIN SW

MAIN switch

Pressed

ON

Released

OFF

CANCEL SW

CANCEL switch

Pressed

ON

Released

OFF

RESUME/ACC SW

RESUME/ACCELERATE 
switch

Pressed

ON

Released

OFF

EC-432

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P1564 ASCD STEERING SWITCH

 WITHOUT CONSULT-III

1.

Turn ignition switch ON.

2.

Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 2.

2.

CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect combination switch harness connector.

4.

Check the continuity between combination switch and ECM harness connector.

5.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• Combination switch (spiral cable)
• Harness for open and short between ECM and combination switch

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

4.

CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check the continuity between combination switch and ECM harness connector.

2.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

SET SW

SET/COAST switch

Pressed

ON

Released

OFF

ECM

Condition

Voltage (V)

Connector

+

–

Terminal

Terminal

E80

128

(ASCD steering switch signal)

130

MAIN switch: Pressed

Approx. 0

CANCEL switch: Pressed

Approx. 1

SET/COAST switch: Pressed

Approx. 2

RESUME/ACCELERATE switch: Pressed

Approx. 3

All ASCD steering switches: Released

Approx. 4

Monitor item

Condition

Indication

Combination switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

—

32

E80

130

Existed

Combination switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

—

25

E80

128

Existed

P1564 ASCD STEERING SWITCH

EC-433

< DTC/CIRCUIT DIAGNOSIS >

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5.

DETECT MALFUNCTIONING PART

Check the following.
• Combination switch (spiral cable)
• Harness for open and short between ECM and combination switch

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

6.

CHECK ASCD STEERING SWITCH

Refer to 

EC-433, "Component Inspection (ASCD Steering Switch)"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace ASCD steering switch. Refer to 

ST-33, "Removal and Installation"

.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (ASCD Steering Switch)

INFOID:0000000006217937

1.

CHECK ASCD STEERING SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect combination switch (spiral cable) harness connector M302.

3.

Check resistance between combination switch harness connector terminals under the following condi-
tions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace ASCD steering switch. Refer to 

ST-33, "Removal and Installation"

.

Combination switch

Condition

Resistance (

Ω

)

Connector

Terminals

M302

13 and 16

MAIN switch: Pressed

Approx. 0

CANCEL switch: Pressed

Approx. 250

SET/COAST switch: Pressed

Approx. 660

RESUME/ACCELERATE switch: Pressed

Approx. 1,480

All ASCD steering switches: Released

Approx. 4,000