Nissan Frontier D40. Manual - part 525

P1554 BATTERY CURRENT SENSOR

EC-791

< COMPONENT DIAGNOSIS >

[VQ40DE]

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3.

Install jumper cable between battery negative terminal and body
ground.

4.

Turn ignition switch ON.

5.

Check voltage between ECM terminal 71 (battery current sensor
signal) and ground.

6.

If NG, replace battery negative cable assembly.

BBIA0588E

Voltage: Approximately 2.5V

PBIB2617E

EC-792

< COMPONENT DIAGNOSIS >

[VQ40DE]

P1564 ASCD STEERING SWITCH

P1564 ASCD STEERING SWITCH

Component Description

INFOID:0000000005273797

ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation
of switch, and determines which button is operated.

Refer to 

EC-489, "System Description"

 for the ASCD function.

On Board Diagnosis Logic

INFOID:0000000005273798

This self-diagnosis has the one trip detection logic.
The MIL will not illuminate for this diagnosis.
NOTE:
If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to

EC-755

.

DTC Confirmation Procedure

INFOID:0000000005273799

NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step. 
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.

 WITH CONSULT-III

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.

7.

If DTC is detected, go to 

EC-792, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005273800

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

PBIB2645E

DTC No.

Trouble Diagnosis 

Name

DTC Detecting Condition

Possible Cause

P1564
1564

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 steer-

ing 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

P1564 ASCD STEERING SWITCH

EC-793

< COMPONENT DIAGNOSIS >

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2.

Loosen and retighten three ground screws on the body. Refer to 

EC-549, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

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.

 Without CONSULT-III

1.

Turn ignition switch ON.

2.

Check voltage between ECM terminal 99 and ground with press-
ing each button.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 3.

3.

CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect combination switch harness connector.

BBIA0539E

Switch Monitor 

item

Condition

Indication

MAIN switch

MAIN SW

Pressed

ON

Released

OFF

CANCEL switch

CANCEL SW

Pressed

ON

Released

OFF

RESUME/ACCELER-
ATE switch

RESUME/ACC SW

Pressed

ON

Released

OFF

SET/COAST switch

SET SW

Pressed

ON

Released

OFF

Switch

Condition

Voltage [V]

MAIN switch

Pressed

Approx. 0

Released

Approx. 4

CANCEL switch

Pressed

Approx. 1

Released

Approx. 4

RESUME/ACCELERATE 
switch

Pressed

Approx. 3

Released

Approx. 4

SET/COAST switch

Pressed

Approx. 2

Released

Approx. 4

PBIB0311E

EC-794

< COMPONENT DIAGNOSIS >

[VQ40DE]

P1564 ASCD STEERING SWITCH

3.

Disconnect ECM harness connector.

4.

Check harness continuity between combination switch terminal 15 and ECM terminal 67. Refer to Wiring
Diagram.

5.

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

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors M31, E152
• Harness connectors E5, F14
• Combination switch (spiral cable)
• Harness for open and short between ECM and combination switch

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

5.

CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between ECM terminal 99 and combination switch terminal 14.
Refer to Wiring Diagram.

2.

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

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors M31, E152
• Combination switch (spiral cable)
• Harness for open and short between ECM and combination switch

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

7.

CHECK ASCD STEERING SWITCH

Refer to 

EC-794, "Component Inspection"

.

OK or NG

OK

>> GO TO 8.

NG

>> Replace steering switch.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-46, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005273801

ASCD STEERING SWITCH

1.

Disconnect combination switch (spiral cable).

Continuity should exist.

Continuity should exist.