Nissan Altima L32. Manual - part 456

ASCD BRAKE SWITCH

EC-945

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

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7.

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ASCD brake switch harness connector.

3. Turn ignition switch ON.

4. Check the voltage between ASCD brake switch harness con-

nector and ground.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• Fuse block (J/B) connector E6

• Junction block connector E44, E46

• 10A fuse (No. 3)

• Harness for open or short between ASCD brake switch and fuse

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

9.

CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Check the continuity between ASCD brake switch harness connector and ASCD clutch switch harness

connector.

3. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES 

>> GO TO 10.

NO

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

10.

CHECK ASCD BRAKE SWITCH

Refer to 

EC-946, "Component Inspection (ASCD Brake Switch)"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace ASCD brake switch.

11.

CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector

3. Check the continuity between ASCD clutch switch 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 12.

ASCD brake switch

Ground

Voltage

Connector

Terminal

E37

1

Ground

Battery voltage

PBIB0857E

ASCD brake switch

ASCD clutch switch

Continuity

Connector

Terminal

Connector

Terminal

E37

2

E39

1

Existed

ASCD clutch switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E39

2

E10

110

Existed

EC-946

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

ASCD BRAKE SWITCH

NO

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

12.

CHECK ASCD CLUTCH SWITCH

Refer to 

EC-946, "Component Inspection (ASCD Clutch Switch)"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace ASCD clutch switch.

13.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (ASCD Brake Switch)

INFOID:0000000004349935

1.

CHECK ASCD BRAKE SWITCH-I

1. Turn ignition switch OFF.

2. Disconnect ASCD brake switch harness connector.

3. Check the continuity between ASCD brake switch terminals

under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

CHECK ASCD BRAKE SWITCH-II

1. Adjust ASCD brake switch installation. Refer to 

BR-13, "Inspection and Adjustment"

.

2. Check the continuity between ASCD brake switch terminals

under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace ASCD brake switch.

Component Inspection (ASCD Clutch Switch)

INFOID:0000000004349936

1.

CHECK ASCD CLUTCH SWITCH-I

1. Turn ignition switch OFF.

2. Disconnect ASCD clutch switch harness connector.

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Existed

Slightly depressed Not existed

SEC023D

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Existed

Slightly depressed Not existed

SEC023D

ASCD BRAKE SWITCH

EC-947

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

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3. Check the continuity between ASCD clutch switch terminals

under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

CHECK ASCD CLUTCH SWITCH-II

1. Adjust ASCD clutch switch installation. Refer to 

BR-13, "Inspection and Adjustment"

.

2. Check the continuity between ASCD clutch switch terminals

under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace ASCD clutch switch.

Terminals

Condition

Continuity

1 and 2

Clutch pedal

Fully released

Existed

Slightly depressed Not existed

SEC023D

Terminals

Condition

Continuity

1 and 2

Clutch pedal

Fully released

Existed

Slightly depressed Not existed

SEC023D

EC-948

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

ASCD INDICATOR

ASCD INDICATOR

Description

INFOID:0000000004349937

The ASCD operation status is indicated by two indicators, (CRUISE and SET on the information display) on

the combination meter.

CRUISE indicator is displayed to indicate that ASCD system is ready for operation when MAIN switch on

ASCD steering switch is turned ON.

SET indicator is displayed when the following conditions are met. 

• CRUISE indicator is displayed.

• SET/COAST switch on ASCD steering switch is turned ON while vehicle speed is within the range of ASCD

setting.

SET indicator is displayed during ASCD control.

Refer to 

EC-603, "System Description"

 for the ASCD function.

Component Function Check

INFOID:0000000004349938

1.

ASCD INDICATOR FUNCTION

Check ASCD indicator under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-948, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000004349939

1.

CHECK DTC

Check that DTC UXXXX is not displayed.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Perform trouble diagnosis for DTC UXXXX.

2.

CHECK COMBINATION METER OPERATION

Refer to 

MWI-38, "CONSULT-III Function (METER/M&A)"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check combination meter circuit. Refer to  

MWI-5, "METER SYSTEM : System Diagram"

.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

ASCD INDICATOR

CONDITION

SPECIFICATION

CRUISE

• Ignition switch: ON

• MAIN switch: Pressed at the 

1st time 

→at the 2nd time

ON 

→ OFF

SET

• MAIN  switch:  ON
• When vehicle speed: Be-

tween 40 km/h (25 MPH) and 
144 km/h (89 MPH)

• ASCD: Operating

ON

• ASCD: Not operating

OFF