Nissan Altima L32. Manual - part 333

ASCD BRAKE SWITCH

EC-453

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

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NO

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

12.

CHECK ASCD CLUTCH SWITCH

Refer to 

EC-453, "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:0000000004349511

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:0000000004349512

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

EC-454

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

ASCD BRAKE SWITCH

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

ASCD INDICATOR

EC-455

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[QR25DE FOR CALIFORNIA]

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ASCD INDICATOR

Description

INFOID:0000000004349513

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-67, "System Description"

 for the ASCD function.

Component Function Check

INFOID:0000000004349514

1.

ASCD INDICATOR FUNCTION

Check ASCD indicator under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-455, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000004349515

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

EC-456

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

COOLING FAN

COOLING FAN

Description

INFOID:0000000004349516

The ECM controls the cooling fan corresponding to the vehicle speed, engine colant temperature, refrigerant

pressure, and air conditioner ON signal. The control system has 4-step control [HIGH/MIDDLE/LOW/OFF].

COOLING FAN MOTOR

The cooling fan operates at each speed when the current flows in the cooling fan motor as follows.

The cooling fan operates at low (LOW) speed when cooling fan motors-1 and -2 are circuited in series and

middle speed condition.

Refer to 

EC-77, "System Diagram"

.

Component Function Check

INFOID:0000000004349517

1.

CHECK COOLING FAN FUNCTION

With CONSULT-III

1. Turn ignition switch ON.

2. Perform “COOLING FAN” in “ACTIVE TEST” mode with CONSULT-III.

3. Touch “LOW”“MID” “Hi” on the CONSULT-III screen.

4. Check that cooling fan operates.

Without CONSULT-III

1. Perform IPDM E/R auto active test and check cooling fan motors operation, refer to 

PCS-14, "Diagnosis

Description"

.

2. Check that cooling fan operates.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Refer to 

EC-456, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000004349518

1.

CHECK COOLING FAN RELAY POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect cooling fan relays-2, -3.

3. Turn ignition switch ON.

4. Check the voltage between cooling fan relays-2, -3 harness con-

nectors and ground.

Is the inspection result normal?

Cooling fan Speed

Cooling fan motor terminals

(+)

(–)

Middle (MID)

1

3 and 4

2

3 and 4

1 and 2

3

1 and 2

4

High (HI)

1 and 2

3 and 4

Cooling fan relay

Ground

Voltage

Connector

Terminal

E42

(cooling fan relay-2)

2

Ground

Battery voltage

5

E43

(cooling fan relay-3)

2

5

PBIB0071E