Nissan Maxima. Manual - part 500

EC-484

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

ASCD BRAKE SWITCH

2.

CHECK ASCD BRAKE SWITCH-II

1. Adjust ASCD brake switch installation. Refer to 

BR-14, "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. Refer to 

BR-18, "Removal

and Installation"

.

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released.

Existed

Slightly depressed.

Not existed

SEC023D

ASCD INDICATOR

EC-485

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ASCD INDICATOR

Description

INFOID:0000000010095198

ASCD indicator lamp illuminates to indicate ASCD operation status. CRUISE is integrated in combination

meter.

CRUISE illuminates when MAIN switch on ASCD steering switch is turned ON to indicated that ASCD system

is ready for operation.

Refer to 

EC-68, "System Diagram"

 for the ASCD function.

Component Function Check

INFOID:0000000010095199

1.

CHECK ASCD INDICATOR FUNCTION

Check ASCD indicator under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-485, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010095200

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. Refer to 

EC-161, "Diagnosis Procedure"

.

2.

CHECK COMBINATION METER FUNCTION

Refer to 

MWI-29, "CONSULT Function (METER/M&A)"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace malfunctioning part.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace combination meter. Refer to 

MWI-122, "Removal and Installation"

.

NO

>> Repair or replace malfunctioning part.

ASCD INDICATOR

CONDITION

SPECIFICATION

CRUISE

• Ignition switch: ON

• MAIN switch: Pressed at the 

1st time 

→

at the 2nd time

ON 

→ OFF

EC-486

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

COOLING FAN

COOLING FAN

Description

INFOID:0000000010095201

The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant 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 per the following.

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

the middle speed condition.

Refer to 

EC-77, "System Diagram"

.

Component Function Check

INFOID:0000000010095202

1.

CHECK COOLING FAN FUNCTION

With CONSULT

1. Turn ignition switch ON.

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

3. Check that cooling fan speed varies according to the percentage.

Without CONSULT

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

PCS-11, "Diagnosis

Description"

.

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

YES

>> INSPECTION END

NO

>> Go to 

EC-486, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010095203

Regarding Wiring Diagram information, refer to 

EC-554, "Wiring Diagram"

.

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

COOLING FAN

EC-487

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YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.

• 10 A fuse (No. 33)

• 40 A fusible link (letter K)

• Joint connector-E01 E1

• IPDM E/R harness connector E18

• Junction block connectors E44, E48

• Harness for open or short between cooling fan relay-2 and battery

• Harness for open or short between cooling fan relay-3 and battery

• Harness for open or short between cooling fan relay-2 and IPDM E/R

• Harness for open or short between cooling fan relay-3 and IPDM E/R

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

3.

CHECK COOLING FAN RELAY OUTPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connectors.

3. Check the continuity between cooling fan relay-2, -3 harness connectors and IPDM E/R harness connec-

tor.

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

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.

• Harness for open or short between cooling fan relay-2 and IPDM E/R

• Harness for open or short between cooling fan relay-3 and IPDM E/R

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

5.

CHECK COOLING FAN MOTOR POWER SUPPLY CIRCUIT

1. Disconnect cooling fan motor-1 harness connector.

2. Check the voltage between cooling fan motor-1 harness con-

nector and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.

Cooling fan relay

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

E42

(cooling fan relay-2)

1

E17

42

Existed

E43

(cooling fan relay-3)

1

E18

34

Cooling fan motor-1

Ground

Voltage

Connector

Terminal

E220

1

Ground

Battery voltage

2

PBIB1670E