Nissan Quest E52. Manual - part 551

EC-414

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

ASCD BRAKE SWITCH

ASCD BRAKE SWITCH

Component Function Check

INFOID:0000000009651271

1.

CHECK ASCD BRAKE SWITCH FUNCTION

 With CONSULT

1.

Turn ignition switch ON.

2.

Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT.

3.

Check “BRAKE SW1” indication under the following conditions.

 Without CONSULT

1.

Turn ignition switch ON.

2.

Check the voltage between ECM harness connector terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-414, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009651272

1.

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 connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect fuse block (J/B) harness connector.

3.

Check the continuity between ASCD brake switch harness connector and fuse block (J/B) harness con-
nector.

Is the inspection result normal?

Monitor item

Condition

Indication

BRAKE SW1

Brake pedal

Slightly depressed

OFF

Fully released

ON

ECM

Condition

Voltage

Connector

+

–

Terminal

Terminal

E16

126

(ASCD brake 

switch signal)

128

Brake pedal

Slightly depressed

Approx. 0 V

Fully released

Battery voltage

ASCD brake switch

Ground

Voltage

Connector

Terminal

E109

1

Ground

Battery voltage

ASCD brake switch

Fuse block (J/B)

Continuity

Connector

Terminal

Connector

Terminal

E109

1

E103

4F

Existed

ASCD BRAKE SWITCH

EC-415

< DTC/CIRCUIT DIAGNOSIS >

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YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

3.

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 brake 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 4.

NO

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

4.

CHECK ASCD BRAKE SWITCH

Check ASCD brake switch. Refer to 

EC-415, "Component Inspection (ASCD Brake Switch)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

NO

>> Replace ASCD brake switch. Refer to 

BR-18, "Exploded View"

.

Component Inspection (ASCD Brake Switch)

INFOID:0000000009651273

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-7, "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, "Exploded View"

.

ASCD brake switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E109

2

E16

126

Existed

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Existed

Slightly depressed

Not existed

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Existed

Slightly depressed

Not existed

EC-416

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

ASCD INDICATOR

ASCD INDICATOR

Component Function Check

INFOID:0000000009651274

1.

CHECK ASCD INDICATOR FUNCTION

Check ASCD indicator under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-416, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009651275

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 FUNCTION

Check combination meter function. Refer to 

MWI-35, "CONSULT Function"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace malfunctioning part.

3.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace combination meter. Refer to 

MWI-93, "Exploded View"

.

NO

>> Repair or replace error-detected parts.

ASCD INDICATOR

CONDITION

SPECIFICATION

CRUISE

• Ignition switch: ON

• MAIN switch: Pressed at the 

1st time 

→

at the 2nd time

ON 

→

 OFF

COOLING FAN

EC-417

< DTC/CIRCUIT DIAGNOSIS >

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COOLING FAN

Component Function Check

INFOID:0000000009651276

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 operates at each speed.

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 at each speed.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-417, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009651277

1.

CHECK COOLING FAN RELAY POWER SUPPLY

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 connectors and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Perform the trouble diagnosis for power supply circuit.

2.

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 3.

NO

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

3.

CHECK COOLING FAN MOTOR POWER SUPPLY

Cooling fan relay

Ground

Voltage

Connector

Terminal

E57

(cooling fan relay-2)

2

Ground

Battery voltage

5

E59

(cooling fan relay-3)

2

5

Cooling fan relay

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

E57

(cooling fan relay-2)

1

E11

42

Existed

E59

(cooling fan relay-3)

1

E10

34