Nissan Teana J32. Manual - part 446

EC-322

< COMPONENT DIAGNOSIS >

[VQ25DE, VQ35DE]

ASCD BRAKE SWITCH

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

Refer to 

EC-322, "Component Inspection (ASCD Brake Switch)"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace ASCD brake switch.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-35, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (ASCD Brake Switch)

INFOID:0000000003858143

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-6, "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.

ASCD brake switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E49

2

E16

110

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

ASCD INDICATOR

EC-323

< COMPONENT DIAGNOSIS >

[VQ25DE, VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

ASCD INDICATOR

Description

INFOID:0000000003856824

ASCD indicator lamp illuminates to indicate ASCD operation status. Lamp has two indicators, CRUISE and
SET, and is integrated in combination meter.
CRUISE lamp illuminates when MAIN switch on ASCD steering switch is turned ON to indicated that ASCD
system is ready for operation.
SET lamp illuminates when the following conditions are met. 
• CRUISE lamp is illuminated.
• SET/COAST switch on ASCD steering switch is turned ON while vehicle speed is within the range of the

ASCD setting.

SET lamp remains lit during ASCD control.
Refer to 

EC-51, "System Diagram"

 for the ASCD function.

Component Function Check

INFOID:0000000003856825

1.

CHECK ASCD INDICATOR FUNCTION

Check ASCD indicator under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-323, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003856826

1.

CHECK DTC

Check that DTC U1000 or U1001 is not displayed.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Perform trouble diagnosis for DTC U1000, U1001. Refer to 

EC-135, "Diagnosis Procedure"

.

2.

CHECK COMBINATION METER FUNCTION

Refer to 

MWI-33, "CONSULT-III 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-35, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace combination meter.

NO

>> Repair or replace malfunctioning part.

ASCD INDICATOR

CONDITION

SPECIFICATION

CRUISE LAMP

• Ignition switch: ON

• MAIN switch: Pressed at the 

1st time 

→

 

at the 2nd time

ON 

→

 OFF

SET LAMP

• MAIN switch: ON
• When vehicle speed is be-

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

• ASCD: Operating

ON

• ASCD: Not operating

OFF

EC-324

< COMPONENT DIAGNOSIS >

[VQ25DE, VQ35DE]

COOLING FAN

COOLING FAN

Description

INFOID:0000000003856827

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-60, "System Diagram"

.

Component Function Check

INFOID:0000000003856828

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.

Check that cooling fan speed varies according to the percent.

Without CONSULT-III

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-324, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003856829

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 connectors and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

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

E57

(cooling fan relay-2)

2

Ground

Battery voltage

5

E59

(cooling fan relay-3)

2

5

COOLING FAN

EC-325

< COMPONENT DIAGNOSIS >

[VQ25DE, VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

2.

DETECT MALFUNCTIONING PART

Check the following.
• 40A fusible link (letter K)
• 10A fuse (No.42)
• IPDM E/R harness connector E10
• 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 4.

NO

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

4.

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 connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connector E70, E305
• 40A fusible link (letter M)
• Harness for open or short between cooling fan motor-1 and battery

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

6.

CHECK COOLING FAN MOTOR CIRCUIT-I

1.

Disconnect cooling fan motor-2 harness connector.

2.

Check the continuity between cooling fan relay-2, -3 harness connectors and cooling fan motor-1, -2 har-
ness connectors.

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

Cooling fan motor-1

Ground

Voltage

Connector

Terminal

E301

1

Ground

Battery voltage

2