Nissan Frontier D40. Instruction — part 540

ASCD BRAKE SWITCH

EC-851

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[VQ40DE]

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3.

Check voltage between stop lamp switch terminal 2 and ground
with CONSULT -II or tester.

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E160
• 10 A fuse (No.20)
• Harness for open or short between stop lamp switch and battery

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

12.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
Refer to Wiring Diagram.

3.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 13.

NG

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

13.

CHECK STOP LAMP SWITCH

Refer to

EC-851, "Component Inspection"

.

OK or NG

OK

>> GO TO 14.

NG

>> Replace stop lamp switch.

14.

CHECK INTERMITTENT INCIDENT

Refer to

GI-46, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005273868

ASCD BRAKE SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect ASCD brake switch harness connector.

Voltage: Battery voltage

MBIB1407E

Continuity should exist.

EC-852

< COMPONENT DIAGNOSIS >

[VQ40DE]

ASCD BRAKE SWITCH

3.

Check harness continuity between ASCD brake switch terminals
1 and 2 under the following conditions.

If NG, adjust ASCD brake switch installation, refer to

BR-19,

"Inspection and Adjustment"

, and perform step 3 again.

ASCD CLUTCH SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect ASCD clutch switch harness connector.

3.

Check harness continuity between ASCD clutch switch termi-
nals 1 and 2 under the following conditions.

If NG, adjust ASCD clutch switch installation, refer to

CL-8, "On-

Vehicle Inspection and Adjustment"

, and perform step 3 again.

STOP LAMP SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect stop lamp switch harness connector.

3.

Check harness continuity between stop lamp switch terminals 1
and 2 under the following conditions.

If NG, adjust stop lamp switch installation, refer to

BR-19,

"Inspection and Adjustment"

, and perform step 3 again.

Condition

Continuity

When brake pedal: Fully released.

Should exist.

When brake pedal: Slightly depressed.

Should not exist.

SEC023D

Condition

Continuity

Clutch pedal: Fully released

Should exist

Clutch pedal: Slightly depressed

Should not exist

SEC024D

Condition

Continuity

When brake pedal: Fully released.

Should not exist.

When brake pedal: Slightly depressed.

Should exist.

PBIB1185E

ASCD INDICATOR

EC-853

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ASCD INDICATOR

Component Description

INFOID:0000000005273869

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

ASCD setting.

SET indicator remains lit during ASCD control.
Refer to

EC-489, "System Description"

for the ASCD function.

Diagnosis Procedure

INFOID:0000000005273870

1.

CHECK OVERALL FUNCTION

Check ASCD indicator under the following conditions.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2.

CHECK DTC

Check that DTC UXXXX is not displayed.
OK or NG

OK

>> GO TO 3.

NG

>> Perform trouble diagnoses for DTC UXXXX.

3.

CHECK COMBINATION METER FUNCTION

Refer to

MWI-3, "Work Flow"

.

OK or NG

OK

>> GO TO 4.

NG

>> Go to

MWI-4, "METER SYSTEM : System Diagram"

.

4.

CHECK INTERMITTENT INCIDENT

Refer to

GI-46, "Intermittent Incident"

.

>> INSPECTION END

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-854

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[VQ40DE]

COOLING FAN

COOLING FAN

Description

INFOID:0000000005273871

COMPONENT DESCRIPTION

Cooling Fan Motor

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

Diagnosis Procedure

INFOID:0000000005273872

1.

CHECK IPDM E/R GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connectors E122, E124.

3.

Check harness continuity between IPDM E/R terminals 38, 59 and ground.
Refer to Wiring Diagram.

4.

Also check harness for short to power.

OK or NG

OK

>> GO TO 2.

NG

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

2.

CHECK COOLING FAN MOTOR CIRCUIT FOR OPEN AND SHORT

1.

Disconnect cooling fan motor harness connector.

2.

Check harness continuity between the following;
cooling fan motor terminal 1 and IPDM E/R terminal 20,
cooling fan motor terminal 2 and IPDM E/R terminal 24.
Refer to Wiring Diagram.

3.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 3.

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

3.

CHECK COOLING FAN MOTER GROUND CIRCUIT FOR OPEN OR SHORT

1.

Check harness continuity between the following;
cooling fan motor terminal 3 and ground,
cooling fan motor terminal 4 and ground.
Refer to Wiring Diagram.

2.

Also check harness for short to power.

OK or NG

OK

>> GO TO 4.

NG

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

Cooling fan speed

Cooling fan motor terminals

(+)

(

−

)

Low (LOW)

1

3 and 4

2

3 and 4

High (HI)

1 and 2

3 and 4

Continuity should exist.

Continuity should exist.

BBIA0555E

Continuity should exist.