Infiniti FX35, FX50 (S51). Manual - part 730

ASCD BRAKE SWITCH

EC-461

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

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

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 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E106, M6
• Harness for open or short between ECM and ASCD brake switch

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

5.

CHECK ASCD BRAKE SWITCH

Refer to 

EC-461, "Component Inspection (ASCD Brake Switch)"

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace ASCD brake switch.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (ASCD Brake Switch)

INFOID:0000000005237072

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.

ASCD brake switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E109

2

M107

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-462

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

ASCD BRAKE SWITCH

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace ASCD brake switch.

ASCD INDICATOR

EC-463

< DTC/CIRCUIT DIAGNOSIS >

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ASCD INDICATOR

Description

INFOID:0000000005237073

ASCD operation status is indicated by two indicators (CRUISE and SET) and CRUISE lamp in combination
meter.
CRUISE indicator is displayed to indicated 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 the

ASCD setting.

SET indicator is displayed during ASCD control.
Refer to 

EC-66, "System Description"

 for the ASCD function.

Component Function Check

INFOID:0000000005237074

1.

CHECK ASCD INDICATOR FUNCTION

Check ASCD indicator under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-463, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005237075

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 DTC WITH “UNIFIED METER AND A/C AMP.”

Refer to 

MWI-45, "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-36, "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-464

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

COOLING FAN

COOLING FAN

Description

INFOID:0000000005237076

COOLING FAN CONTROL MODULE

Cooling fan control module receives ON/OFF pulse duty signal from IPDM E/R. Corresponding to this ON/OFF
pulse duty signal, cooling fan control module sends cooling fan motor operating voltage to cooling fan motor.
The revolution speed of cooling fan motor is controlled by duty cycle of the voltage.

COOLING FAN MOTOR

Cooling fan motor receives cooling fan motor operating voltage from cooling fan control module. The revolu-
tion speed of cooling fan motor is controlled by duty cycle of the voltage.

Component Function Check

INFOID:0000000005237077

1.

CHECK COOLING FAN FUNCTION

With CONSULT-III

1.

Turn ignition switch ON.

2.

Perform “FAN DUTY CONTROL” in “ACTIVE TEST” mode with CONSULT-III.

3.

Check that cooling fan speed varies according to the percentage.

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-464, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005237078

1.

CHECK COOLING FAN CONTROL MODULE 1 POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF.

2.

Disconnect cooling fan control module harness connector E37.

3.

Turn ignition switch ON.

4.

Check the voltage between cooling fan control module 1 harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 7.

2.

CHECK COOLING FAN CONTROL MODULE GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check the continuity between cooling fan control module 1 harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 3.

NO

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

Cooling fan control module 1

Ground

Voltage

Connector

Terminal

E37

3

Ground

Battery voltage

Cooling fan control module 1

Ground

Continuity

Connector

Terminal

E37

1

Ground

Existed