Infiniti FX35, FX50 (S51). Manual - part 877

 

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Infiniti FX35, FX50 (S51). Manual - part 877

 

 

P1572 ASCD BRAKE SWITCH

EC-1049

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

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Is 1st trip DTC detected?

YES

>> Go to 

EC-1049, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Drive the vehicle for at least 5 consecutive seconds under the following conditions.

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle.
If a road test is expected to be easier, it is unnecessary to lift the vehicle.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-1049, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005237544

1.

CHECK OVERALL FUNCTION-I

 With CONSULT-III

1.

Turn ignition switch ON.

2.

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

3.

Check “BRAKE SW1” indication under the following conditions.

 Without CONSULT-III

1.

Turn ignition switch ON.

2.

Check the voltage between ECM harness connector terminals as per the following.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK OVERALL FUNCTION-II

 With CONSULT-III

Select “BRAKE SW2” and check indication under the following conditions.

Vehicle speed

More than 30 km/h (19 mph)

Selector lever

Suitable position 

Driving location

Depress the brake pedal for more than 5 seconds so as 
not to come off from the above-mentioned vehicle speed.

Monitor item

Condition

Indication

BRAKE SW1
(ASCD brake switch)

Brake pedal

Slightly depressed

OFF

Fully released

ON

ECM

Condition

Voltage (V)

Connector

+

Terminal

Terminal

M160

117

(ASCD brake switch signal)

128

Brake pedal

Slightly depressed

Approx. 0

Fully released

Battery voltage

Monitor item

Condition

Indication

BRAKE SW2
(Stop lamp switch)

Brake pedal

Slightly depressed

ON

Fully released

OFF

EC-1050

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P1572 ASCD BRAKE SWITCH

 Without CONSULT-III

Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> GO TO 8.

3.

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 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E103
• 10 A fuse (No. 3)
• Harness for open or short between ASCD brake switch and fuse

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

5.

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 7.

NO

>> GO TO 6.

6.

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.

7.

CHECK ASCD BRAKE SWITCH

ECM

Condition

Voltage (V)

Connector

+

Terminal

Terminal

M160

110

(Stop lamp switch signal)

128

Brake pedal

Slightly depressed

Battery voltage

Fully released

Approx. 0

ASCD brake switch

Ground

Voltage

Connector

Terminal

E109

1

Ground

Battery voltage

ASCD brake switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E109

2

M160

117

Existed

P1572 ASCD BRAKE SWITCH

EC-1051

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

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Refer to 

EC-1052, "Component Inspection (ASCD Brake Switch)"

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace ASCD brake switch.

8.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect stop lamp switch harness connector.

3.

Check the voltage between stop lamp switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 9.

9.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E103
• 10 A fuse (No. 7)
• Harness for open or short between stop lamp switch and battery

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

10.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check the continuity between stop lamp switch harness connector and ECM harness connector.

3.

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

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connectors E103, M2
• Harness for open or short between ECM and stop lamp switch

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

12.

CHECK STOP LAMP SWITCH

Refer to 

EC-1052, "Component Inspection (Stop Lamp Switch)"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace stop lamp switch.

13.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Stop lamp switch

Ground

Voltage

Connector

Terminal

E110

3

Ground

Battery voltage

Stop lamp switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E110

4

M160

110

Existed

EC-1052

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P1572 ASCD BRAKE SWITCH

Component Inspection (ASCD Brake Switch)

INFOID:0000000005237545

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.

Component Inspection (Stop Lamp Switch)

INFOID:0000000005237546

1.

CHECK STOP LAMP SWITCH-I

1.

Turn ignition switch OFF.

2.

Disconnect stop lamp switch harness connector.

3.

Check the continuity between stop lamp switch terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

CHECK STOP LAMP SWITCH-II

1.

Adjust stop lamp switch installation. Refer to 

BR-7, "Inspection and Adjustment"

.

2.

Check the continuity between stop lamp switch terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace stop lamp switch.

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

Terminals

Condition

Continuity

3 and 4

Brake pedal

Fully released

Not existed

Slightly depressed

Existed

Terminals

Condition

Continuity

3 and 4

Brake pedal

Fully released

Not existed

Slightly depressed

Existed

 

 

 

 

 

 

 

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