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Home >> Nissan-Datsun >> 2012 >> Frontier 2WD L4-2.5L (QR25DE) >> Repair and Diagnosis >> Cruise Control >> Testing and Inspection >> ASCD Brake Switch
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ASCD Brake Switch




ASCD BRAKE SWITCH

Component Description






When depress on the brake pedal, ASCD brake switch is turned
OFF and stop lamp switch is turned ON. ECM detects the state of the brake pedal by this those two types of input (ON/OFF signal)
Refer to the ASCD function.


Diagnosis Procedure


A/T MODELS


1. CHECK OVERALL FUNCTION-I

With CONSULT
1.Turn ignition switch ON.
2.Select "BRAKE SW-1" in "DATA MONITOR" mode with CONSULT.
3.Check "BRAKE SW-1" indication under the following conditions.





Without CONSULT
1.Turn ignition switch ON.





2.Check voltage between ECM terminal 108 and ground under the following conditions.





OK or NG
OK- INSPECTION END.
NG- GO TO 2.

2. 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 voltage between ASCD brake switch terminal 1 and ground with CONSULT or tester.
Voltage: Battery voltage
OK or NG
OK- GO TO 4.
NG- GO TO 3.

3. DETECT MALFUNCTIONING PART

Check the following.
- Fuse block (J/B) connector E160
- 10A fuse (No.12)
- Harness for open or short between ASCD brake switch and fuse
- Repair open circuit or short to ground in harness or connectors.

4. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
4.Also check harness for short to ground and short to power.
OK or NG
OK- GO TO 5.
NG- Repair open circuit, short to ground or short to power in harness or connectors.

5. CHECK ASCD BRAKE SWITCH

.
OK or NG
OK- GO TO 6.
NG- Replace ASCD brake switch. Exploded View.

6. CHECK INTERMITTENT INCIDENT

Intermittent Incident.
-INSPECTION END

M/T MODELS


1. CHECK OVERALL FUNCTION-I

With CONSULT
1.Turn ignition switch ON.
2.Select "BRAKE SW-1" in "DATA MONITOR" mode with CONSULT.
3.Check "BRAKE SW-1" indication under the following conditions.





Without CONSULT
1.Turn ignition switch ON.





2.Check voltage between ECM terminal 108 and ground under the following conditions.





OK or NG
OK- INSPECTION END.
NG- GO TO 2.

2. CHECK ASCD BRAKE SWITCH CIRCUIT

1.Turn ignition switch OFF.





2.Disconnect ASCD clutch switch harness connector.
3.Turn ignition switch ON.





4.Check voltage between ASCD clutch switch terminal 1 and ground under the following conditions with CONSULT or tester.





OK or NG
OK - GO TO 7.
NG- GO TO 3.

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 voltage between ASCD brake switch terminal 1 and ground with CONSULT or tester.
Voltage: Battery voltage
OK or NG
OK- GO TO 5.
NG- GO TO 4.

4. DETECT MALFUNCTIONING PART

Check the following.
- Fuse block (J/B) connector E160
- 10A fuse (No.12)
- Harness for open or short between ASCD brake switch and fuse
- Repair open circuit, short to ground or short to power in harness or connectors.

5. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.Turn ignition switch OFF.
2.Check harness continuity between ASCD brake switch terminal 2 and ASCD clutch switch terminal 1.
Refer to Wiring Diagram.
Continuity should exist.
3.Also check harness for short to ground and short to power.
OK or NG
OK- GO TO 6.
NG- Repair open circuit, short to ground or short to power in harness or connectors.

6. CHECK ASCD BRAKE SWITCH

P1572.
OK or NG
OK - GO TO 9.
NG- Replace ASCD brake switch. Exploded View.

7. CHECK ASCD CLUTCH SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check harness continuity between ECM terminal 108 and ASCD clutch switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
4.Also check harness for short to ground and short to power.
OK or NG
OK- GO TO 8.
NG- Repair open circuit, short to ground or short to power in harness or connectors.

8. CHECK ASCD CLUTCH SWITCH

P1572.
OK or NG
OK- GO TO 9.
NG- Replace ASCD clutch switch. Exploded View.

9. CHECK INTERMITTENT INCIDENT

Intermittent Incident.
-INSPECTION END


Component Inspection


ASCD BRAKE SWITCH

1.Turn ignition switch OFF.
2.Disconnect ASCD brake switch harness connector.





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





If NG, adjust ASCD brake switch installation, and perform step 3 again.

ASCD CLUTCH SWITCH

1.Turn ignition switch OFF.
2.Disconnect ASCD clutch switch harness connector.





3.Check continuity between ASCD clutch switch terminals 1 and 2
under the following conditions.





If NG, adjust ASCD clutch switch installation, Adjustments, and perform step 3 again.
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