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Home >> Nissan-Datsun >> 2012 >> Versa Hatchback L4-1.8L (MR18DE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P1572

P1572




DTC P1572 ASCD BRAKE SWITCH

Component Description






When the brake pedal is depressed, ASCD brake switch (2) is turned OFF and stop lamp switch (1) is turned ON. ECM detects the state of the brake pedal by this input of two kinds (ON/OFF signal).
Refer to Description and Operation for the ASCD function.


CONSULT Reference Value in Data Monitor Mode

Specification data are reference values.







On Board Diagnosis Logic

This self-diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis.

NOTE:
-If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
-This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.
1st trip DTC is erased when ignition switch OFF. And even when malfunction A is detected in two consecutive trips, DTC is not stored in ECM memory.







DTC Confirmation Procedure


CAUTION:
Always drive vehicle at a safe speed.
NOTE:
- If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
- Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for malfunction B. By performing procedure for malfunction A, the incident that causes malfunction B can be detected.

TESTING CONDITION:
Steps 3 and 6 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.

WITH CONSULT

1.Start engine.
2.Press MAIN switch and make sure that CRUISE indicator lights up.
3.Drive the vehicle for at least 5 consecutive seconds under the following condition.





4.Check 1st trip DTC.
5.If 1st trip DTC is detected, go to .
If 1st trip DTC is not detected, go to the following step.
6.Drive the vehicle for at least 5 consecutive seconds under the following condition.





7.Check 1st trip DTC.
8.If 1st trip DTC is detected, go to .

WITH GST

Follow the procedure "WITH CONSULT" above.


Wiring Diagram






Specification data are reference values and are measured between each terminal and ground.

CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.







Diagnosis Procedure


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 100 and ground under the following conditions.









OK or NG
OK- GO TO 2.
NG (M/T models) -GO TO 3.
NG (A/T and CVT models) -GO TO 4.

2. CHECK OVERALL FUNCTION-II

With CONSULT
Check "BRAKE SW-2" indication in "DATA MONITOR" mode.





Without CONSULT





Check voltage between ECM terminal 99 and ground under the following conditions.





OK or NG
OK- GO TO 15.
NG- GO TO 11.

3. CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.





2.Disconnect ASCD clutch switch (1) 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 9.
NG- GO TO 4.

4. CHECK ASCD BRAKE SWITCH POWER SUPPLY

1.Turn ignition switch OFF.





2.Disconnect ASCD brake switch (2) 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 (M/T models) -GO TO 6.
OK (A/T and CVT models) -GO TO 7.
NG- GO TO 5.

5. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors M69, E7
- 10 A fuse
- Harness for open or short between ASCD brake switch and fuse
- Repair open circuit or short to ground or short to power in harness or connectors.

6. 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 8.
NG- Repair open circuit or short to ground or short to power in harness or connectors.

7. 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 100 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 8.
NG- Repair open circuit or short to ground or short to power in harness or connectors.

8. CHECK ASCD BRAKE SWITCH

.
OK or NG
OK- GO TO 15.
NG- Replace ASCD brake switch. Removal And Installation.

9. 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 100 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 10.
NG- Repair open circuit or short to ground or short to power in harness or connectors.

10. CHECK ASCD CLUTCH SWITCH


OK or NG
OK- GO TO 15.
NG- Replace ASCD clutch switch. Service and Repair.

11. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.





2.Disconnect stop lamp switch (1) harness connector.





3.Check voltage between stop lamp switch terminal 1 and ground with CONSULT or tester.





Voltage: Battery voltage
OK or NG
OK- GO TO 13.
NG- GO TO 12.

12. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors M69, E7
- 10 A fuse
- 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.

13. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.Disconnect ECM harness connector.
2.Check harness continuity between ECM terminal 99 and stop lamp switch terminal 2.
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 14.
NG- Repair open circuit or short to ground or short to power in harness or connectors.

14. CHECK STOP LAMP SWITCH


OK or NG
OK- GO TO 15.
NG- Replace stop lamp switch. Removal And Installation.

15. CHECK INTERMITTENT INCIDENT

Refer to Trouble Diagnosis For 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, and perform step 3 again.

STOP LAMP SWITCH

1.Turn ignition switch OFF.
2.Disconnect stop lamp switch harness connector.
3.Check continuity between stop lamp switch terminals 1 and 2 under the following conditions.










If NG, adjust stop lamp switch installation, and perform step 3 again.
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