ASCD Brake Switch
P1572 ASCD BRAKE SWITCH
DTC Logic
DTC DETECTION LOGIC
NOTE:
-If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. For USA And Canada.
-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 is turned OFF. And even when malfunction A is detected in two consecutive trips, DTC is not stored in ECM memory.
DTC CONFIRMATION PROCEDURE
1. PRECONDITIONING
1.Turn ignition switch OFF and wait at least 10 seconds.
2.Turn ignition switch ON.
3.Turn ignition switch OFF and wait at least 10 seconds.
NOTE:
The procedure for malfunction B is not described. It takes an extremely long time to complete the procedure for malfunction B. By performing the procedure for malfunction A, the condition that causes malfunction B can be detected.
- GO TO 2.
2. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
1.Start engine (VDC switch OFF).
2.Press MAIN switch and check that CRUISE indicator is displayed in combination meter.
3.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.
4.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Go to .
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 .
NO- INSPECTION END
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 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
Select "BRAKE SW-2" and check indication under the following conditions.
WITHOUT CONSULT
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.
- 10 A fuse (No. 3)
- Harness for open or short between ASCD brake switch and fuse
- Loose or poor connection for each connector and harness
- 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 for open or short between ECM and ASCD brake switch
- Loose or poor connection for each connector and harness
- Repair open circuit, short to ground or short to power in harness or connectors.
7. CHECK 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.
- 10 A fuse (No. 7)
- Harness for open or short between stop lamp switch and battery
- Loose or poor connection for each connector and harness
- 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.
- Harness for open or short between ECM and stop lamp switch
- Loose or poor connection for each connector and harness
- Repair open circuit, short to ground or short to power in harness or connectors.
12. CHECK STOP LAMP SWITCH
.
Is the inspection result normal?
YES- GO TO 13.
NO- Replace stop lamp switch.
13. CHECK INTERMITTENT INCIDENT
Intermittent Incident.
- INSPECTION END
Component Inspection (ASCD Brake Switch)
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. Adjustments.
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. Removal And Installation.
Component Inspection (Stop Lamp Switch)
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. Adjustments.
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. Removal And Installation.