P1572
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
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.
1. PRECONDITIONING
- Turn power switch OFF and wait at least 20 seconds.
- Make sure that 12V battery voltage is 11 V or more.
- GO TO 2.
2. PERFORM DTC CONFIRMATION PROCEDURE-I
With CONSULT
1.Turn power switch ON (VDC switch OFF).
2.On the CONSULT screen, select "EV/HEV" - "DATA MONITOR" - "VEHICLE SPEED" and "GEAR
POSITION".
3.Press ASCD MAIN switch and check that CRUISE lamp illuminates.
4.Drive the vehicle for at least 5 consecutive seconds under the following conditions.
CAUTION:
Always drive vehicle at a safe speed.
5.Check self-diagnostic result.
Is DTC detected?
YES- Proceed to "Diagnosis Procedure" .
NO- GO TO 3.
3. PERFORM DTC CONFIRMATION PROCEDURE-II
With CONSULT
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 self-diagnostic result.
Is DTC detected?
YES- Proceed to "Diagnosis Procedure" .
NO- INSPECTION END
Diagnosis Procedure
1. CHECK OVERALL FUNCTION-I
With CONSULT
1.Turn power switch ON.
2.On the CONSULT screen, select "EV/HEV" - "DATA MONITOR" - "ASCD BRAKE SW".
3.Check "ASCD BRAKE SW" indication under the following conditions.
Is the inspection result normal?
YES- GO TO 7.
NO- GO TO 2.
2. CHECK ASCD BRAKE SWITCH POWER SUPPLY
1.Turn power switch OFF.
2.Disconnect ASCD brake switch harness connector.
3.Turn power switch ON.
4.Check the voltage between ASCD brake switch harness connector and ground.
Is the inspection result normal?
YES- GO TO 4.
NO- GO TO 3.
3. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1.Turn power switch OFF.
2.Pull out #3 fuse.
3.Check the continuity between ASCD brake switch harness connector and fuse terminal.
4.Also check harness for short to ground.
Is the inspection result normal?
YES- Check power supply circuit for power ON power supply.
NO- Repair or replace error-detected parts.
4. CHECK ASCD BRAKE SWITCH SIGNAL
1.Turn power switch OFF.
2.Reconnect ASCD brake switch harness connector.
3.Disconnect VCM harness connector.
4.Turn power switch ON.
NOTE:
Brake pedal is fully released.
5.Check the voltage between VCM harness connector and ground.
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- GO TO 5.
5. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.Turn ignition switch OFF.
2.Disconnect ASCD brake switch harness connector.
3.Check the continuity between ASCD brake switch harness connector and VCM harness connector.
4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 6.
NO- Repair or replace error-detected parts.
6. CHECK ASCD BRAKE SWITCH
Refer to "Component Inspection (ASCD Brake Switch)"
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace ASCD brake switch. Refer to "Exploded View" Exploded View.
7. CHECK OVERALL FUNCTION-II
With CONSULT
Select "STOP LAMP SW" and check indication under the following conditions.
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- GO TO 8.
8. CHECK STOP LAMP SWITCH POWER SUPPLY
1.Turn power 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. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1.Pull out #38 fuse.
2.Check the continuity between stop lamp switch harness connector and fuse terminal.
3.Also check harness for short to ground.
Is the inspection result normal?
YES- Check power supply circuit for battery power supply.
NO- Repair or replace error-detected parts.
10. CHECK STOP LAMP SWITCH SIGNAL
1.Turn power switch OFF.
2.Reconnect stop lamp switch harness connector.
3.Disconnect VCM harness connector.
4.Depress the brake pedal.
5.Check the voltage between VCM harness connector and ground.
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- GO TO 11.
11. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT
1.Disconnect stop lamp switch harness connector.
2.Check the continuity between stop lamp switch harness connector and VCM harness connector.
3.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 12.
NO- Repair or replace error-detected parts.
12. CHECK STOP LAMP SWITCH
Refer to "Component Inspection (Stop Lamp Switch)"
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace stop lamp switch. Refer to "Exploded View" Exploded View.
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. Refer to "Inspection and Adjustment" 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. Refer to "Exploded View" Exploded View.
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. Refer to "Inspection and Adjustment" 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. Refer to "Exploded View" Exploded View.