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For California


DTC P1572 ASCD BRAKE SWITCH





Component Description





When the brake pedal is depressed, ASCD brake switch (1) is turned OFF and stop lamp switch (2) is turned ON. ECM detects the state of the brake pedal (3) by this input of two kinds (ON/OFF signal). For California for the ASCD function.




CONSULT-III 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 self-diagnosis.

NOTE:
- If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. For California.
- 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 5 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.
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.
If 1st trip DTC is detected, go to For California.
If 1st trip DTC is not detected, go to the following step.
5. Drive the vehicle for at least 5 consecutive seconds under the following condition.





6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to For California.




Wiring Diagram

EC-ASC/BS-01:





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-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 voltage between ECM terminal 100 and ground under the following conditions.










OK or NG
OK - GO TO 2.
NG - GO TO 3.
2.CHECK OVERALL FUNCTION-II
With CONSULT-III
Check "BRAKE SW2" indication in "DATA MONITOR" mode.





Without CONSULT-III





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 BRAKE SWITCH POWER SUPPLY
1. Turn ignition switch OFF.





2. Disconnect ASCD brake switch (1) harness connector.
- Stop lamp switch (2)
- Brake pedal (3)
3. Turn ignition switch ON.





4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-III or tester.

Voltage : Battery voltage

OK or NG
OK - GO TO 8.
NG (M/T models)-GO TO 4.
NG (CVT models)-GO TO 6.
4.CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.





2. Disconnect ASCD clutch switch (1) harness connector.
- Clutch pedal (2)
3. Turn ignition switch ON.





4. Check voltage between ASCD clutch switch terminal 1 and ground with CONSULT-III or tester.

Voltage : Battery voltage

OK or NG
OK - GO TO 7.
NG - GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
- 10 A fuse
- Harness for open or short between ASCD clutch switch and fuse
- Repair open circuit or short to ground or short to power in harness or connectors.
6.DETECT MALFUNCTIONING PART
Check the following.
- 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.
7.CHECK ASCD CLUTCH SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between ASCD brake switch terminal 1 and ASCD clutch 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 10.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
8.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 9.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
9.CHECK ASCD BRAKE SWITCH
For California.
OK or NG
OK - GO TO 15.
NG - Replace ASCD brake switch.
10.CHECK ASCD CLUTCH SWITCH
For California
OK or NG
OK - GO TO 15.
NG - Replace ASCD clutch switch.
11.CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.





2. Disconnect stop lamp switch (2) harness connector.
- ASCD brake switch (1)
- Brake pedal (3)
3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT -III or tester.






Voltage : Battery voltage

OK or NG
OK - GO TO 13.
NG - GO TO 12.
12.DETECT MALFUNCTIONING PART
Check the following.
- 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
For California
OK or NG
OK - GO TO 15.
NG - Replace stop lamp switch.
15.CHECK INTERMITTENT INCIDENT
For California For California.
- 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, Inspection and Adjustment, 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.

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, Inspection and Adjustment, and perform step 3 again.
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