ASCD Brake Switch

ASCD BRAKE SWITCH





Component Description





When depress on the brake pedal, 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)
System Description for the ASCD function.




CONSULT-III Reference Value in Data Monitor Mode
Specification data are reference values.









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-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 (M/T models) -GO TO 3.
NG (A/T and CVT models) -GO TO 4.
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 - INSPECTION END.
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.
- Clutch pedal (2)
3. Turn ignition switch ON.





4. Check voltage between ASCD clutch switch terminal 1 and ground under the following conditions with CONSULT-III 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.
- Stop lamp switch (1)
3. Turn ignition switch ON.





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





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.





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.





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
P1572.
OK or NG
OK - GO TO 15.
NG - Replace ASCD brake switch.
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.





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
P1572
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 (1) harness connector.
- ASCD brake switch (2)
3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-III or tester.










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.





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
P1572.
OK or NG
OK - GO TO 15.
NG - Replace stop lamp switch.
15.CHECK INTERMITTENT INCIDENT
Trouble Diagnosis For Intermittent Incident 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, 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.