Diagnosis Procedure

ASCD BRAKE SWITCH


Description

When the brake pedal is depressed, ASCD brake switch is turned OFF and stop lamp switch is turned ON.
ECM detects the state of the brake pedal by those two types of input (ON/OFF signal). System Description for the ASCD function.





ASCD BRAKE SWITCH


Diagnosis Procedure

1.INSPECTION START
Check which type of transmission the vehicle is equipped with.
Which type of transmission?
A/T models or M/T models and synchrorev match mode-GO TO 2.
M/T models without synchrorev match mode-GO TO 7.
2.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 4.
NO - GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
- Fuse block (J/B) connector E103
- 10 A fuse (No. 3)
- Harness for open or short between ASCD brake switch and fuse
- Repair open circuit or short to ground in harness or connectors.
4.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 6.
NO - GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E106, M6
- Harness for open or short between ECM and ASCD brake switch
- Repair open circuit, short to ground or short to power in harness or connectors.
6.CHECK ASCD BRAKE SWITCH
Component Inspection (ASCD Brake Switch)
Is the inspection result normal?
YES - GO TO 15.
NO - Replace ASCD brake switch.
7.CHECK ASCD BRAKE SWITCH 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 12.
NO - GO TO 8.
8.CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect clutch pedal position switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between clutch pedal position 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.
- Fuse block (J/B) connector E103
- 10 A fuse (No. 3)
- Harness for open or short between clutch pedal position switch and fuse
- Repair open circuit or short to ground in harness or connectors.
10.CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check the continuity between clutch position switch harness connector and ASCD brake switch harness connector.





3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - GO TO 11.
NO - Repair open circuit, short to ground or short to power in harness or connectors.
11.CHECK CLUTCH PEDAL POSITION SWITCH
Component Inspection (Clutch Pedal Position Switch).
Is the inspection result normal?
YES - GO TO 15.
NO - Replace clutch pedal position switch.
12.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 14.
NO - GO TO 13.
13.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E106, M6
- Harness for open or short between ECM and ASCD brake switch
- Repair open circuit, short to ground or short to power in harness or connectors.
14.CHECK ASCD BRAKE SWITCH
Component Inspection (ASCD Brake Switch).
Is the inspection result normal?
YES - GO TO 15.
NO - Replace ASCD brake switch.
15.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
- INSPECTION END