Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnosis Procedure
- CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT-I
- Turn ignition switch OFF.
- Disconnect ASCD brake switch harness connector.
- Turn ignition switch ON.
- Check the voltage between ASCD brake switch harness connector and ground.
ASCD brake switch Ground Voltage Connector Terminal E112 1 Ground Battery voltage Is the inspection result normal?
YES >> GO TO 7.
NO-1 >> CVT models: GO TO 2.
NO-2 >> M/T models: GO TO 3.
- DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E105, M77
- 10 A fuse (No. 2)
- 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.
- CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect ASCD clutch switch harness connector.
- Turn ignition switch ON.
- Check the voltage between ASCD clutch switch harness connector and ground.
ASCD clutch switch Ground Voltage Connector Terminal E111 3 Ground Battery voltage Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
- DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E105, M77
- 10 A fuse (No. 2)
- 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.
- CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT-II
- Turn ignition switch OFF.
- Disconnect ASCD brake switch harness connector.
- Check the continuity between ASCD clutch switch harness connector and ASCD brake switch harness connector.
ASCD clutch switch ASCD brake switch Continuity Connector Terminal Connector Terminal E111 4 E112 1 Existed - Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
- CHECK ASCD CLUTCH SWITCH
Refer to "Component Inspection (ASCD Clutch Switch) ".
Is the inspection result normal?
YES >> GO TO 9.
NO >> Replace ASCD clutch switch. Refer to "EXPLODED VIEW ".
- CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between ASCD brake switch harness connector and ECM harness connector.
ASCD brake switch ECM Continuity Connector Terminal Connector Terminal E112 2 E16 100 Existed - Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
- CHECK ASCD BRAKE SWITCH
Refer to "Component Inspection (ASCD Brake Switch) ".
Is the inspection result normal?
YES >> GO TO 9.
NO >> Replace ASCD brake switch. Refer to "EXPLODED VIEW ".
- CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".
>> INSPECTION END
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.