DTC C0040:64 [ANTILOCK BRAKE SYSTEM (ABS)]

id0402b0877500

DTC

C0040:64

Brake switch

DETECTION CONDITION

•  Brake switch ON signal is input for 6 min or more when driving at a vehicle speed of 20 km/h {12 mph} or more.

•  Brake switch ON signal is not input even though the control module determines vehicle deceleration.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

•  Open or short circuit in wiring harness between the brake switch terminal D and PCM terminal 1U

•  Brake switch malfunction

•  Poor connection at connectors (female terminal)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY OPEN OR SHORT CIRCUIT IN BRAKE SWITCH SIGNAL • Switch the ignition to ON. • Measure the voltage between the PCM connector terminal 1U (vehicle harness-side) and body ground when the brake pedal is depressed and released: Voltage Brake pedal depressed: B+ Brake pedal released: 1 V or less • Is the voltage normal?	Yes	Go to Step 5.
1		No	If it is B+ under any condition, then go to the next step. If it is 1 V or less under any condition, then go to Step 3.
2	INSPECT BRAKE SWITCH SIGNAL FOR SHORT TO POWER SUPPLY CIRCUIT • Disconnect the brake switch connector. • Measure voltage between the brake switch connector terminal D (vehicle harness-side) and body ground. • Is the voltage 1 V or less?	Yes	Go to Step 4.
2		No	Repair or replace the wiring harness between the PCM and brake switch, then go to Step 5.
3	INSPECT BRAKE SWITCH SIGNAL FOR OPEN CIRCUIT • Disconnect the PCM connectors. • Disconnect the brake switch connector. • Inspect continuity between the PCM connector terminal 1U (vehicle harness-side) and brake switch terminal D (vehicle harness-side). • Is there continuity?	Yes	Go to the next step.
3		No	Repair or replace the wiring harness between the PCM and brake switch, then go to Step 5.
4	INSPECT BRAKE SWITCH • Inspect the brake switch. (See BRAKE SWITCH INSPECTION.) • Is the brake switch normal?	Yes	Go to the next step.
4		No	Replace the brake switch, then go to the next step. (See BRAKE PEDAL REMOVAL/INSTALLATION [L.H.D.].) (See BRAKE PEDAL REMOVAL/INSTALLATION [R.H.D.].)
5	VERIFY THAT THE SAME DTC IS NOT PRESENT • Reconnect all disconnected connectors. • Clear the DTCs from the memory. (See ON-BOARD DIAGNOSIS [ANTILOCK BRAKE SYSTEM (ABS)].) • Start the engine and drive the vehicle at 20 km/h {12 mph} or more. • Are the same DTCs present?	Yes	Repeat the inspection from Step 1.
5		No	Go to the next step.
6	VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [ANTILOCK BRAKE SYSTEM (ABS)].)
6		No	DTC troubleshooting completed.

DTC	C0040:64		Brake switch
DETECTION CONDITION		• Brake switch ON signal is input for 6 min or more when driving at a vehicle speed of 20 km/h {12 mph} or more. • Brake switch ON signal is not input even though the control module determines vehicle deceleration.
FAIL-SAFE FUNCTION		Not applicable
POSSIBLE CAUSE		• Open or short circuit in wiring harness between the brake switch terminal D and PCM terminal 1U • Brake switch malfunction • Poor connection at connectors (female terminal)