DTC C0040:64 (ZJ, ZY) [ABS] - Mazda Manuals

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DTC C0040:64 (ZJ, ZY) [ABS]

id0402a7888800

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.
POSSIBLE CAUSE •  Open or short circuit in wiring harness between the brake switch terminal D and PCM terminal 1G •  Brake switch malfunction •  Poor connection at connectors (female terminal)

Diagnostic procedure

STEP

INSPECTION

ACTION
1 VERIFY OPEN OR SHORT CIRCUIT IN BRAKE SWITCH SIGNAL •  Turn the ignition switch to the ON position. •  Measure the voltage between the PCM terminal 1G (vehicle harness-side) and body ground when the brake pedal is depressed and released. VoltageBrake pedal depressed: B+ Brake pedal released: 1 V or less Yes Go to Step 5.
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.
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 1G (vehicle harness-side) and brake switch terminal D (vehicle harness-side). •  Is there continuity? Yes Go to the next step.
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 [MTX].) (See BRAKE SWITCH INSPECTION [ATX].) •  Is the brake switch normal? Yes Go to the next step.
No Replace the brake switch, then go to the next step. (See BRAKE PEDAL REMOVAL/INSTALLATION [ZJ, ZY].)
5 VERIFY THAT THE SAME DTC IS NOT PRESENT •  Reconnect all disconnected connectors. •  Clear the DTCs from the memory.(See ON-BOARD DIAGNOSIS [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. If the malfunction recurs, replace the ABS CM, then go to the next step. (See ABS HU/CM REMOVAL/INSTALLATION [L.H.D.].) (See ABS HU/CM REMOVAL/INSTALLATION [R.H.D.].)
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 [ABS].)
No DTC troubleshooting completed.

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