DTC C1446 (MZR-CD (RF Turbo)) [DYNAMIC STABILITY CONTROL (DSC)]

id0402b2811100

DTC

C1446

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 {12.4 mph} or more.

•  Brake switch ON signal is not input even though the DSC HU/CM determines vehicle deceleration.

POSSIBLE CAUSE

•  Open or short circuit in the wiring harness between brake switch and the terminal on the PJB

•  Open or short circuit in the wiring harness between the terminals on the PJB and PCM

•  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 following PCM terminals and body ground when the brake pedal is depressed and released: ― PCM: 100—Body ground Voltage Brake pedal depressed: B+ Brake pedal released: 1 V or less	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 following PCM connector terminals (vehicle harness-side) and brake switch terminal D: ― PCM: 100 • 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 [EXCEPT MZ-CD 1.6 (Y6)].) • 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 [EXCEPT MZ-CD 1.6 (Y6)].)
5	VERIFY THAT THE SAME DTC IS NOT PRESENT • Reconnect all disconnected connectors. • Clear the DTCs from the memory. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) • Start the engine and drive the vehicle at 20 km/h {12.4 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 [DYNAMIC STABILITY CONTROL (DSC)].)
6		No	DTC troubleshooting completed.

DTC	C1446		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 {12.4 mph} or more. • Brake switch ON signal is not input even though the DSC HU/CM determines vehicle deceleration.
POSSIBLE CAUSE		• Open or short circuit in the wiring harness between brake switch and the terminal on the PJB • Open or short circuit in the wiring harness between the terminals on the PJB and PCM • Brake switch malfunction • Poor connection at connectors (female terminal)