DTC C1446 [ABS]

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DTC C1446 [ABS]

B3E040243000W09

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 control module determines vehicle deceleration.
POSSIBLE CAUSE | • Open or short circuit in wiring harness between the brake switch and PJB terminal • Open or short circuit in wiring harness between the PJB and PCM terminals • 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 (ZJ, Z6): 1V-Body ground
  - PCM (LF): 1AU-Body ground
  Voltage
  Brake 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 following PCM connector terminals (vehicle harness-side) and brake switch terminal D:

  - PCM (ZJ, Z6): 1V
  - PCM (LF): 1AU

• 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.) • 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.)

5

VERIFY THAT THE SAME DTC IS NOT PRESENT
• Reconnect all disconnected connectors.
• Clear the DTCs from the memory.
(See Clearing DTCs Procedures.)
• 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.
If the malfunction recurs, replace the ABS HU/CM, then go to the next step.
(See ABS HU/CM REMOVAL/INSTALLATION.)

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 DTC Table.)
No | DTC troubleshooting completed.