C1262

Diagnostic Chart - Part 1 0f 2:

Diagnostic Chart - Part 2 0f 2:

Schematic Diagram:

CIRCUIT DESCRIPTION
The Electronic Brake/Traction Control Module (EBCM/EBTCM) monitors brake pedal position using the TCC/antilock brake switch. The normally closed switch opens when the brake pedal is depressed approximately 40% down. The EBCM/EBTCM also monitors pump motor operation using a pump motor run sensor.

During most ABS braking conditions the EBCM/EBTCM turns ON the pump motor, replenishing the Brake Pressure Modulator Valve (BPMV) reservoir and applying pressure to the master cylinder. This causes the brake pedal to gradually rise. The EBCM/EBTCM turns OFF the pump motor when the brake pedal height sufficiently rises to close the TCC/antilock brake switch.

CONDITIONS FOR SETTING THE DTC
During ABS braking, DTC C1262 sets when the EBCM/EBTCM determines the pump is working, and brake pedal height has not sufficiently risen to close the TCC/antilock brake switch after 3 seconds.

This DTC may indicate a hydraulic problem. Some possible causes include air in the brake 1ines or a pump motor mechanical failure. Non-hydraulic causes for DTC C1262 include an open 848 or 853 CKT or a misadjusted/defective TCC/antilock brake switch.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored, ABS is disabled and the ANTILOCK indicator lamp is turned ON.

CONDITIONS FOR CLEARING THE DTC
^ Conditions for the malfunction are no longer present and scan tool clear DTCs function is used.

^ 100 ignition switch key cycles have passed with no malfunctions detected.

DIAGNOSTIC AIDS
Possible Causes:
- Malfunctioning TCC/Antilock Switch.
- Malfunctioning ABS Pump Relay or Main Relay.

It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully inspect wiring may result in misdiagnosis, causing part replacement with reappearance of the malfunction.