P0719

Circuit Description
The TCC brake switch is used to indicate brake pedal status. The normally opened brake switch signal voltage circuit is opened.
Brake switch supplies a B+ signal on circuit RED to the PCM, when the brakes are applied. The PCM uses this signal to deenergize the TCC solenoid when the brakes are applied.
This DTC detects a closed brake switch during accelerations. This is a type "D" DTC.

Conditions For Setting The DTC
- No OSS DTCs P0722 or P0723.
- The PCM detects a closed brake switch/circuit (12 volts) for 2 seconds, and the following events occur seven consecutive times: vehicle speed is less than 8 km/h (5 mph); then vehicle speed is between 8 and 32 km/h (5 and 20 mph) for 4 seconds; then vehicle speed is greater than 32 km/h (20 mph) for 4 seconds.

Action Taken When The DTC Sets
- If throttle opening is greater than 10% and vehicle speed is greater than 45 km/h (28 mph), then disregard brake switch contingency for TCC off mode.
- The PCM will not illuminate Malfunction Indicator Lamp (MIL).

Conditions For Clearing The DTC
- The DTC can be cleared from the PCM history by using a scan tool.
- The DTC will be cleared from history when the vehicle has achieved 40 warm-up cycles without a failure reported.
- The PCM will cancel the DTC default actions when the fault no longer exists and the ignition is cycled OFF' long enough to power down the PCM.

Diagnostic Aids
- Inspect the wiring for poor electrical connections at the PCM and TCC brake switch. Look for possible bent, backed out, deformed or damaged terminals. Check for weak terminal tension as well. Also check for a chafed wire that could short to bare metal or other wiring. Inspect for a broken wire inside the insulation.
- When diagnosing for a possible intermittent short or open condition, move or massage the wiring harness while observing test equipment for a change.
- Check customer driving habits and/or unusual driving conditions (i.e. stop and go, highway).
- Check brake switch for proper mounting and adjustment.

Test Description
The numbers below refer to the step numbers on the diagnostic chart:
3. This test checks for voltage at the brake switch.
6. This test checks the brake switch.
9. This test checks circuit RED at the PCM.








DTC P0719 TCC Brake switch circuit High (Stuck On)