P0719

DTC P0719 Brake Switch Circuit Low (Stuck Off)





Circuit Description
The brake switch is used to indicate brake pedal status to the Powertrain Control Module (PCM). The brake switch is a normally-closed switch that supplies a battery voltage on circuit BRN/RED - GRY/RED to the PCM. Applying the brake pedal opens the switch, interrupting voltage to the PCM. When the brake pedal is released, the PCM receives a constant voltage signal. If the PCM receives a zero voltage signal at the brake switch input, and the Torque Converter Clutch (TCC) is engaged, the PCM de-energizes the Torque Converter Clutch Solenoid Valve (TCC Sol. Valve). The PCM disregards the brake switch input for TCC scheduling if there is a brake switch fault. (Refer to Diagnostic Aids).
When the PCM detects an open brake switch circuit (0 volts, low input) during accelerations, then DTC P0719 sets. DTC P0719 is a type "D" DTC.

Conditions For Setting The DTC
- No OSS DTCs P0722 or P0723.
- The PCM detects an open brake switch or circuit (O volts) for 15 minutes without changing for 2 seconds following events occur seven consecutive times:
Vehicle speed is less than 8 km/h (5 mph).
Vehicle speed is greater than 32 km/h (20 mph) for 4 seconds
Vehicle speed is between 8 and 32 km/h (5 and 20 mph) for 4 seconds

Action Taken When The DTC Sets
- The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
- DTC P0719 stores in PCM history.

Conditions For Clearing The DTC
- A scan tool can clear the DTC from the PCM history.
- The DTC will also be cleared from history when the vehicle has achieved 40 warmup 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 connection at the PCM. 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 the wiring harness while observing test equipment for a change.
- Check customer driving habits and/or unusual traffic conditions (i.e. stop and go, expressway).
- Check brake switch for proper mounting and adjustment.

Test Description
The numbers below refer to the step numbers on the diagnostic chart:
3. This step isolates the brake switch as a source for setting the DTC..

DTC P0719 Brake Switch Circuit Low (Stuck Off)





Step 1





Step 2 - 6





Step 7 - 11