P0719

Circuit Description
The brake switch indicates brake pedal status to the Powertrain Control Module (PCM). The brake switch is a normally closed switch that supplies battery voltage on circuit ORN to the PCM. Applying the brake pedal opens the switch, interrupting voltage to the PCM. Then 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 circuit fault (refer to Diagnostic Aids).
When the PCM detects an open brake switch circuit (0 volts, low input) during Acceleration, then DTC P0719 sets. DTC 0719 is a type D DTC.





Wiring Diagram

Part 1 Of 3:

Part 2 Of 3:

Part 3 Of 3:

Inspection Procedure



Conditions For Setting The DTC
- No OSS Assy. DTCs P0722 or P0723.
- The PCM detects a closed brake switch/circuit (0 volts) for 15 minutes without changing for 2 seconds, and the following events occur seven consecutive times:
- Vehicle speed is less than 8 km/h (5 mph).
- Vehicle speed is between 8 - 32 km/h (5 - 20 mph) for 4 seconds.
- Vehicle speed is greater then 32 km/h (20 mph) for 4 seconds.

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

Conditions For Clearing The DTC
- The scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history is the vehicle completes 40 warm-up cycles without a failure reported.
- The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order 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 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 refer to the step numbers on the diagnostic chart:
3. This test checks for voltage at the brake switch.