P0719

Diagnostic Chart:

Wiring Diagram:

Circuit Description

The Torque Converter Clutch (TCC)/Shift Interrupt switch indicates the status of the brake pedal. This normally-closed switch within the Brake Switch Assembly, supplies a B+ signal on the circuit 583 to the PCM. Applying the brake pedal opens the signal voltage circuit. The PCM de-energizes the TCC Solenoid Valve when the PCM receives the signal.

If the PCM detects an open brake switch during accelerations, then DTC P0719 sets. DTC P0719 is a type D DTC.

Conditions for Setting the DTC
- No Vehicle speed Sensor (VSS) DTCs P0502 or P0503.
- The PCM detects an open TCC/Shift Interrupt switch/circuit (0 volts) for 15 minutes without going off for 2 seconds, and the following sequence of events occurs seven consecutive times:

- The vehicle speed is less than 8 km/h (5 mph);
- Then the vehicle speed is 832 km/h (5-20 mph) for 4 seconds;
- Then the vehicle speed is greater than 32 km/h (20 mph) for 6 seconds.

Action Taken When the DTC Sets
If pass conditions are not met, the TP is greater than 5%, and the VSS is greater than 56 km/h (35 mph) after the TP was greater than 10% and the VSS was greater then 64 km/h (40 mph), then the brake switch is disregarded for TCC scheduling. This action occurs before the DTC sets.
- The PCM does not illuminate the Malfunction Indicator Lamp (MIL).

Conditions for Clearing the DTC
- A scan Tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if 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 any poor electrical connections at the PCM. Inspect the wiring at the brake switch assembly. Look for the following problems:
- A bent terminal
- A backed out terminal
- A damaged terminal
- Poor terminal tension
- A chafed wire
- A broken wire inside the insulation
- When diagnosing for an intermittent short or an open, massage the wiring harness while watching the test equipment for changes,
- Ask the customer about the customer's driving habits. Ask it the customer has any unusual driving conditions (e.g. stop-and-go, expressway, etc.).
- Check for the most current calibration ID. Check for the latest bulletins.
- Inspect the brake switch assembly for proper mounting and adjustment.

Test Description

The numbers below refer to the step numbers on the diagnostic chart.
3. This step tests for voltage at the brake switch.
6. This step verifies that the TCC/Shift Interrupt switch is functioning normally.
9. This step verifies that circuit 583 (LT BLU/BLK) is functioning normally at the PCM.