P0719

Diagnostic Chart:

Diagnostic Chart (cont'd):

Wiring Diagram:

Circuit Description
The brake switch indicates the brake petal status. The normally-closed brake switch supplies a B+ signal on circuit 420 to the PCM. The signal voltage circuit opens when the brakes are applied. When 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) DTC P0722 or P0723.
^ The PCM detects an open brake switch/circuit (0 volts) for 15 minutes without going off for 2 seconds.
^ 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 8-32 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

^ The PCM does not illuminate the Malfunction Indicator Lamp (MIL).
^ For TCC scheduling, the PCM disregards the brake switch state it the Throttle Position (TP) Sensor is greater than 12% and the vehicle speed is greater than 40 mph.

Conditions for Clearing the DTC

^ The PCM turns OFF the MIL after three consecutive ignition cycles without a failure reported.
^ A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history it 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 Inspect the wiring for poor electrical connections at the TCC brake switch. Look for the following conditions:

- 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 open condition, massage the wiring harness while watching the test equipment for a change.
^ Ask about the customer's driving habits and any unusual driving conditions he or she might have, such as stop and go traffic or expressway driving.
^ Inspect the break switch for proper mounting and adjustment.
^ Inspect for the most current calibration I.D. and the latest bulletins.
^ First diagnose and clear any engine DTCs or Accelerator Pedal Position (APP) Sensor codes that are present. Then inspect for any transmission DTCs that may have reset.

Test Description
The numbers below refer to the step numbers on the diagnostic table.

2. This step isolates the brake switch as a source for setting the DTC.