With 4 Speed Automatic

Circuit Description
The brake switch indicates brake pedal status to the PCM. The normally-closed brake switch supplies battery voltage on circuit 420 to the PCM. Applying the brake pedal opens the switch, interrupting voltage to the PCM. Releasing the brake pedal resumes voltage to the PCM. When the PCM senses 0 volts at the brake switch input, the PCM de-energizes the torque converter clutch (TCC) solenoid 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 (stuck ON) during accelerations, then DTC P0719 sets. DTC P0719 is a type D DTC.

Conditions for Running the DTC
^ The ignition switch is in the RUN position.
^ The system voltage is 8-18 volts.

Conditions for Setting the DTC
DTC P0719 sets if the PCM detects an open brake switch or circuit (0 volts) for 15 minutes and the following conditions occur eight 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 3 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).
^ The PCM stores DTC P0719 in PCM history.

Conditions for Clearing the DTC
^ A scan tool clears the DTC from PCM history.
^ The PCM clears the DTC from PCM history it the vehicle completes 40 consecutive warm-up cycles without a non-emission-related diagnostic fault occurring.
^ The PCM cancels the DTC default actions when the fault no longer exists and the ignition switch is OFF long enough in order to power down the PCM.

Diagnostic Aids
^ If the PCM detects a brake switch circuit fault, then the brake switch input is disregarded for TCC scheduling. The PCM then uses throttle position and vehicle speed inputs to determine TCC application and release. Use of these inputs may result in a noticeable harsh apply or abrupt release of the TCC.
^ Ask about the customer's driving habits. Ask about unusual traffic conditions, and stop-and-go driving.
^ Inspect the brake switch for proper adjustment.
^ Inspect the wiring at the PCM, the brake switch connector and all other circuit connecting points for the following conditions:
- A backed out terminal.
- A damaged terminal.
- Reduced terminal tension.
- A chafed wire.
- A broken wire inside the insulation.
- Moisture intrusion.
- Corrosion.
^ When diagnosing for an intermittent short or open condition, massage the wiring harness while watching the test equipment for a change.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Disconnecting the brake switch connector, jumping the circuit, and observing a status change, isolates the brake switch as the source of the DTC.
3. If circuit 439 shorts to ground, the ERLS fuse opens.
4. If the brake switch is properly adjusted, then the brake switch must be replaced.
5. Replace the PCM only after you have completed the preceding diagnostic steps.