P0719
DTC P0719 (4.2L)
Circuit Description
The stop lamp switch is used to sense the action of the driver application of the brake pedal. The stop lamp switch is a normally open switch that, when applied, provides a B+ analog voltage to the transmission control module (TCM).
When the TCM detects an open stop lamp switch circuit, 0-volts, during a calibrated number of decelerations, then DTC P0719 sets. DTC P0719 is a type C DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0719 Brake Switch Circuit Low Voltage
Conditions for Running the DTC
- No vehicle speed sensor (VSS) DTCs P0502 or P0503.
- Brake switch status is open and DTC P0719 has not passed.
Conditions for Setting the DTC
The PCM detects an open brake switch or circuit, 0 volts, for 15 minutes without changing for 2 seconds, and the following events occur 8 times:
1. The vehicle speed is less than 8 km/h (5 mph).
2. The vehicle speed is 8-32 km/h (5-20 mph) for 4 seconds.
3. 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 disregards the brake switch input for TCC scheduling.
- The PCM freezes transmission adaptive functions.
- The PCM uses throttle position and vehicle speed to determine application and release of the TCC.
- The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records.
- The PCM stores DTC P0719 in PCM history.
Conditions for Clearing the DTC
- A scan tool can clear the DTC.
- The PCM clears the DTC from PCM history if the vehicle completes 40 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/or the ignition switch is OFF long enough in order to power down the PCM.
Diagnostic Aids
Inspect for ABS DTCs. A faulty ABS condition may contribute to setting DTC P0719.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. This step isolates the brake switch as a source for setting the DTC.
