Cruise Control Diagnosis
DTC P0719 (WITH MANUAL TRANSMISSION)
CIRCUIT DESCRIPTION
The cruise release switch is a normally closed switch. The stop lamp switch signal circuit is a normally open switch. When the brake pedal is released, the powertrain control module (PCM) detects a high voltage signal on the torque converter clutch (TCC) brake switch/cruise control release signal circuit and a low signal voltage signal on the stop lamp switch signal circuit.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0719 Brake Switch Circuit Low Voltage
CONDITIONS FOR RUNNING THE DTC
- The engine is ON.
- The traction control system or the antilock brake system are not active and have not failed.
- The vehicle has accelerated from 0 km/h (0 mph) to 60 km/h (37 mph) 3 times in one ignition cycle.
- This diagnostic runs continuously once the conditions for running the DTC has been achieved.
CONDITIONS FOR SETTING THE DTC
When the brake pedal is released, the PCM detects a low voltage signal on the stop lamp switch signal circuit and a low voltage signal on the TCC brake switch/cruise control release signal circuit.
ACTION TAKEN WHEN THE DTC SETS
- The PCM stores the DTC information into memory when the diagnostic runs and fails.
- The malfunction indicator lamp (MIL) will not illuminate.
- The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records.
- The Cruise Control System is disabled.
CONDITIONS FOR CLEARING THE DTC
- A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
- A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
- Use a scan tool in order to clear the DTC.
DIAGNOSTIC AIDS
In order to avoid a misdiagnosis, inspect for proper adjustment of the cruise control release switch.
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics
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