P0703

Tests 1 - 2:

Tests 3 - 7:

Tests 8 - 9:

SYMPTOM
P0703-BRAKE SWITCH SENSE CIRCUIT

WHEN MONITORED
With the engine running. The PCM expects the signal to be high for 16 cycles while it monitors the brake switch signal during accel and decel modes.

SET CONDITION
After the vehicle speed increases, the PCM must accumulate 6 seconds while delta throttle voltage is above 0.02 volts. The count is reset to zero whenever the brake switch indicates a low signal.

POSSIBLE CAUSES
- Intermittent condition
- Fused B+ circuit
- Brake switch sense circuit shorted to voltage
- Brake switch sense shorted to ground
- Brake switch sense circuit open
- Ground circuit open
- Brake lamp switch operation
- PCM