P0594

Test 1:

Tests 2 - 4:

Tests 5 - 8:

SYMPTOM
P0594-SPEED CONTROL SERVO POWER CIRCUIT

WHEN MONITORED
With the ignition key ON. The speed control switched ON.

SET CONDITION
The PCM detects a open or shorted in the Speed Control Power Supply circuit. One Trip Fault.

POSSIBLE CAUSES
- Intermittent condition
- Speed control source circuit
- S/C brake switch output circuit shorted to ground
- S/C source circuit shorted to ground
- Brake lamp switch
- S/C brake switch output circuit open
- PCM (S/C source circuit)