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Symptom: P0594-SPEED CONTROL SERVO POWER CIRCUIT When Monitored and Set Condition: 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 short in the Speed Control Power Supply circuit. One Trip Fault. POSSIBLE CAUSES (V30) S/C BRAKE SWITCH OUTPUT CIRCUIT (V32) S/C POWER SUPPLY CIRCUIT (V30) S/C BRAKE SWITCH OUTPUT CIRCUIT SHORTEDTO GROUND (V32) S/C POWER SUPPLY CIRCUIT SHORTED TO GROUND (V30) S/C BRAKE SWITCH OUTPUT CIRCUIT OPEN BRAKE LAMP SWITCH PCM (S/C SOURCE CIRCUIT) TEST ACTION APPLICABILITY 1 Turn the ignition off. All Yes → Refer to the INTERMITTENT CONDITION symptom in the Driveability category. No → Go To 2 454 DRIVEABILITY - NGC |