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Symptom: P1597-SPEED CONTROL SWITCH ALWAYS LOW When Monitored and Set Condition: P1597-SPEED CONTROL SWITCH ALWAYS LOW When Monitored: With the ignition on and battery voltage above 10.4 volts. Set Condition: The PCM detects voltage below 0.39 volt on the S/C switch signal circuit for at least 2 minutes. POSSIBLE CAUSES INTERMITTENT CONDITION SPEED CONTROL ON/OFF SWITCH SPEED CONTROL RESUME/ACCEL SWITCH SPEED CONTROL SWITCH CONTROL CIRCUIT SHORTED TO SENSOR GROUND SPEED CONTROL SWITCH CONTROL CIRCUIT SHORTED TO GROUND PCM TEST ACTION APPLICABILITY 1 Turn the ignition on. t, read the Speed Control voltage. Is the Speed Control voltage below 1.0 volts? All Yes → No → 2 Turn the ignition on. t, monitor the Speed Control Switch voltage. Disconnect the Speed Control On/Off Switch harness connector. All Yes → Replace the Speed Control On/Off Switch. No → 3 Turn the ignition on. t, monitor the Speed Control Switch voltage. Disconnect the Speed Control Resume/Accel Switch harness connector. All Yes → Replace the Speed Control Resume/Accel Switch. No → 284 SPEED CONTROL |