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Symptom: P0581-SPEED CONTROL SWITCH #1 HIGH When Monitored and Set Condition: P0581-SPEED CONTROL SWITCH #1 HIGH When Monitored: With the ignition key on. Battery voltage above 10 volts. Set Condition: The PCM detects an open or short to voltage in the Speed Control Switch Signal circuit. One Trip Fault. POSSIBLE CAUSES SPEED CONTROL SWITCH VOLTAGE HIGH SPEED CONTROL SWITCH (V37) S/C SWITCH SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE (K4) SENSOR GROUND OPEN PCM TEST ACTION APPLICABILITY 1 Ignition on, engine not running. t in Sensors, read the S/C Switch Volts. Is the Speed Control voltage above 4.8 volt? All Yes → Go To 2 No → Refer to the INTERMITTENT CONDITION symptom in the Driveability category. 2 Turn the ignition off. t in Sensors, monitor the S/C Switch Volts. With the S/C Switch disconnected, the S/C Switch Volts should equal 5.0 volts. t as described? All Yes → Go To 3 No → Replace the Speed Control Switch. Perform POWERTRAIN VERIFICATION TEST VER - 4. 446 DRIVEABILITY - NGC |