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P0579-SPEED CONTROL SWITCH 1 PERFORMANCE (5.7L) (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes (V37) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE (V37) S/C SWITCH NO.1 SIGNAL CIRCUIT OPEN (V937) SWITCH RETURN CIRCUIT OPEN (V37) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO GROUND (V37) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO THE (V937) SWITCH RETURN CIRCUIT CLOCKSPRING SPEED CONTROL SWITCH PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. SPEED CONTROL SWITCH STATUS Start the engine. With a scan tool, monitor each which function for the Speed Control Switches. Notice the voltage reading when no buttons are pressed. Press and release each Speed Control Button. - Resume/Accel - Cancel - Decel (Coast) - On/Off - Set Does each switch function change status when pressing and then depressing each switch? Yes >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 2 HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 607 |