For a complete wiring diagram Refer to Section 8WWhen Monitored:With the ignition on.Set Condition:The ECM detects a discrepancy between S/C Signal #1 and S/C Signal #2 for 5.0 seconds.Possible CausesINTERMITTENT CONDITION(V71) S/C SIGNAL #1 CIRCUIT OPEN(V72) S/C SIGNAL #2 CIRCUIT OPEN(V937) S/C SWITCH GROUND OPENSPEED CONTROL SWITCHENGINE CONTROL MODULEAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)1. CHECK FOR ACTIVE DTCKEYSIGNAL 1SIGNAL 2LO LIMITHI LIMITLO LIMITHI LIMITRELEASED4.494.564.494.56ON-OFF0.851.003.673.75SET3.293.391.301.45RESUME-ACCEL3.984.052.172.29CANCEL1.721.822.983.08If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.Turn the ignition on.With the scan tool, erase ECM DTCs.Test drive the vehicle and activate the Speed Control.At some point during the test drive, press each of the S/C Switch buttons.With the scan tool, read ECM DTCs.Did this DTC set again?YesGo To2NoRefer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)2. S/C SIGNALS OPEN

Turn the ignition off.Disconnect the S/C Switch harness connector.Disconnect the ECM harness connectors.Measure the resistance of the (V71) S/C Signal #1 circuit and the (V72) S/C Signal #2 circuit between the S/C Switch harness connector and the ECM harness connector.Is the resistance below 10.0 ohms for each measurement?YesGo To3NoRepair the S/C Signal circuit(s) for high resistance.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)3. (V937) S/C SWITCH GROUND OPEN

Measure the resistance of the (V937) S/C Switch Ground circuit between the S/C Switch harness connector and the ECM harness connector.Is the resistance below 10.0 ohms?YesGo To4NoRepair the S/C Switch Ground circuit for high resistance.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)4. SPEED CONTROL SWITCHReplace the S/C Switch.Turn the ignition on.With the scan tool, erase ECM DTCs.Test drive the vehicle and activate the Speed Control.At some point during the test drive, press each of the S/C Switch buttons.Monitor the scan tool for ECM DTCs.Did this DTC set again?YesReplace and program the Engine Control Module in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoThe repair is complete.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)