Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURES - P0585-S/C SWITCH PLAUSIBILITY BETWEEN SWITCH #1 AND #2
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 |
NOTE:
If 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 DRB at the same time the DTC is displayed.
NOTE:
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 DRB, 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 DRB, read ECM DTCs.Did this DTC set again?Yes --> Go To 2No --> Go To 5 |
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| 2 | Turn the ignition off. Disconnect the S/C Switch harness connectors. Disconnect the ECM harness connectors. Measure the resistance of the S/C Switch #1 Signal circuit and the S/C Switch #2 Signal circuit between each S/C Switch harness connector and the ECM harness connector. Is the resistance below 10.0 ohms for each measurement? Yes --> Go To 3 No --> Repair the S/C Switch Signal circuit(s) for high resistance. Perform SPEED CONTROL VERIFICATION - VER-4 . |
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| 3 | Turn the ignition off. Disconnect the S/C Switch harness connectors. Disconnect the ECM harness connectors. Measure the resistance of the Sensor Ground circuit between each S/C Switch harness connector and the ECM harness connector. Is the resistance below 10.0 ohms for both measurements? Yes --> Go To 4 No --> Repair the S/C Switch Ground circuit for high resistance. Perform SPEED CONTROL VERIFICATION - VER-4 . |
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| 4 | Turn the ignition off. Replace the S/C Switches. Turn the ignition on. With the DRB, 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 DRB for ECM DTCs. Did this DTC set again? Yes --> Replace and program the Engine Control Module in accordance with the Service Information. Perform SPEED CONTROL VERIFICATION - VER-4 . No --> The repair is complete. Perform SPEED CONTROL VERIFICATION - VER-4 . |
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| 5- |
WARNING:
WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE:
The conditions that set the DTC are not present at this time. The following list may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRB parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the conditions under which the DTC was set.Refer to any Technical Service Bulletins (TSB) that may apply.Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.Were any of the above conditions present?Yes --> Repair as necessary.Perform SPEED CONTROL VERIFICATION - VER-4 .No --> Test Complete. |
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