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Home >> Jeep >> 2017 >> Wrangler Sahara, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 76 ((Active Cruise Control (Acc) Module - Electrical Diagnostics)) >> DTC Troubleshooting >> P1593-2A-Speed Control Switch 1/2 Stuck >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read Adaptive Cruise Control (ACC) Module DTCs and record on the repair order.
    3. With the scan tool, erase ACC Module DTCs.
    4. Turn the ignition off
    5. Start the engine.
    6. Activate the ACC.
    7. With the scan tool, read ACC Module DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

      • Go To  3
  2. CHECK SPEED CONTROL SWITCH OPERATION 
    1. With the scan tool, read the Speed Control Switch status under the Steering Column Control Module (SCCM) while pressing multiple switch positions.

      Does the switch positions change correctly in the scan tool?

      Yes 

      • If any Body Control Module (BCM) Bus related DTCs are present, perform those respective diagnostic procedures first and recheck. Inspect the wiring and connectors between the SCCM and the Speed Control Switch and the output to the BCM for any possible problems. If no problems are found, replace and program the SCCM in accordance with the Service Information.

      No 

      • Inspect the wiring and connectors between the SCCM and the Speed Control Switch. If no problems are found, replace the Speed Control Switch in accordance with the Service Information. Refer to SWITCH, SPEED CONTROL, REMOVAL .
  3. CHECK THE WIRING AND CONNECTORS 
    1. The conditions necessary to set the DTC are not present at this time.
    2. Using the schematics as a guide, inspect the wiring and connectors specific to this Module, Speed Control Switch and the Steering Column Control Module (SCCM). Wiggle the wiring and connectors while checking for shorted and open circuits.
    3. Check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
    4. Check Service Bulletins for any possible causes that may apply.

      Were there any problems found?

      Yes 

      • Repair as necessary.
      • Perform the ADAPTIVE CRUISE CONTROL VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Test complete.
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