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Home >> Jeep >> 2022 >> Compass Sport, 4WD >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Antilock Brake System (Abs) (ZF TRW) - DTCS C1304-86 To C1438-86 >> DTC Troubleshooting >> C1421-67-DASM Request During Fail - Signal Incorrect After Event >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    This DTC must be active for the results of this test to be valid.

    1. Turn the ignition on.
    2. With the scan tool, read ABS DTCs and record on the repair order.
    3. With the scan tool, erase DTCs.
    4. Start the engine.
    5. Turn the steering wheel from stop to stop several times.
    6. With the scan tool, read ABS DTCs.

      Did the DTC return?

      Yes 

      • Go To 2

      No 

      • The conditions that caused this code to set are not present at this time. Using the appropriate SYSTEM WIRING DIAGRAM/schematic as a guide, inspect the wiring harness and electrical connectors.
      • Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  2. CHECK FOR DTCS IN THE ADAPTIVE CRUISE CONTROL (ACC) MODULE 
    1. With the scan tool, read DTCs ACC Module.

      Is the ACC Module reporting any DTCs?

      Yes 

      No 

      • Go To  3
  3. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect the ABS Module harness connector.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Perform a terminal drag test on each connector terminal to verify proper terminal tension.

      Repair any conditions that are found.

    5. Connect the ABS Module harness connector. Be certain that the harness connector is fully seated and the connector lock is fully engaged.
    6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Connect the related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Using the recorded Event and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    10. With the scan tool, read ABS Module DTCs.

      Did the DTC return?

      Yes 

      No