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Home >> Jeep >> 2021 >> Cherokee High Altitude, Full Time T/Case Control >> Repair and Diagnosis >> Steering >> Steering Column >> (Electronic Steering Lock (ESL) Module - Electrical Diagnostics) >> DTC Troubleshooting >> U1412-62-Implausible Vehicle Speed Signal Received - Signal Compare Failure >> Diagnostic Test

Diagnostic Test

  1. CHECK IF DTC IS CURRENT 
    1. With the scan tool, read ESL DTCs.
    2. Record the Environmental Data and any DTCs.
    3. With the scan tool, erase DTCs.
    4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    5. With the scan tool, read ESL DTCs.

      Did the DTC reset?

      Yes 

      • Go to  2.

      No 

      • Go to  5.
  2. CHECK FOR ABS MODULE DTCS 
    1. With the scan tool, read ABS DTCs.

      Are ABS Vehicle Speed or Wheel Speed DTCs present?

      Yes 

      No 

      • Go to  3.
  3. CHECK (B22) CIRCUIT FOR AN OPEN 
    1. Turn the Ignition Switch OFF.
    2. Disconnect the ESL Module harness connector.
    3. Disconnect the ABS Module harness connector.
    4. Measure the resistance of the (B22) circuit between the ABS Module harness connector and the ESL Module harness connector.

      Is the resistance below 5.0 ohms?

      Yes 

      • Go to  4.

      No 

  4. CHECK (B22) CIRCUIT FOR A SHORT TO GROUND OR SHORT TO ANOTHER CIRCUIT 
    1. Measure the resistance between ground and the (B22) circuit at the ABS Module harness connector.
    2. Measure the resistance between the (B22) circuit and all other circuits in the ABS Module harness connector.

      Is there continuity between the (B22) circuit and ground or another circuit?

      Yes 

      No 

      • Using the schematics as a guide, check the Electronic Steering Lock (ESL) terminals and connectors for corrosion, damage or pushed out terminals. Pay particular attention to the power and ground circuits. If no problems are found, replace the ESL Module in accordance with the Service Information.
      • Perform the Electronic Steering Lock (ESL) Verification Test. Refer to ELECTRONIC STEERING LOCK (ESL) VERIFICATION TEST  .
  5. CHECK 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 circuit.
    3. Wiggle the wires while checking for shorted and open circuits.
    4. Check for any Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      No 

      • Test complete.