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DTC 4 Or DTC 1 & 4 - TCCM Ram/ROM Fault

  1. Turn ignition switch on and off 5 times, waiting 5 seconds between each cycle. Recheck DTCs. If DTC 4 is present, go to next step. If no DTC does not return, problem is intermittent.
  2. Replace TCCM. Restore all electrical connections. Repeat step 1). Ensure all DTCs are repaired.
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