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Home >> Chrysler >> 2004 >> Crossfire Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Electrical Diagnostics >> Diagnosis And Testing >> DTC P0128: Thermostat Rationality >> Diagnostic Test >> 1. Check For Current DTC

1. Check For Current DTC

NOTE: If any ECT, CMP, IAT or CKP sensor DTCs have set along with P0128, diagnose them first before continuing.
NOTE: If the PCM detects and stores a DTC, the PCM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the DRB III(R) 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 III(R), erase PCM DTCs.

NOTE: It maybe necessary to road test the vehicle for this DTC to set.

With the DRB III(R), read the PCM DTCs.

Did this DTC set again? 

  1. Yes  >> Go To 2
  2. No  >> Go To 14 
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