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Home >> Jeep >> 2016 >> Compass Sport SE, 2.0L Eng VIN A >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L & 2.4L - DTCS P000A To P0302 >> DTC Troubleshooting >> DTC P0128: -Thermostat Rationality >> Diagnostic Test

Diagnostic Test

  1. CHECKING THE TEMPERATURE SENSORS. 
    NOTE:

    Diagnose and repair any ambient air temperature (AAT), intake air temperature (IAT), or engine coolant temperature (ECT) sensor circuit or rationality DTCs before continuing with this test.

    NOTE:

    Diagnose and repair any crankshaft (CKP) or camshaft (CMP) sensor circuit or rationality DTCs before continuing with this test.

    NOTE:

    Diagnose and repair any communication DTCs before continuing with this test.

    NOTE:

    Verify that the Pinion Factor has been programmed correctly into the PCM.

    1. Perform the diagnostic procedure for CHECKING THE TEMPERATURE SENSORS. Refer to CHECKING THE TEMPERATURE SENSORS .

      Were any problems found?

      Yes 

      No 

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  2. CHECKING THE ENGINE COOLANT TEMPERATURE SENSOR OPERATION. 
    1. Perform the diagnostic procedure for CHECKING THE ENGINE COOLANT TEMPERATURE SENSOR OPERATION. Refer to CHECKING THE ENGINE COOLANT TEMPERATURE SENSOR PERFORMANCE .

      Were any problems found?

      Yes 

      No