Diagnostic Test

WARNING: This page is about a different car, the 2014 Fiat 500c and 2014 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.

POWERTRAIN CONTROL MODULE (PCM)
1. Turn the ignition on.
2. With the scan tool monitor the Ignition Off Time value.
3. While monitoring a stop watch, turn the Ignition off for 10 minutes, watch the stop watch for those 10 minutes and then turn the Ignition on.
4. With the scan tool check the Ignition Off Time value again.
  Does the Ignition Time Off value on the scan tool match the actual time you had the Ignition off on the stop watch?
  
  Yes
  - Go To 2
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
ENGINE COOLANT INSPECTION
NOTE:
This DTC will set if the engine cools quicker than it should compared to engine off times. If the customer washed a hot engine with the engine off, a One Trip Failure will set. If the vehicle is parked in a highly ventilated area or has a large fan blowing on it which might cause the engine to cool quicker than expected this DTC may set.
1. Turn the ignition off.
2. Allow the engine to cool enough to allow the pressure in the coolant system to drop enough to safely remove the radiator cap.
3. Inspect coolant for contamination, correct mixture, and incorrect coolant type.
4. Check the coolant level.
  Is the engine coolant level filled to the proper level?
  
  Yes
  - Go To 3
  No
  - Add the appropriate type and amount of engine coolant and perform a cooling system pressure test to check for leaks. Refer to DIAGNOSIS AND TESTING .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
ENGINE COOLANT TEMPERATURE SENSOR
1. Turn the ignition on.
2. Measure engine coolant temperature with an infrared thermometer upstream of the thermostat housing.
3. Using the scan tool, monitor the ECT Sensor temperature and compare it to the measured engine coolant temperature.
  Does the ECT Sensor temperature match the measured coolant temperature?
  
  Yes
  - Bleed air from cooling system, clear DTCs, and retest for faults. An intermittent fault may be present. If P1607 returns, monitor freeze frame data to determine ECT value when the fault occurred
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Inspect the ECT Sensor connector and PCM connector for corrosion and poor terminal fit. Check the 5-volt supply circuit at the ECT Sensor. Check the resistance of the sensor signal and return circuits for high resistance (above 5.0 Ohms). If the wiring checks ok replace the Thermostat.