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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L - DTCS P1128-00 To P1E39-00 >> DTC Troubleshooting >> P16A2-00-Motorized Throttle Self Learning (LIMPHOME Position Test) - Commanded Position Not Reachable >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR ANY SERVICE BULLETINS OR PCM SOFTWARE UPDATES 
    1. Check for any applicable Service Bulletins or Flash updates related to the DTC.

      Are there any applicable Service Bulletins or Flash updates?

      Yes 

      No 

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  2. READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN 
    1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
    2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
    3. With the scan tool, erase all DTCs.
    4. Turn the ignition off for a minimum of 10.0 seconds.
    5. Turn the ignition on.
    6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
    7. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

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      No 

  3. CHECK FOR OTHER DTCS 
    1. Refer to the recorded DTCs.

      Are there any Throttle Position Sensor DTCs active or pending?

      Yes 

      No 

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  4. THROTTLE PLATE INSPECTION 
    1. Turn the ignition off.
    2. Remove the Air Cleaner Assembly from the Throttle Body.
    3. Inspect for any signs of coking or a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick. Manually move the throttle plate and check for any sticking.

      Were any signs of foreign material or scoring of the throttle plate or bore found?

      Yes 

      • Clean the throttle blade and bore if possible or replace the Throttle Body Assembly if necessary. Refer to THROTTLE BODY, REMOVAL AND INSTALLATION . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and perform the THROTTLE BODY SELF LEARN.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

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  5. CHECK THE ETC MOTOR AND HARNESS CONNECTIONS 
    1. Disconnect the Throttle Body harness connector.
    2. Check the connectors and terminals for any corroded, pushed out or damaged pins.
    3. Measure the resistance of the ETC Motor between the ETC Positive circuit and the ETC Negative circuit at the appropriate terminals of the PCM harness connector.

      Were any problems found?

      Yes 

      No