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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L - DTCS P2237-00 To P2AE1-00 >> DTC Troubleshooting >> P2AB9-00-WASTEGATE Position Sensor "A" Circuit High >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read and record DTCs and Freeze Frame data on the repair order.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Disconnect the Wastegate Solenoid harness connector.
    2. Measure the voltage on the (F856) 5-Volt Supply circuit at the Wastegate Solenoid harness connector.

      Is the voltage above 5.2 volts?

      Yes 

      • Repair the (F856) 5-Volt Supply circuit a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE (K136) WASTEGATE POSITION SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Measure the voltage on the (K131) Wastegate Position Signal circuit at the Wastegate Solenoid harness connector.

      Is the voltage above 5.2 volts?

      Yes 

      • Repair the (K136) Wastegate Position Signal circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK FOR THE (K136) WASTEGATE POSITION SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Check for continuity between the (K136) Wastegate Position Signal circuit and the (F856) 5-Volt Supply circuit at the Wastegate Solenoid harness connector.

      Is there continuity between the (K136) Wastegate Position Signal circuit and the (F856) 5-Volt Supply circuit?

      Yes 

      • Repair the short between the (K136) Wastegate Position Signal circuit and the (F856) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE (K136) WASTEGATE POSITION SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K136) Wastegate Position Signal circuit between the Wastegate Solenoid harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (K136) Wastegate Position Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK THE (K900) SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K900) Sensor Ground circuit between the Wastegate Solenoid harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (K900) Sensor Ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. CHECK THE ABILITY OF THE PCM TO READ THE WASTEGATE POSITION SENSOR SIGNAL 
    1. Reconnect the PCM C2 harness connector.
    2. Connect a jumper between the (K136) Wastegate Position Signal circuit and the (K900) Sensor Ground circuit at the Wastegate Solenoid harness connector.
      NOTE:

      The scan tool should display the P2AB8-00-WASTEGATE POSITION SENSOR "A" CIRCUIT LOW DTC as active or pending with the jumper in place.

      Does the scan tool display as described above?

      Yes 

      No 

      • Go To  8
  8. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all PCM harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    5. Connect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Connect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    10. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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