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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 2.0L - DTCS P1E3A-00 To P2227-00 >> Diagnosis And Testing >> P2135-00-Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation >> Diagnostic Test

Diagnostic Test

  1. 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 

      • Go To  2

      No 

  2. CHECK FOR AN INTERMITTENT WIRING/CONNECTOR ISSUE 
    1. With the scan tool, perform the ETC Throttle Follower Test again and wiggle test the wiring harness connector while slowly operating the throttle pedal to wide open throttle and back to closed throttle. Again, attempt to duplicate the position recorded in the Freeze Frame Data. Monitor the TPS 1 and TPS 2 voltages while wiggle testing the connector.
    2. If the absolute difference is still more than 0.25 volts, turn the ignition off, disconnect and reconnect the Throttle Body harness connector and repeat the step above.

      Did the absolute difference of the two sensors become less than 0.25 volts while wiggle testing the connector or after the connector was unplugged and reconnected?

      Yes 

      • Replace the Throttle Body connector if available or perform appropriate repair to the connector for an intermittent connection.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK FOR AN ACTIVE TPS SENSOR PERFORMANCE DTC 

    Are the P0121 or P0221 DTC also active?

    Yes 

    • Perform the TPS Sensor Performance DTC that is active before continuing with this test procedure.

    No 

    • Go To  4
  4. CHECK FOR A SHORT BETWEEN THE (K22) TPS 1 SIGNAL CIRCUIT AND THE (K122) TPS 2 SIGNAL CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the Throttle Body harness connector.
    3. Disconnect the PCM C2 harness connector.
    4. Check for continuity between the (K22) TPS 1 Signal circuit and the (K122) TPS 2 Signal circuit at the Throttle Body harness connector.

      Is there continuity between the (K22) TPS 1 Signal circuit and the (K122) TPS 2 Signal circuit?

      Yes 

      • Repair the short between the (K22) TPS 1 Signal circuit and the (K122) TPS 2 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK FOR HIGH RESISTANCE IN THE (K22) TPS 1 SIGNAL CIRCUIT 
    1. Measure the resistance of the (K22) TPS 1 Signal circuit between the Throttle Body harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (K22) TPS 1 Signal circuit for high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK FOR HIGH RESISTANCE IN THE (K122) TPS 2 SIGNAL CIRCUIT 
    1. Measure the resistance of the (K122) TPS 2 Signal circuit between the Throttle Body harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (K122) TPS 2 Signal circuit for high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. CHECK FOR HIGH RESISTANCE IN THE (K922) TPS RETURN CIRCUIT 
    1. Measure the resistance of the (K922) TPS Return circuit between the Throttle Body harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  8

      No 

      • Repair the (K922) TPS Return circuit for high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. CHECK FOR HIGH RESISTANCE IN THE (F851) 5-VOLT SUPPLY CIRCUIT 
    1. Measure the resistance of the (F851) 5-Volt Supply circuit between the Throttle Body harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To

      No 

      • Repair the (F851) 5-Volt Supply circuit for high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  9. REPLACE THE THROTTLE BODY ASSEMBLY AND RETEST FOR DTCS 
    1. Turn the ignition off.
    2. Replace the Throttle Body Assembly in accordance with the Service Information. 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 select the ETC RELEARN function.
    3. Connect the Throttle Body harness and PCM C2 harness connectors.
    4. Turn the ignition on.
    5. With the scan tool, erase all DTCs.
    6. Turn the ignition off for a minimum of 10.0 seconds.
    7. Turn the ignition on.
    8. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
    9. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  10

      No 

  10. CHECK RELATED PCM AND COMPONENT CONNECTIONS 
    1. Perform any Service Bulletins that apply.
    2. Disconnect all PCM harness connectors.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. 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.

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

      Did the DTC return?

      Yes 

      No 

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