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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (2.9L Pcm 1 - DTCS P2100-00 To P3405-00) >> DTC Troubleshooting >> P2140-00-Accelerator Pedal Position Sensor 2/Throttle Position Sensor 2 Correlation >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. Slowly press and release the Accelerator pedal several times.
    3. With the scan tool, read DTCs and record on the repair order.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK FOR HIGH RESISTANCE IN THE (K852) 5-VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the APP Sensor harness connector.
      NOTE:

      Check the connector for proper connection to the sensor and carefully inspect for pushed out, corroded or damaged terminals in the connector before performing any electrical checks or replacing any components.

    3. Disconnect the PCM-1 C1 harness connector.
    4. Measure the resistance of the (K852) 5-Volt Supply circuit between the APP Sensor harness connector and the PCM-1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  3

      No 

      • Repair the (K852) 5-Volt Supply circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  3. CHECK FOR HIGH RESISTANCE IN THE (K23) APP SENSOR SIGNAL 1 CIRCUIT 
    1. Measure the resistance of the (K23) APP Sensor Signal 1 circuit between the APP Sensor harness connector and the PCM-1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the (K23) APP Sensor Signal 1 circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  4. CHECK FOR HIGH RESISTANCE IN THE (K167) APP SENSOR GROUND 1 CIRCUIT 
    1. Measure the resistance of the (K167) APP Sensor 1 Ground circuit between the APP Sensor harness connector and the PCM-1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (K167) APP Sensor 1 Ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK FOR HIGH RESISTANCE IN THE (K852) 5-VOLT SUPPLY CIRCUIT 
    1. Measure the resistance of the (K852) 5-Volt Supply circuit between the APP Sensor harness connector and the PCM-1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (K852) 5-Volt Supply circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK FOR HIGH RESISTANCE IN THE (K29) APP SENSOR SIGNAL 2 CIRCUIT 
    1. Measure the resistance of the (K29) APP Sensor Signal 2 circuit between the APP Sensor harness connector and the PCM-1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (K29) APP Sensor Signal 2 circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. CHECK FOR HIGH RESISTANCE IN THE (K400) APP SENSOR 2 GROUND CIRCUIT 
    1. Measure the resistance of the (K400) APP Sensor 2 Ground circuit between the APP Sensor harness connector and the PCM-1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  8

      No 

      • Repair the (K400) APP Sensor 2 Ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. ACCELERATOR PEDAL POSITION SENSOR 
    1. Turn the ignition off.
    2. Reconnect the APP Sensor harness connector.
    3. Reconnect the PCM-1 C1 harness connector.
    4. Turn the ignition on, engine not running.
    5. With the scan tool, set both APP Sensors to a graph.
    6. Slowly press and release the Accelerator Pedal while monitoring the graph of the sensors on the scan tool.

      Does the scope pattern show any missing or erratic signals for either APP Sensor?

      Yes 

      • Replace the Accelerator Pedal Position Sensor in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  9
  9. CHECK RELATED PCM AND COMPONENT CONNECTIONS 
    1. Perform any Service Bulletins that apply.
    2. Disconnect all PCM-1 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-1 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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