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Home >> Fiat >> 2016 >> 500 Turbo, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (1.4L 16-Valve - DTCS P16AB-00 To U1463 - 500) >> DTC Troubleshooting >> P2123-00-Accelerator Pedal Position Sensor 1 Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    When this DTC is Active the engine speed, torque and vehicle speed are limited to a Limp in mode.

    1. Turn the ignition on.
      WARNING:

      When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in possible serious or fatal injury.

      NOTE:

      If there are any 5-Volt Reference DTCs present, diagnose and repair those DTCs before continuing with this test procedure.

      NOTE:

      If you are viewing data recorder information or Freeze Frame data the APP Sensor No. 2 is pulled low by the PCM as part of its system testing. This test happens every 320 milliseconds and may not show up on the scan tool but may show up on a data recorder or lab scope. It is acceptable to see the voltage close to zero with a normal sensor when using a data recorder/lab scope.

    2. With the scan tool, read DTCs and record on the repair order.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

      • Go To  8
  2. CHECK THE (K23) APP SENSOR 1 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the APP Sensor harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (K23) APP Sensor 1 Signal circuit at the APP Sensor harness connector.

      Is the voltage above 5.2 volts?

      Yes 

      • Repair the APP Sensor 1 Signal circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK FOR THE (K23) APP Sensor 1 SIGNAL CIRCUIT SHORTED TO THE (K852) 5-VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the PCM C1 harness connector.
    3. Measure the resistance between the (K23) APP Sensor 1 Signal circuit and the (K852) 5-Volt Supply circuit at the APP Sensor harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the short between the (K23) APP Sensor 1 Signal circuit and the (K852) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  4. CHECK FOR THE (K23) APP Sensor 1 SIGNAL CIRCUIT SHORTED TO THE (K854) 5-VOLT SUPPLY CIRCUIT 
    1. Measure the resistance between the (K23) APP Sensor 1 Signal circuit and the (K854) 5-Volt Supply circuit at the APP Sensor harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the short between the (K23) APP Sensor 1 Signal circuit and the (K854) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK THE (K167) APP SENSOR 1 RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K23) APP Sensor 1 Signal circuit and the between the APP Sensor harness connector and the PCM C1 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (K167) APP Sensor 1 Return circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. ACCELERATOR PEDAL POSITION SENSOR 
    1. Reconnect the PCM C1 harness connector.
    2. Connect a jumper between the (K23) APP Sensor 1 Signal circuit and the (K167) APP Sensor 1 Return circuit and the.
    3. Turn the ignition on.
    4. With the scan tool, monitor the APP Sensor No. 1 voltage.

      Does the voltage read 0 volts?

      Yes 

      • Verify that there is good pin to terminal contact in the APP Sensor and Powertrain Control Module connectors. If OK, replace the Accelerator Pedal Position Sensor Assembly in accordance with the Service Information. Refer to PEDAL, ACCELERATOR . After installation is complete, use a scan tool and perform the Reset Accelerator Pedal Adaptives to relearn the APP Sensor values.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. 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 

  8. APP SENSOR 1 SWEEP 
    1. Turn the ignition on, engine not running.
    2. With the scan tool, monitor the Accelerator Pedal Position Sensor voltage.
    3. Slowly press the Accelerator Pedal down.

      Does voltage start at approximately 0.45 volts and go to approximately 4.6 volts with a smooth transition?

      Yes 

      No 

      • Verify that there is good pin to terminal contact in the APP Sensor and Powertrain Control Module connectors. If OK, replace the Accelerator Pedal Position Sensor Assembly in accordance with the Service Information. Refer to PEDAL, ACCELERATOR . After installation is complete, use a scan tool and perform the Reset Accelerator Pedal Adaptives to relearn the APP Sensor values.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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