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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (2.9L Pcm 2 - DTCS C1260-00 To P0276-00) >> DTC Troubleshooting >> P0228-00-Throttle Position Sensor 3 Circuit High >> 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. With the scan tool read DTCs.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

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

      Are there any Throttle Body circuit, system voltage or 5-Volt Reference DTCs active or pending?

      Yes 

      • Perform the applicable diagnostic procedure(s). Refer to DTC INDEX .

      No 

      • Go To  3
  3. CHECK THE (F857) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Throttle Body 2 harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (F857) 5-Volt Supply circuit at the Throttle Body 2 harness connector.

      Is the voltage above 5.2 volts?

      Yes 

      • Repair the (F857) 5-Volt Supply circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (K928) TPS 3 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Measure the voltage on the (K928) TPS 3 Signal circuit at the Throttle Body 2 harness connector.

      Is the voltage above 5.2 volts?

      Yes 

      • Repair the (K928) TPS 3 Signal circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK FOR THE (K928) TPS 3 SIGNAL CIRCUIT SHORTED TO THE (F857) 5-VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the PCM-2 C1 harness connector.
    3. Check for continuity between the (K928) TPS 3 Signal circuit and the (F857) 5-Volt Supply circuit at the Throttle Body 2 harness connector.

      Is there continuity between the (K928) TPS 3 Signal circuit and the (F857) 5-Volt Supply circuit?

      Yes 

      • Repair the short between the (K928) TPS 3 Signal circuit and the (F857) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK FOR THE (K928) TPS 3 SIGNAL CIRCUIT SHORTED TO THE (K920) ETC MOTOR (+) CIRCUIT 
    1. Check for continuity between the (K928) TPS Signal 2 circuit and the (K920) ETC Motor (+) circuit at the Throttle Body 2 harness connector.

      Is there continuity between the (K928) TPS Signal 2 circuit and the (K920) ETC Motor (+) circuit?

      Yes 

      • Repair the short between the (K928) TPS Signal 2 circuit and the (K920) ETC Motor (+) circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. CHECK FOR THE (K928) TPS 3 SIGNAL CIRCUIT SHORTED TO THE (K927) ETC MOTOR (-) CIRCUIT 
    1. Check for continuity between the (K928) TPS Signal 2 circuit and the (K927) ETC Motor (-) circuit at the Throttle Body 2 harness connector.

      Is there continuity between the (K928) TPS Signal 2 circuit and the (K927) ETC Motor (-) circuit?

      Yes 

      • Repair the short between the (K928) TPS Signal 2 circuit and the (K927) ETC Motor (-) circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  8
  8. CHECK THE (K928) TPS SIGNAL 2 CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K928) TPS Signal 2 circuit between the Throttle Body 2 harness connector and the PCM-2 C1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  9

      No 

      • Repair the (K928) TPS Signal 2 for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  9. CHECK THE (K922) TPS RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K922) TPS Return Circuit between the Throttle Body 2 harness connector and the PCM-2 C1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  10

      No 

      • Repair the (K922) TPS Return Circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  10. CHECK THE ABILITY OF THE PCM TO READ THE THROTTLE POSITION SENSOR SIGNAL 
    1. Turn the ignition off.
    2. Reconnect the PCM-2 C1 harness connector.
    3. Connect a jumper between the (K928) TPS Signal 2 circuit and the (F857) 5-Volt Supply circuit at the Throttle Body 2 harness connector.
    4. Turn the ignition on.
    5. With a scan tool, read the Throttle Body 2 voltage.
      NOTE:

      The sensor voltage should be 5.0 volts (plus or minus.1 volts) with the jumper in place.

      Does the scan tool display the voltage as described above?

      Yes 

      • Verify that there is good pin to terminal contact in the Throttle Body 2 and Powertrain Control Module connectors. If no problems are found, replace the Throttle Body 2 Assembly. Refer to THROTTLE BODY, REMOVAL AND INSTALLATION . After installation is complete, with a scan tool select the ETC RELEARN function.

      No 

      • Go To  11
  11. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all PCM-2 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-2 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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