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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L - DTCS P1E3A-00 To P2227-00 >> Diagnosis And Testing >> P2173-00-Throttle Actuator Control System - High Air Flow Detected >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    1. Start the engine and allow it to idle until closed loop fueling is achieved.
    2. 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 OTHER DTCS 
    1. Refer to the recorded DTCs.

      Are there any 5-Volt Reference, TPS, VVA Solenoid, Inlet Air Pressure Sensor, Throttle Body or MAP Sensor DTCs active or pending?

      Yes 

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

      No 

      • Go To  3
  3. CHECK THE ENGINE OIL AND OILING SYSTEM 
    1. The following conditions must be checked:
      • LOW ENGINE OIL
      • ENGINE OIL MEETS OEM SPECIFICATION
      • ENGINE MECHANICAL TOLERANCES OUT OF SPECIFICATION
      • ENGINE OIL PRESSURE OUT OF SPECIFICATION
      • DETERIORATED OR DIRTY OIL
      • ENGINE OIL CONTAMINATED (i.e., coolant and/or fuel)
      • COOLING SYSTEM NOT OPERATING TO SPECIFICATION

      Were any of the above conditions found?

      Yes 

      No 

      • Go To  4
  4. COMPARE THE ENGINE VACUUM AND MAP SENSOR READING 
    1. Turn the engine off.
    2. Connect a vacuum gauge to the Intake Manifold.
    3. Start the engine and allow it to idle.
    4. Monitor the reading on the vacuum gauge.
    5. Monitor the MAP Sensor reading on the scan tool.

      Compare the scan tool reading to the vacuum gauge reading?

      Both of the readings match. 

      • Check and repair any engine vacuum leaks, exhaust restrictions, or engine mechanical conditions that can cause low engine compression.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      MAP reading on scan tool does not match the measured vacuum. 

      • Go To  5
  5. CHECK FOR HIGH RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the MAP Sensor harness connector.
    3. Disconnect the PCM C2 harness connector.
    4. Measure the resistance of the (F855) 5-Volt Supply circuit between the MAP Sensor harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (F855) 5-Volt Supply circuit for high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK FOR HIGH RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT 
    1. Measure the resistance of the (K1) MAP Signal circuit between the MAP Sensor harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

  7. CHECK FOR HIGH RESISTANCE IN THE (K914) SENSOR GROUND CIRCUIT 
    1. Measure the resistance of the (K914) Sensor Ground circuit between the MAP Sensor harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  8

      No 

      • Repair the excessive (K914) Sensor ground circuit for high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. CHECK THE MAP SENSOR AND PORT FOR OBSTRUCTIONS 
    1. Remove the MAP Sensor.
    2. Inspect the MAP Sensor and port for any obstructions.

      Were any obstructions found?

      Yes 

      No 

      • Go To  9
  9. REPLACE THE MAP SENSOR AND RETEST FOR DTC 
    1. Replace the MAP Sensor in accordance with the Service Information. Refer to SENSOR, TMAP-INTAKE MANIFOLD, REMOVAL AND INSTALLATION .
    2. Turn the ignition on.
    3. With the scan tool, erase DTCs.
    4. Start the engine and allow it to idle until closed loop fueling is achieved.
    5. With the scan tool, read DTCs and record on the repair order.

      Did the DTC return?

      Yes 

      • Go To  10

      No 

  10. 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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