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Home › Chrysler › 2009 › Sebring Base, 2D Convertible, ED3 › Repair and Diagnosis › Engine Performance › System › DTCS P2308 To U110F - GPEC › P2431-Secondary Air Injection System Air Flow Sensor Circuit Performance › Diagnostic Test

Diagnostic Test

  1. DTC IS ACTIVE 
    WARNING: The normal operating temperature of the exhaust system is very high. Never work around or attempt to service any part of the exhaust system until it has cooled. Special care should be taken when working near any part of the exhaust system. The temperature rises to a high level after a short period of engine operating time.
    NOTE: Diagnose and repair any system voltage or Main Relay circuit DTCs before continuing with this test.
    1. Turn the ignition on.
    2. With the scan tool, select View DTCs and review the DTC environmental data for this DTC.

      Is the good trip counter greater than 0?

      Yes 

      No 

      • Go to step  2
  2. (F343) FUSED MAIN RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 1: Checking Fused Main Relay Output Circuit
    GC0123844Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Airflow Sensor connector.
    3. Turn the ignition on.
    4. Using a 12-volt test light connected to ground, check the (F343) Fused Main Relay Output circuit in the Airflow Sensor harness connector.
      NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

      Is the test light illuminated and bright?

      Yes 

      • Go to step  3

      No 

  3. (K157) SAF SIGNAL CIRCUIT VOLTAGE 
    Fig 2: Checking SAF Signal Circuit
    GC0123845Courtesy of CHRYSLER LLC
    1. Turn the ignition on.
    2. Measure the voltage of the (K157) SAF Signal circuit in the Airflow Sensor harness connector.

      Is the voltage between 4.8 and 50.1 of a volt?

      Yes 

      • Go to step  4

      No 

      • Go to step  6
  4. (K957) SENSOR GROUND CIRCUIT TEST 
    Fig 3: Checking SAF Ground Circuit
    GC0123846Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Using a 12-volt test light connected to 12 volts, check the (K957) Sensor Ground circuit in the Airflow Sensor harness connector.
      NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

      Is the test light illuminated and bright?

      Yes 

      • Go to step  5

      No 

      • Go to step  9
  5. AIRFLOW SENSOR 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Airflow Sensor and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched, or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related connectors.
    4. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
    5. Look for the data to change or for the DTC to reset during the wiggle test.
    6. Perform any Technical Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

  6. (K157) SAF SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 4: Checking SAF Signal Circuit
    GC0123845Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Powertrain Control Module (PCM) connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (K157) SAF Signal circuit in the Airflow Sensor harness connector.

      Is there any voltage present?

      Yes 

      No 

      • Go to step  7
  7. (K157) SAF SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 5: Checking SAF Signal Circuit
    GC0123847Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Measure the resistance between ground and the (K157) SAF Signal circuit in the Airflow Sensor harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go to step  8

      No 

  8. (K157) SAF SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 6: Checking SAF Signal Circuit
    GC0123848Courtesy of CHRYSLER LLC
    NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
    1. Measure the resistance of the (K157) SAF Signal circuit between the Airflow Sensor harness connector and the PCM.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go to step  10

      No 

  9. (K957) SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 7: Checking SAF Ground Circuit
    GC0123849Courtesy of CHRYSLER LLC
    NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
    1. Measure the resistance of the (K957) Sensor Ground circuit between the Airflow Sensor harness connector and the PCM.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go to step  10

      No 

  10. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Secondary Air Pump Assembly and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched, or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related connectors.
    4. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
    5. Look for the data to change or for the DTC to reset during the wiggle test.
    6. Perform any Technical Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

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