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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 2.4L Engine - DTCS PO509 To P0850 >> Diagnosis And Testing >> P0509-Idle Air Control Valve Sense Circuit High >> Diagnostic Test

Diagnostic Test

  1. 1)  IAC MOTOR OPERATION 
    NOTE: If the engine will not idle, maintain an engine speed between 800 and 1500 RPM.

    Start the engine.

    Allow the engine to idle.

    With a scan tool, read the IAC Current.

    Is the IAC Current above 999 mA? 

    Yes 

    1. Go To  2).

    No 

    1. Refer to the INTERMITTENT CONDITION diagnostic procedure.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  2. 2)  IAC MOTOR 

    Turn the ignition off.

    Disconnect the IAC Motor harness connector.

    With the scan tool, monitor the IAC Current.

    Ignition on, engine not running.

    Does the scan tool display IAC Current at 0 mA? 

    Yes 

    1. Replace the IAC Motor.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  3).
  3. 3)  (K961) IAC SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 1: MEASURING FOR VOLTAGE ON THE IAC SIGNAL CIRCUIT
    GC0041698Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the C2 PCM harness connector.

    Ignition on, engine not running.

    Measure the voltage on the (K961) IAC Signal circuit in the IAC Motor harness connector.

    Is the voltage above 0.5 of a volt? 

    Yes 

    1. Repair the short to battery voltage in the (K961) IAC Signal circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  4).
  4. 4)  (K61) IAC MOTOR CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 2: MEASURING FOR VOLTAGE ON THE IAC MOTOR CONTROL CIRCUIT
    GC0041699Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Measure the voltage on the (K61) IAC MOTOR CONTROL circuit in the IAC Motor harness connector.

    Is the voltage above 0.5 of a volt? 

    Yes 

    1. Repair the short to battery voltage in the (K61) IAC MOTOR CONTROL circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  5).
  5. 5)  (K61) IAC MOTOR CONTROL CIRCUIT SHORTED TO THE (K961) IAC RETURN CIRCUIT 
    Fig 3: MEASURING RESISTANCE ACROSS THE IAC SIGNAL CIRCUIT AND IAC MOTOR CONTROL CIRCUIT
    GC0041700Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance across the (K961) IAC Signal circuit and the (K61) IAC MOTOR CONTROL circuit in the IAC Motor harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the short between the (K961) IAC Signal circuit and the (K61) IAC MOTOR CONTROL circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  6).
  6. 6)  PCM 
    NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

    Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

    Were there any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Replace and program the Powertrain Control Module per Service Information. Refer to MODULE-POWERTRAIN CONTROL and STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING .
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
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