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Home >> Chrysler >> 2004 >> Sebring LXi, 2D Convertible >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Powertrain Diagnostic Procedures - NGC DRIVEABILITY Diagnostic Tests DTCS P0462 To P2503, DTCS U0101 To U110C - Except Coupe >> DTC P0509: IAC Valve Sense Circuit High >> Possible Causes

Possible Causes

IAC MOTOR OPERATION

IAC MOTOR

(K60) IAC SIGNAL CIRCUIT SHORTED TO VOLTAGE

(K39) IAC MOTOR CONTROL CIRCUIT SHORTED TO VOLTAGE

(K60) IAC SIGNAL CIRCUIT SHORTED TO (K39) IAC MOTOR CONTROL CIRCUIT

PCM

DIAGNOSTIC PROCEDURE - P0509-IAC VALVE SENSE CIRCUIT HIGH

TEST ACTION
1
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 the DRBIII®, read the IAC Current.Is the IAC Current above 999 mA?
  1. Yes --> Go To 2
  2. No --> Refer to the INTERMITTENT CONDITION symptom in the Driveability category.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
2 Turn the ignition off.
Disconnect the IAC Motor harness connector.
With the DRBIII®, monitor the IAC Current.
Turn the ignition on.
Does the DRBIII® display IAC Current at 0 mA?
  1. Yes --> Replace the IAC Motor.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Go To 3
3 Turn the ignition off.
Disconnect the IAC Motor harness connector.
Turn the ignition on.
With the DRBIII®, actuate the ASD Relay.
Measure the voltage of the (K60) IAC Signal circuit in the IAC Motor harness connector.
Is the voltage above 0.5 of a volt?
  1. Yes --> Repair the short to voltage in the (K60) IAC Signal circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Go To 4
4 Turn the ignition off.
Disconnect the IAC Motor harness connector.
Turn the ignition on.
With the DRBIII®, actuate the ASD Relay.
Measure the voltage of the (K39) IAC Motor Driver circuit in the IAC Motor harness connector.
Is the voltage above 0.5 of a volt?
  1. Yes --> Repair the short to voltage in the (K39) IAC Motor Control circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Go To 5
5 Turn the ignition off.
Disconnect the IAC Motor harness connector.
Measure the resistance across the IAC Motor harness connector.
Is the resistance below 5.0 ohms?
  1. Yes --> Repair the (K60) IAC Motor Signal circuit short to the (K39) IAC Motor Control circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Go To 6
6
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
If there are no possible causes remaining, view repair.Repair:Replace and program the Powertrain Control Module in accordance with the Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
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