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Home >> Chrysler >> 2004 >> Sebring Limited, 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 P0508: IAC Valve Sense Circuit Low >> Possible Causes

Possible Causes

IAC MOTOR OPERATION

IAC MOTOR

(K39) IAC MOTOR CONTROL CIRCUIT SHORTED TO GROUND

(K60) IAC SIGNAL CIRCUIT OPEN

(K60) IAC SIGNAL CIRCUIT SHORTED TO GROUND

(K39) IAC MOTOR CONTROL CIRCUIT OPEN

PCM

DIAGNOSTIC PROCEDURE - P0508-IAC VALVE SENSE CIRCUIT LOW

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 below 146 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.
Remove the IAC Motor.
NOTE: Inspect the IAC air passages for restriction and damage to the IAC valve.

Measure the resistance across the IAC Motor pin terminals (component).
Is the resistance 9.7 +/- 1.0 ohms?
  1. Yes --> Go To 3
  2. No --> Replace the IAC Motor.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
3 Turn the ignition off.
Disconnect the IAC Motor harness connector.
Disconnect the PCM harness connectors.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (K60) IAC Signal circuit from the IAC Motor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
  1. Yes --> Go To 4
  2. No --> Repair the open in the (K60) IAC Signal circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
4 Turn the ignition off.
Disconnect the IAC Motor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the (K60) IAC Signal in the IAC Motor harness connector.
Is the resistance below 100 ohms?
  1. Yes --> Repair the short to ground in the (K60) IAC Signal circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Go To 5
5 Turn the ignition off.
Disconnect the IAC Motor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the (K39) IAC Motor Control circuit in the IAC Motor harness connector.
Is the resistance below 100 ohms?
  1. Yes --> Repair the short to ground in the (K39) IAC Motor Control circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Go To 6
6 Turn the ignition off.
Disconnect the IAC Motor harness connector.
Disconnect the PCM harness connectors.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (K39) IAC Return circuit from the IAC Motor harness connector to the appropriate terminal of special tool #8815.7
Is the resistance below 5.0 ohms?
  1. Yes --> Go To 7
  2. No --> Repair the open in the (K39) IAC Motor Control circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
7
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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