Chrysler 300M 2002 Service Manual page 2638

Symptom:
P0508-IAC VALVE SENSE CIRCUIT LOW
When Monitored and Set Condition:
P0508-IAC VALVE SENSE CIRCUIT LOW
When Monitored: Engine running. Battery voltage greater than 10 volts.
Set Condition: The IAC sense circuit is less than 175 mA. One Trip Fault.
INTERMITTENT CONDITION
IAC MOTOR
IAC MOTOR DRIVER CIRCUIT SHORTED TO GROUND
IAC MOTOR SENSE CIRCUIT OPEN
IAC MOTOR SENSE CIRCUIT SHORTED TO GROUND
IAC MOTOR DRIVER CIRCUIT OPEN
PCM
TEST
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?
Yes → Go To 2
→ Go To 8
No
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?
Yes → Go To 3
→ Replace the IAC Motor.
No
POSSIBLE CAUSES
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - NGC
209
APPLICABILITY
All
All