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.
POSSIBLE CAUSES
IAC MOTOR OPERATION
IAC MOTOR
(K610) IAC MOTOR CONTROL CIRCUIT SHORTED TO GROUND
(K961) IAC RETURN CIRCUIT OPEN
(K961) IAC RETURN CIRCUIT SHORTED TO GROUND
(K610) IAC MOTOR CONTROL CIRCUIT OPEN
PCM
TEST ACTION APPLICABILITY
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 DRBIIIt, read the IAC Current.
Is the IAC Current below 146 mA?
All
Yes → Go To 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?
All
Yes → Go To 3
No → Replace the IAC Motor.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
192
DRIVEABILITY - NGC
To Next Page
Loading...
Need help?
General
