[Edo501]

Hi I have this error code and just can't, do not know how to fix it. It says idle Air Control Valve Sense Circuit Low. I found barely something on the internet but nothing concrete. Does someone know what this is about and how to fix it?

[scottydog]

P0508-IDLE AIR CONTROL VALVE SENSE CIRCUIT LOW
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
² When Monitored:
Engine running. Battery voltage greater than 10 volts. IAC motor operating.
² Set Condition:
The PCM senses a short to ground or battery voltage on any of the Linear Idle Air Control (LIAC) control
circuits for 2.75 seconds while the IAC motor is active. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes
(K61) IAC CONTROL CIRCUIT SHORTED TO GROUND
(K961) IAC SIGNAL CIRCUIT OPEN
(K961) IAC SIGNAL CIRCUIT SHORTED TO GROUND
(K61) IAC CONTROL CIRCUIT OPEN
IAC MOTOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
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 below 146 mA?
Yes >> Go To 2
No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 550 ENGINE ELECTRICAL DIAGNOSTICS WK
P0508-IDLE AIR CONTROL VALVE SENSE CIRCUIT LOW (CONTINUED)
2. IAC MOTOR
Turn the ignition off.
Disconnect the IAC Motor harness connector.
Remove the IAC Motor.
NOTE: Inspect the IAC air passages for restrictions 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
No >> Replace the IAC Motor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)