Symptom:
P0509-IAC VALVE SENSE CIRCUIT HIGH
When Monitored and Set Condition:
P0509-IAC VALVE SENSE CIRCUIT HIGH
When Monitored: Engine running. Battery voltage greater than 10 volts.
Set Condition: The IAC sense circuit is greater than 980 mA. One Trip Fault.
POSSIBLE CAUSES
IAC MOTOR OPERATION
IAC MOTOR
(K961) IAC RETURN CIRCUIT SHORTED TO VOLTAGE
(K610) IAC MOTOR CONTROL CIRCUIT SHORTED TO VOLTAGE
(K961) IAC RETURN CIRCUIT SHORTED TO (K610) IAC MOTOR CONTROL CIRCUIT
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 above 999 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.
With the DRBIIIt, monitor the IAC Current.
Turn the ignition on.
Does the DRBIIIt display IAC Current at 0mA?
All
Yes → Replace the IAC Motor.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 3
195
DRIVEABILITY - NGC
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