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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.
IAC MOTOR OPERATION
IAC MOTOR
(K60) IAC SIGNAL CIRCUIT SHORTED TO VOLTAGE
(K39) IAC MOTOR CONTROL CIRCUIT SHORTED TO VOLTAGE
(K60) IAC SIGNAL CIRCUIT SHORTED TO (K39) IAC MOTOR CONTROL CIRCUIT
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 above 999 mA?
Yes → Go To 2
→ Refer to the INTERMITTENT CONDITION symptom in the
No
2
Turn the ignition off.
Disconnect the IAC Motor harness connector.
With the DRBIII , monitor the IAC Current.
Turn the ignition on.
Does the DRBIII display IAC Current at 0mA?
Yes → Replace the IAC Motor.
→ Go To 3
No
POSSIBLE CAUSES
ACTION
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
DRIVEABILITY - NGC
201
APPLICABILITY
All
All
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