P0508

Test 1 - Test 2:

Test 3 - Test 7:

SYMPTOM
P0508-IAC VALVE SIGNAL CIRCUIT LOW

WHEN MONITORED
Engine running. Battery voltage greater than 10 volts. IAC motor operating.

SET CONDITION
The PCM senses a short to ground or battery voltage on the Linear Idle Air Control (LIAC) control circuit for 2.75 seconds while the IAC motor is active.

POSSIBLE CAUSES
- IAC motor operation
- IAC motor
- (K61) IAC control circuit shorted to ground
- (K961) IAC signal circuit open
- (K961) IAC signal circuit shorted to ground
- (K61) IAC control circuit open
- PCM