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P1509 Diagnostic Trouble Code Discussion for June 2011

Idle Speed High - IAC System Not Responding

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Trouble Ticket Help Requests for DTC P1509
Help Request Posted
1999 Honda Civic Si 1.6L Poor Idle Quality, Surge, MIL Lamp on VIN: 1HGEJ8271X
P1509: Idle Air Control System High RPM. ... this is my daughters car. P1509 will not clear, replaced throttle body assembly, checked grounds at tstat housing, bled coolant, no change. TPS checks ok, shows 9.8%throttle position at closed, jumps to 30% as you accelerate, and goes up in approx 10% incr...
June 28, 2011