P1509 Diagnostic Trouble Code Discussion for June 2011
Idle Speed High - IAC System Not Responding
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| 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 |
