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P1491 Diagnostic Trouble Code Discussion for May 2004

EVAP Vacuum Cut Valve/Bypass Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1491
Help Request Posted
1996 Honda Accord LX 2.2L MIL Lamp on VIN: 1HGCD5636T
P1491: EGR Valve Lift Sensor Insufficient Flow Detected. ... customer brought in his 1996 Honda Accord LX, with a check engine light on. After scanning the PCM (OBDII) I extracted code P1491 Insufficient EGR Valve Lift Detected. Then I went to ALLDATA to find the appropriate pinpoint test. After checking the EGR val...
May 11, 2004
2000 Jeep Cherokee Sport 4.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1J4FF4852Y
P1491: rad fan control circut open or short. Help!!! Dealer car, customer bought it and returned with jeep running rough and popping through the intake at idle. Check engine light on with above codes, cleared codes, only fan relay code is hard intill vehicle warms up. A/c inop. turn a/c on A/c code appea...
May 27, 2004