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P1491 Diagnostic Trouble Code Discussion for March 2007

EVAP Vacuum Cut Valve/Bypass Circuit Malfunction


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Trouble Ticket Help Requests for DTC P1491
Help Request Posted
2002 Dodge Ram 1500 Truck 4.7L MIL Lamp on VIN: 1B7HU16N02
P1491: Cooling Fan Control Relay Circuit Malfunction. ... help you can give. Truck was brought in about a month ago with MIL on. Found code P1491. Replaced condenser fan motor and harness, had PCM flashed with latest updates, brought vehicle back to shop and installed fuse in #39 cavity. Went to drive truck and f...
March 01, 2007
1998 Honda Accord LX 2.3L MIL Lamp on VIN: 1HGCG5646W
P1491: EGR Valve Lift Sensor Insufficient Flow Detected. hi,this thing is beating me.got a p1491 code cleaned egr port it was half way plugged. if i power the egr valve with car running it stalls. if i power egr vale with engine off and moniter the lift senser i get a max. of 3.54 volts,is this high enough? my koer ...
March 13, 2007
1998 Dodge Caravan 2.4L MIL Lamp on, eng oil lamp on VIN: 2B4FP25B9W
P1491: Radiator Fan Control Relay Circuit Malfunction. ... light illumination.Getting code P1491-radiator fan relay short or open.Replaced radiator fan relay.Reset PCM.Check engine light will illuminate within a short road test and the engine oil light will also illuminate simaltaneously with the check eng light.T...
March 20, 2007