check engine light on code is p1491
#1
check engine light on code is p1491
Hello my check engine light came on. I pulled the code p1491 (using innova code reader). The booklet interprets this as "egr valve lift insufficient detected" . Can anyone tell me what this means, what I should be looking at, which component needs attention, replacement etc? Thanks in advance
#4
P1491 is EGR valve insufficient lift. This means ECM commanded EGR valve movement and detected insufficient movement. It can be a failed EGR valve movement, vacuum supply fault, vacuum switching valve fault, or faulty lift sensor. Usual reasons are loss of vacuum through damaged/missing vacuum lines or faulty vacuum switch valve.
There is a long diagnostic to run this to ground. I did not have the obd2 procedure for this model but did have equivalent Obd1 procedure (attached) from 1994 manual.
good luck
There is a long diagnostic to run this to ground. I did not have the obd2 procedure for this model but did have equivalent Obd1 procedure (attached) from 1994 manual.
good luck
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ddold@gkschools.org
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01-29-2008 03:35 PM