elect throttle body troubles?
Thread Starter
7th Gear
Joined: Mar 2007
Posts: 7
Likes: 0
elect throttle body troubles?
does any one have any info on any elect throttle body problems. my 98 coupe has generated a code p1518,check engine light on,and reducded power message on the cluster.the drivability problem cleared after one restart.check engine lite went off after 2 restarts. performed all pinpoint tests in service manual for code p1518 with no problem found.just wondering if there is any known problems with the throttle body's.being a ford tech i know we have tons of trouble with our elect throttle body's.can never find any problems with them but replacing them always cures the problems.sure your wondering what a ford tech is doing driving a chevrolet.well a mustang is just a car. a corvette is a dream come true.thanks for the help.
Racer
Joined: Dec 2005
Posts: 407
Likes: 2
From: Mesquite, Texas
Been there....done that.
As a tech, you probably already know that elec. throttle systems are pretty much the same.....acc. pedal position sensor, throttle position sensor, throttle actuator motor, and a module that monitors and keep everybody behaving properly. If any particular signal value gets out of range, the DTC is set, and generally results in the "Reduced Engine Power" mode. On C5's the reduced power mode will clear after 1 ignition cycle, as long as the module doesn't sense any out-of-range conditions. The Check Engine light will also clear after 2 ignition cycles, again, as long as no codes are set.
In my particular case, I found a ground wire inside the front passenger-side wheelhouse that had been mysteriously chewed up in a couple of places. (Previous owner lived in a rural area - could have been a rodent that did the damage.) Re-spliced a new section of wire onto it, and problem virtually disappeared. I say virtually because since then, it has still happened to me a couple of times in the last year and a half, but I think adverse driving conditions were to blame for those times. Prior to repairing, it happened quite often - 2, 3, 4 times a day. It was a PITA!!
Main point: Check your grounds, and get a set of GM service manuals. They'll show you all the ground points, schematics, etc.
Mike
As a tech, you probably already know that elec. throttle systems are pretty much the same.....acc. pedal position sensor, throttle position sensor, throttle actuator motor, and a module that monitors and keep everybody behaving properly. If any particular signal value gets out of range, the DTC is set, and generally results in the "Reduced Engine Power" mode. On C5's the reduced power mode will clear after 1 ignition cycle, as long as the module doesn't sense any out-of-range conditions. The Check Engine light will also clear after 2 ignition cycles, again, as long as no codes are set.
In my particular case, I found a ground wire inside the front passenger-side wheelhouse that had been mysteriously chewed up in a couple of places. (Previous owner lived in a rural area - could have been a rodent that did the damage.) Re-spliced a new section of wire onto it, and problem virtually disappeared. I say virtually because since then, it has still happened to me a couple of times in the last year and a half, but I think adverse driving conditions were to blame for those times. Prior to repairing, it happened quite often - 2, 3, 4 times a day. It was a PITA!!
Main point: Check your grounds, and get a set of GM service manuals. They'll show you all the ground points, schematics, etc.
Mike
