Actually, only the crank signal is critical. You may have noticed on your harmonic balancer (which we have all changed) that there were two setss of rings with spaces. One is a 3X and the other is a 6X (or something like that). The hall effect sensor (cam sensor) is only required to signal the fuel injectors to fire within the first revolution of the engine during cranking. This facilitates quicker starting. The engine actually times itself off of the crank sensor. The signal (AC) is conditioned in the ICM to DC then sent to the PCM.
My mother-inlaws Bonneville SE (1990) lost the cam signal out of the ICM which set off the Check Engine light. The car runs fine and the length of the crank time is only marginally longer and she doesn't even notice it at all. I told her to leave it as it is until the ICM fails completely. It has been 5 years.
Originally Posted by willwren
If the Cam sensor signal is lost, the ICM won't know what to do. I'd suspect the cam sensor at this point. Has it been changed yet? Both the cam sensor and the crank sensor are critical inputs to the spark reference circuit. The cam sensor also provides inputs to the injectors.
Code 58 is Vats. Have you tried a spare key? Had a new one made by a locksmith (there are only 12 different resistances). Or simply try cleaning the contacts on the key with rubbing alcohol and a cotton swab, and the same thing for the contacts in the ignition switch itself.
1992 Bonneville SSEi
White, grey Leather interior.
Tinted windows and blackouts on headlights.
Custom high flow exhaust, Everything replaceable - DONE
300 000 kms original engine, tranny 2 rebuilds.
Playboy Bunnies Embossed in Tint. Oh Yah!
Ever Seen a Polar Bear in a Snow Storm?