Computer Diagnostics and Tuning Technical discussion on diagnostics and programming of the F-body computers

whats this mean??

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Old Jun 29, 2007 | 06:54 PM
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whats this mean??

Ok guys i threw a code and the car runs fine jsut the engine light stays on the code is p1657 manfacurere control aux inputs and outputs??? what does this mean anyone???
Old Jun 29, 2007 | 07:11 PM
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According to obdii.com it's a Skip Shift Control Circuit code.
Old Jun 30, 2007 | 12:29 PM
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Did you disconnect the skip shift solenoid? That will set the code, and can only be eliminated by either spending $25-30 on a "skip shift eliminator", or buying a 2.2Kohm resistor and plugging it into the harness connector for the solenoid. If you still have your skip shift solenoid connected, it would be indicating a faulty solenoid.
Old Jun 30, 2007 | 11:00 PM
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ya i bought the skip shift elim and had the code clear it keeps coming back though
Old Jun 30, 2007 | 11:24 PM
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The code sets when the PCM sees near +12V on the circuit when the solenoid is switched on, or near 0V when the solenoid it turned off. Could be a wiring problem or damage to the connector. Could be a blown fuse, but that fuse supplies several other loads, like the reverse lockout solenoid, EGR vacuum solenoid and O2 sensor heaters, so a blown fuse would set several other codes as well.
Old Jul 1, 2007 | 09:45 AM
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were is this fuse ur talking about under the hood or inside also is it one of those clear fuses or the big grey blocks
Old Jul 1, 2007 | 10:54 PM
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Always hard to answer a question about where a wire is located, or where a fuse is located without knowing the year of the car. Why not add a "signature" showing basic info about your car, like the year, model, trans type, and any major mods. It will help you get better answers.

In the 95 LT1, the skip shift solenoid is powered of fuse #6 in the underhood convenience box. The wire for the skip shift solenoid runs from PCM pin B13, gray wire, to the solenoid. But without knowing the year of the car, this may be totally useless information.
Old Jul 5, 2007 | 03:08 PM
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sorry its been a few days its a 96 z and the only mods are the skip shift, cai, maf, and airfoil other than that its all stock




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