Error Code P1670 QDM questions - Page 8 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-31-2010, 09:11 PM   #71
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Start from scratch again, and this time pull your A/C relay.

I believe the TCC/Antilock switch is with the brake light switch. When you step on the brake, a connection is made telling your PCM to unlock the TCC(if its locked up) and also telling the ABS that yea, the breaks are being applied and if need be, go ahead and activate ABS. In Mike lamens terms.
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Old 02-01-2010, 08:27 AM   #72
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You don't mention unhooking the AC relay. Had you tried that?
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Old 02-01-2010, 10:17 AM   #73
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Have not tried that yet I am going to first chance I get today. Unplugging the A/c relay that is.
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Old 02-01-2010, 10:18 AM   #74
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Hopefully that'* the ticket. Crawling under the dash is more work.
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Old 02-01-2010, 11:23 AM   #75
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Unhooked the a/c relay and the fuse pops immediately after starting the car. I am going to trace the wires where they run from the fuse panel to the components and see if I can find the short. I might end up just running a new wire so I need to find where they end. I know the ones at the fan relays so I started there. Any tips or more info would be welcome
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Old 02-01-2010, 11:47 AM   #76
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Quick way to do it... see the pins I listed. Test for continuity to ground on those pins. When you find one that has it.. that'* your culprit.

They all appear to go through P100, I dunno where that pass through is..but most likely it'* the driverside passthrough.
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Old 02-01-2010, 11:52 AM   #77
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Yeah they all have continuity to ground. Its one feed coming off the fuse panel and at some point they branch off. So I still have to trace it out unfortunately. And yes it is the driver side pass through.
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Old 02-01-2010, 01:15 PM   #78
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Unhook the connector to the pcm. Maybe it'* feeding back ground on you. That should free them up from grounding.
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Old 02-01-2010, 01:35 PM   #79
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PCM unplugged and The feed from the fuse panel still grounds. In the process of tracing the wire looking for the short. I want to try to find where it is shorting out to make sure that nothing else is on the verge of shorting out in the same place.
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Old 02-01-2010, 01:58 PM   #80
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Ok, but now test the relay plugs etc on pin 85 etc so you can figure out which one of them is the issue. Then follow it back.
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