DJinn Posted June 3, 2017 Share Posted June 3, 2017 Okay so here's what we've got up here. A customer came in with a no start no crank condition with a check engine light on. Connection of Snap-On Verus pulled our attention to a PCM failure, using a DVOM from fluke our tech diagnosed internal resistance was to high for PCM function and asked to replace the part. PCM was replaced and and some symptoms had gone away however now we had some new codes. Another tech took the job and using his fluke DVOM and verus live data has confirmed PCM function at PCM however when trying to reprogram PCM or diagnose PCM it will not communicate to anything else. I've stuck my newest tech fresh from college on it to see if maybe a younger fresher mind can find it and I've watched him scratching his head with a DVOM, O-Scope, and the Verus in his hand. I'm sure we're probably over thinking something about this but I'm not sure what. Currently we're pulling abs code, and a few others I can post detailed if needed but nothing on PCM until you try to talk to the PCM. Quote Link to comment Share on other sites More sharing options...
akirby Posted June 3, 2017 Share Posted June 3, 2017 Wiring harness? Quote Link to comment Share on other sites More sharing options...
DJinn Posted June 3, 2017 Author Share Posted June 3, 2017 Maybe could explain the new faults they are a C1095-Hydronic pump circuit fault, B1354- Ignition run/accessory circuit fault, B1458- Wiper washer pump circuit fault, P0500- Vehicle speed sensor fault. Quote Link to comment Share on other sites More sharing options...
fordtech1 Posted June 3, 2017 Share Posted June 3, 2017 The abs codes and gem module codes, I would ignore until the original concern is diagnosed. They aren't contributing to the pcm communication issue. When you run a network test with the scan tool, Everything passes except pcm correct? Quote Link to comment Share on other sites More sharing options...
fordtech1 Posted June 3, 2017 Share Posted June 3, 2017 You have tried a new pcm and same result. The MIL illuminates when the key in in run correct? Does the light go out during cranking? Could be anything from a harness issue to a sensor shorting out Reference voltage. Quote Link to comment Share on other sites More sharing options...
twintornados Posted June 3, 2017 Share Posted June 3, 2017 Did you jiggle the handle? Quote Link to comment Share on other sites More sharing options...
DJinn Posted June 4, 2017 Author Share Posted June 4, 2017 Thank you I will run these past my tech in the AM. Yes when key is on MIL stays lit up even during crank and another PCM has shown the same. I'll update his findings on what you've all suggested. Quote Link to comment Share on other sites More sharing options...
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