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SportTrac Discussion
Projects
Truck goes crazy when key is out of the ignition, Instrument cluster goes on and off, beeps, ...but I don't think it's the actual instrument cluster.
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<blockquote data-quote="Evox" data-source="post: 1041490" data-attributes="member: 74754"><p>It's at the Ford dealership now. So hopefully, they'll be able to nail it down. </p><p></p><p>I'm betting it's the PCM, PCM connector (although I inspected the plug, and it looks clean to me), every plug I checked, every ground I checked all look fine. For some reason, the PCM is coming on when the vehicle is off. I can hear the relay clicking when the ignition is off. I changed the PCM relay, and it's still energizing randomly when the truck is off. The other clue is the OBD port is energized when the truck is off, which, if memory serves this is not a normal situation. Running it throws ZERO codes. Turn it off and let it sit for a while with the battery connected, and it throws a slew of codes that point to the PCM itself, the cluster, or the ignition switch (which I just replaced) or ignition switch wiring harness, which I inspected and looks good. </p><p></p><p>I think the codes are being thrown simply because the PCM is energizing and running through its start diagnostics. With the ignition off, of course, it's going to come back with all sorts of sensors not reporting. So my money is on the PCM. But we'll see.</p></blockquote><p></p>
[QUOTE="Evox, post: 1041490, member: 74754"] It's at the Ford dealership now. So hopefully, they'll be able to nail it down. I'm betting it's the PCM, PCM connector (although I inspected the plug, and it looks clean to me), every plug I checked, every ground I checked all look fine. For some reason, the PCM is coming on when the vehicle is off. I can hear the relay clicking when the ignition is off. I changed the PCM relay, and it's still energizing randomly when the truck is off. The other clue is the OBD port is energized when the truck is off, which, if memory serves this is not a normal situation. Running it throws ZERO codes. Turn it off and let it sit for a while with the battery connected, and it throws a slew of codes that point to the PCM itself, the cluster, or the ignition switch (which I just replaced) or ignition switch wiring harness, which I inspected and looks good. I think the codes are being thrown simply because the PCM is energizing and running through its start diagnostics. With the ignition off, of course, it's going to come back with all sorts of sensors not reporting. So my money is on the PCM. But we'll see. [/QUOTE]
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SportTrac Discussion
Projects
Truck goes crazy when key is out of the ignition, Instrument cluster goes on and off, beeps, ...but I don't think it's the actual instrument cluster.
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