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Trailering
Joined: Nov 2021
Posts: 16
Likes: 5
No start
Well I fired my truck up this morning for work and it ran fantastic as normal all the way to work. Went to start it at end of the day and I have no WTS light and it just cranks, obviously no power to pcm. Checked all fuses visually and with a meter and all were good. Pcm relays are working as is the diode obviously. What's next after that? Truck is a e99 7.3 zf6. Changed injectors a month ago and the pcm had a broken pin. Ordered pcm from DTS and the truck has ran awesome ever since until this random thing. Once again no fuses were blown(I pulled every fuse from under dash and under hood and ohmed each of them out) everything was good. Now for the diode I of course left my good Fluke meter at home and used a cheapy, it showed OL on one end and 13-14 ohms on the other. I have read on this forum the cheap meters can't test diodes. Is this true? I work in the woods so this is where the truck is at currently. From what I have read though the forums I believe i have tested everything outside of tracing wires. Where to next? Thank you
Logistics Pro
Joined: May 2017
Posts: 4,667
Likes: 1,455
From: Muskogee, Ok
Do you have power @ the cigarette lighter? Not the "power port" the lighter.
Replaced fuse #30 under the dash?
Swapped IDM relay for the AC blower one?
Jiggled the ignition key a few times?
Replaced fuse #30 under the dash?
Swapped IDM relay for the AC blower one?
Jiggled the ignition key a few times?
Tuned
Joined: May 2021
Posts: 363
Likes: 121
From: Montana
Something similar happened to me a couple of weeks ago, ended up being a bad EBP sensor that shorted and took PCM off line.
Try unplugging each sensor monitored by the PCM one by one and check for WTS light after each one.
Also, do you have a chip installed?
Try unplugging each sensor monitored by the PCM one by one and check for WTS light after each one.
Also, do you have a chip installed?
Tuned
Joined: May 2021
Posts: 363
Likes: 121
From: Montana
This is the guy who got me back on the road!
Tuned
Joined: Jan 2023
Posts: 396
Likes: 171
If you have power at the fuses for the pcm, the sensors on the ref circuit are accelerator pedal sensor, map, icp, cps, and ebp. Since you are traveling to the rig you might want to print out a pcm pinout diagram. From memory I think the grounds are near the master cylinder.
You can also swap the pcm relay, even if it clicks it might still be bad and it's quick and easy.
You can also swap the pcm relay, even if it clicks it might still be bad and it's quick and easy.
Thread Starter
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Trailering
Joined: Nov 2021
Posts: 16
Likes: 5
yes have power at cig lighter, fuse 30 changed, swapped relay with blower one, ignition has been jiggled plenty since this happed last night
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Trailering
Joined: Nov 2021
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I disconnected the 40 pin plug on the driver's side valve cover and still nothing. Is there a diagram of the pins floating around anywhere?
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Trailering
Joined: Nov 2021
Posts: 16
Likes: 5
I unplugged the valve cover plug to troubleshoot the sensors being shorted out. I read you can disconnect that instead of each individual sensor.
Tuned
Joined: Jan 2023
Posts: 396
Likes: 171
I think you still have map, and accelerator. Are you checking a wire for 5v while doing this?
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Trailering
Joined: Nov 2021
Posts: 16
Likes: 5
I haven't no, im at work right now. I had read to pull the plug and see if the wts light came back so thats all the farther I've gotten. Wjere is the accelerator sensor? I will test for 5v tonight when I get off
Tuned
Joined: Jan 2023
Posts: 396
Likes: 171
The accelerator pedal, just unplug the connector. Map is on the right side firewall area.
I'm not sure what input the pcm uses to turn on the wait to start light, but the 5v ref should be there if it was a bad sensor and you unplugged the valve cover 42 pin connector. I prefer isolating to just the sensor, unplugging each one.
I'm not sure what input the pcm uses to turn on the wait to start light, but the 5v ref should be there if it was a bad sensor and you unplugged the valve cover 42 pin connector. I prefer isolating to just the sensor, unplugging each one.
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