IDM location needed
Post Fiend
Joined: Mar 2007
Posts: 9,010
Likes: 5
From: Johnson City, TN.
I studied the IDM pin plug a bit. I noticed that all of the cylinders that are out are in the same proximity of each other. Coincidence?? They are all on the left side of the center whereas the ones that are functioning are on the right side. Could the plug on the vehicle be bad or have corrosion or the pins just slid back in the plug in that area? I would ohm out the 4 individual plugs that don't work on the vehicle side of the plug since you said this IDM works on another vehicle.
They were pins 8,9,21,22
Just a thought from my feeble mind. You are in good hands here these guys know what they are talking about
Cuda thanx for the diagram.
They were pins 8,9,21,22
Just a thought from my feeble mind. You are in good hands here these guys know what they are talking about
Cuda thanx for the diagram.
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New User
Joined: May 2008
Posts: 16
Likes: 1
Wait to start light comes on. I originally looked at this vehicle for my friend. It would not start and he had burned out the starter trying to start it. I replaced the starter and figured a fuel filter would solve the problem. It did not and that is when I started on this journey.
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New User
Joined: May 2008
Posts: 16
Likes: 1
I checked all the pins and even though there was some water intrusion in the connector there was no corrosion. I took the connector apart and checked from the back side as well. I had also checked the circuits when I had everything apart and everything tested okay.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
When I removed the IDM I checked the wiring from the IDM connector to C101? (main harness connector) and then from C101? to injector connections. Performed continuity test and checked for shorts to ground. All wiring tested ok. I inspected also for chafs along the main harness and injector harness. I had no change in vehicle performance or starting ablity while moving wires and shake test.
Thank you for the extra check though.
Dave
Thank you for the extra check though.
Dave
The test I referred to was from C299 above (IDM) to the UVC connectors. IF you get more than 10,000 ohms the harness is shorted out.
Cyl #2 in the UVC (second pin from the front of the engine driver side front connector) to pin #22 in the IDM it's a white wire (W) circuit 556
Cyl #3 in the UVC (4th pin from the front of the engine in passenger side front connector) to pin #23 in the IDM it's a Brown w/ yellow stripe wire circuit 557
ect ect.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
I studied the IDM pin plug a bit. I noticed that all of the cylinders that are out are in the same proximity of each other. Coincidence?? They are all on the left side of the center whereas the ones that are functioning are on the right side. Could the plug on the vehicle be bad or have corrosion or the pins just slid back in the plug in that area? I would ohm out the 4 individual plugs that don't work on the vehicle side of the plug since you said this IDM works on another vehicle.
They were pins 8,9,21,22
They were pins 8,9,21,22
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
A buzz test will let you know if the electrical part is getting to the injectors. To bad you aren't closer I would do it for you. You coud look around the New York sub forums and ask around.
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New User
Joined: May 2008
Posts: 16
Likes: 1
The connector I thought maybe was C101 is the large connector by the alternator. The harness goes to the injectors. The other end goes across to the IDM. Before I had the pin numbers I ran a continuity test from the injector harness to the connector and connector to the IDM connector. I was able to find out which pins went where and tested from there.
All the info has been very helpful. I am going to look for a 7.3 manual to referance for future repairs. I have a Chiltons Full Size Van 89-96 manual but it is very vague on diesel engine diag.
All circuits tested okay but I will double check just to be sure.
Thanks
I will try to find someone to buzz test.
Dave
All the info has been very helpful. I am going to look for a 7.3 manual to referance for future repairs. I have a Chiltons Full Size Van 89-96 manual but it is very vague on diesel engine diag.
All circuits tested okay but I will double check just to be sure.
Thanks
I will try to find someone to buzz test.
Dave
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Check ebay for repair manuals on CD or DVD, I got one for $28 bucks shipped. They come and go so keep looking.
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