The Saga Continues - My Wife's Discovery, No Start, Continued Diagnosis
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Camel Trophy
Joined: Aug 2014
Posts: 4,743
Likes: 985
From: Southwestern Virginia
Sounds like it fires with the key in the start position, but dies in the run position?? If that’s so, then look for power with the key in the run position down the line. ??? The fuel pump doesn’t run unless the engine is turning over, needs an oil pressure signal. Idk. Couple more ideas
I know old GM's we're like that, but I don't believe disco's are. I drove my '03 about 2 miles with zero oil pressure measured on my gauge once.
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Camel Trophy
Joined: Aug 2014
Posts: 4,743
Likes: 985
From: Southwestern Virginia
Similar to the problem I'm fighting. My research has found that the relay/fuse/IDM inside can cause a no spark condtion, so I had the idea to take it out and see if there were cold, cracked or blown out solder joints. Well, forget that idea. There are 2 boards sandwiched together by 11,257 pins all around the edge like a cage, and getting them unsoldered looked like more work than I was going to bother with.
So, while I'm here-Rave shows the ECU under the right side kick panel, but it is also showing it on a RH drive vehicle. Is it still on the right side on our NA trucks or is it over on the left? I want to check for CKP signal at the ECU before bothering with any other checks.
So, while I'm here-Rave shows the ECU under the right side kick panel, but it is also showing it on a RH drive vehicle. Is it still on the right side on our NA trucks or is it over on the left? I want to check for CKP signal at the ECU before bothering with any other checks.
Three Wheeling
Joined: Mar 2021
Posts: 72
Likes: 6
Can you put a Noid light on the injectors? If you can verify that the computer is trying to fire the injectors you can really narrow down your diagnosis. Harbor freight has a set for like $35 but I don't know if they will work for the Disco, maybe some can verify that.
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Camel Trophy
Joined: Aug 2014
Posts: 4,743
Likes: 985
From: Southwestern Virginia
So this morning we also had no spark. I swapped the fuse boxes out of my running Disco just to try it. Still no change. Fuel pump didn't run, still no spark again. It started raining so I did only check spark on #1.
When I changed the fuse boxes I did find one of the connections loose and a little burned. What does this wire go to? My '00 doesn't have it at all. It had gotten pretty hot, the plastic around it was melted. I cleaned the eyelet up before reconnecting it in the replacement fuse box.
I threw both fuse boxes from my wife's D2 back in my D2 and it started up just fine.
With now losing spark I'm even more confused. I feel like we're fighting on multiple fronts here. The only think I know that would cause both fuel pump not to run and no spark is the CPS. I had a spare on the way anyway to take with me to Uwharrie, so I'm thinking it'll try throwing it in just to see if it makes a difference.
Otherwise my concern is a wiring harness issue.
Burned connection:
When I changed the fuse boxes I did find one of the connections loose and a little burned. What does this wire go to? My '00 doesn't have it at all. It had gotten pretty hot, the plastic around it was melted. I cleaned the eyelet up before reconnecting it in the replacement fuse box.
I threw both fuse boxes from my wife's D2 back in my D2 and it started up just fine.
With now losing spark I'm even more confused. I feel like we're fighting on multiple fronts here. The only think I know that would cause both fuel pump not to run and no spark is the CPS. I had a spare on the way anyway to take with me to Uwharrie, so I'm thinking it'll try throwing it in just to see if it makes a difference.
Otherwise my concern is a wiring harness issue.
Burned connection:
Thread Starter
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Camel Trophy
Joined: Aug 2014
Posts: 4,743
Likes: 985
From: Southwestern Virginia
Can you put a Noid light on the injectors? If you can verify that the computer is trying to fire the injectors you can really narrow down your diagnosis. Harbor freight has a set for like $35 but I don't know if they will work for the Disco, maybe some can verify that.
Recovery Vehicle
Joined: Dec 2012
Posts: 820
Likes: 230
From: Boston, MA
You might want to double check the RAVE but CPS only stops spark and not the fuel pump. The fuel pump should work under any conditions as long as the key is in position II.
Your issue does sound like an electrical problem. Have you printed of the starter/ ignition circuit diagrams and chased the paths?
Your issue does sound like an electrical problem. Have you printed of the starter/ ignition circuit diagrams and chased the paths?
Recovery Vehicle
Joined: Feb 2019
Posts: 1,222
Likes: 595
From: Jacksonville, FL
Got a noid kit I can bring to Uwharrie. If you want it, it’s yours.
Thread Starter
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Camel Trophy
Joined: Aug 2014
Posts: 4,743
Likes: 985
From: Southwestern Virginia
You might want to double check the RAVE but CPS only stops spark and not the fuel pump. The fuel pump should work under any conditions as long as the key is in position II.
Your issue does sound like an electrical problem. Have you printed of the starter/ ignition circuit diagrams and chased the paths?
Your issue does sound like an electrical problem. Have you printed of the starter/ ignition circuit diagrams and chased the paths?
Thread Starter
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Camel Trophy
Joined: Aug 2014
Posts: 4,743
Likes: 985
From: Southwestern Virginia
Hey, I appreciate that very much. If you want something for it let me know, whether it be a little cash or some kind of parts.
