Help troubleshooting
Thread Starter
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Elder User
Joined: Aug 2014
Posts: 617
Likes: 2
Ok, so I got a test light, and I have tested both ye green w/ yellow) wire going into the intertia switch as well as the red (w/yellow) coming back out of it. I am not getting a light on either wire for any amount of time when I turn the key to the run position. So, what is ahead of the inertia switch in the system? Is there any chance that something in the key mech is causing the prob? How about the ECM? Could that play a part?
Thank you!
Thank you!
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Note with the test you did the power is only on for one second so it takes two guys to do the test.
If you still do not get the power for one second with the above note each time you turn on the key then:
You need to ground pin #6 of the self-test plug and turn on the key. You should have power to the inertia switch all the time the key is on.
The self-test plugs location is noted in the diagram in post #9 above.
/
If you still do not get the power for one second with the above note each time you turn on the key then:
You need to ground pin #6 of the self-test plug and turn on the key. You should have power to the inertia switch all the time the key is on.
The self-test plugs location is noted in the diagram in post #9 above.
/
Thread Starter
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Elder User
Joined: Aug 2014
Posts: 617
Likes: 2
Note with the test you did the power is only on for one second so it takes two guys to do the test.
If you still do not get the power for one second with the above note each time you turn on the key then:
You need to ground pin #6 of the self-test plug and turn on the key. You should have power to the inertia switch all the time the key is on.
The self-test plugs location is noted in the diagram in post #9 above.
/
If you still do not get the power for one second with the above note each time you turn on the key then:
You need to ground pin #6 of the self-test plug and turn on the key. You should have power to the inertia switch all the time the key is on.
The self-test plugs location is noted in the diagram in post #9 above.
/
Thank you so much for your help Subford!
Thread Starter
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Elder User
Joined: Aug 2014
Posts: 617
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I just took a look under the hood so I could check out this self-test plug you were referring to. What I found was that the plug wasn't plugged into the protective plug on the fender but was just hanging in there. I don't know how long it's been this way (it wasn't very noticeable because it was kinda tucked under the lip at the top of the fender), but it looks like being unprotected has taken it's toll on it. Here's a pic of it:
It looks fairly corroded. Although the pin you mentioned to ground out for the fuel pump looks ok? In any case, what are the odds that the condition of this plug could cause a problem for the power to the fuel system?
It looks fairly corroded. Although the pin you mentioned to ground out for the fuel pump looks ok? In any case, what are the odds that the condition of this plug could cause a problem for the power to the fuel system?
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
You and stick a paper clip in it from #6 to #2. see image below.
Or you can run a jumper wire from pin #6 to the brake line at the master cylinder or the NEG post of the battery.
Yes it does.
Zero.
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Or you can run a jumper wire from pin #6 to the brake line at the master cylinder or the NEG post of the battery.
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Thread Starter
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Elder User
Joined: Aug 2014
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Based on this info, what is likely going on here?
I greatly appreciate you taking the time to help me troubleshoot this!
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Sounds like a bad computer.
OR a computer without getting a good ground at the fender body ground by the battery (image below).
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OR a computer without getting a good ground at the fender body ground by the battery (image below).
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Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
Yikes! Whoever's truck THAT was musta had trouble.
I disconnected the battery and cleaned those connections and ground points up and applied some NO-OX-ID, a conductive grease. Can't hurt.
I disconnected the battery and cleaned those connections and ground points up and applied some NO-OX-ID, a conductive grease. Can't hurt.
Thread Starter
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Elder User
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I'll let you know how it goes.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
As to why the engine will not start more than likely the fuel injectors are not being fired (grounded) by the computer and the computer may be holding the SPOUT in a high state so you would not have any spark either if that is the case.
Thread Starter
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Elder User
Joined: Aug 2014
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Well, I got the ecm computer replaced. It was a little more of an acrobatic experience than I thought it would be (thankfully I had a buddy who could lend an extra hand to help), but in the end the old one came out and the new went in.
I am thrilled to say that replacing the computer did the trick! My truck runs again for the first time in a month and a half!! Woo hoo!
After buttoning everything back up, I took the old girl for a celebratory spin around the neighborhood. It's been a long road the last few weeks with troubleshooting the no start problem, dealing with AAA braking the steering gear, etc. So it felt great to finally be able start, steer, and drive my truck again!!
A HUGE shoutout to Subford for all of his help and advice along the way!! I can honestly say that he is the reason my truck is running today!
I am thrilled to say that replacing the computer did the trick! My truck runs again for the first time in a month and a half!! Woo hoo!
After buttoning everything back up, I took the old girl for a celebratory spin around the neighborhood. It's been a long road the last few weeks with troubleshooting the no start problem, dealing with AAA braking the steering gear, etc. So it felt great to finally be able start, steer, and drive my truck again!!
A HUGE shoutout to Subford for all of his help and advice along the way!! I can honestly say that he is the reason my truck is running today!
Senior User
Joined: Oct 2006
Posts: 168
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From: Kingwood, Texas
Glad to see you got her running. I've been following along over the past few weeks.
Subford is the man! He's helped me out both directly, and indirectly over the years!
Whenever I need a schematic, I search: "Subford/whatever pic I need", and usually find it.
Subford is the man! He's helped me out both directly, and indirectly over the years!
Whenever I need a schematic, I search: "Subford/whatever pic I need", and usually find it.
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