error code
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Elder User
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From: Small acerage in Nebraska
error code
Hi all me again. Something still not right with my 91.
Checked error codes and got 18 on the continuous. I replaced the TFI icm with a brand new unit, drove it and code is still there. Checked for and had voltages at both SPOUT and PIP. Am going to order new ECM, $100 gamble I hope it works ok. Wondering if the ECM got damaged in the crash somehow. Only way to find out exactly what is/isn't working right is a $475 SnEEC-IV from Race Systems. Could have used thi in the past, would use it in the future,might get one soon. Any other guesses?
Checked error codes and got 18 on the continuous. I replaced the TFI icm with a brand new unit, drove it and code is still there. Checked for and had voltages at both SPOUT and PIP. Am going to order new ECM, $100 gamble I hope it works ok. Wondering if the ECM got damaged in the crash somehow. Only way to find out exactly what is/isn't working right is a $475 SnEEC-IV from Race Systems. Could have used thi in the past, would use it in the future,might get one soon. Any other guesses?
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
You can do a series of resistance tests across various pins of the ECM to confirm whether or not the ECM has failed. Damaged wiring harness or a failing TFI module can trigger Code 18 as well. You say the truck was in an accident... I'd do a thorough inspection of the main wiring harness in the engine bay. I only caution you to try to rule out other possibilities before spending the money on a new computer simply because they have such a low failure rate.
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Elder User
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From: Small acerage in Nebraska
I'll clarify that the ECM was from a truck that was in an accident
I looked over the harness carefully, nothing to suggest a short or damage. even disconnected the ECM, no bent pins,no moisture, etc
I looked over the harness carefully, nothing to suggest a short or damage. even disconnected the ECM, no bent pins,no moisture, etc
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
Ah, ok. Hard to tell but if you want to take resistance readings across some of the pins I can tell you which ones and what the readings should be.
Check resistance between pin 4 and pins 40, 46 and 60 with the 60-pin connector removed from the ECM. Resistance must exceed 10,000 ohms between pin 4 and each of the other pins. If not, disconnect the ignition coil primary side and take the readings again. If any don't exceed the 10,000 ohm mark the ECM is the culprit.
Check resistance between pin 4 and pins 40, 46 and 60 with the 60-pin connector removed from the ECM. Resistance must exceed 10,000 ohms between pin 4 and each of the other pins. If not, disconnect the ignition coil primary side and take the readings again. If any don't exceed the 10,000 ohm mark the ECM is the culprit.
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Elder User
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From: Small acerage in Nebraska
Still not sure what is going on with it, spent 3hrs pulling tape and loom, probing, etc on the wire harness. I replaced the ECM. Error 18 still there. With the ECM connected, SPOUT wire (yellow/green) shows 50K ohms from connector at dist to ground. This resistance is not there when ECM is disconnected. Measurement beetween 46 and 60 was an OL read, might've had the wrong pin. Spout wire not grounding to the bare wire or the foil for certain. Does this help? :S
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From: edmonton ab
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From: Small acerage in Nebraska
OK, I think I found a problem, not sure how to fix it yet.
At the Ford EFI webpage, in the wiring harness section. EEC pin 30 is SIG RTN manual only. EEC pin 30 is ground , AT only. I need to know which connector/wires are involved with this, then where they are supposed to be. Further down there are diagrams of black and brown connectors(Mustang harness?) that don"t match to well with anything I can find. The right pics would help me alot.
At the Ford EFI webpage, in the wiring harness section. EEC pin 30 is SIG RTN manual only. EEC pin 30 is ground , AT only. I need to know which connector/wires are involved with this, then where they are supposed to be. Further down there are diagrams of black and brown connectors(Mustang harness?) that don"t match to well with anything I can find. The right pics would help me alot.
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From: Small acerage in Nebraska
Update. As of this morn, (It's 1:00 AM) I finally got the all clear from the ECM. The problems I have found so far all have to do with compatability with the89 engine harness to the 91 harness (fender to the ECM). Tach and a few other wires went into different connectors at the fender, so have spent last 8 hrs with ECM unplugged,tracing pin# xx to dist, egr, tach etc. I think I have most of them sorted out. In hindsight, using the entire 89 harness would have worked, but would me hard to get removed and installed without damaging something. Next is obtain diagram for the dash so I can get all of the wires into right locations and maybe all will be good.
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