Looking for input on non functioning TCIL
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5th Wheeling
Joined: Apr 2015
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Looking for input on non functioning TCIL
Update:SOLVED
OK, after reading a bunch of stories of the known wiring issue to the switch (chafing in steering column) I decided to go back in and have a really good look. I disconnected the TCM and pulled the switch from the shifter, then checked for continuity between the 3 switch/led connections in the shift lever. Two had continuity! Not good. So I pulled the dash and steering column covers to look again, and the wiring looked OK. BUT I pulled on the wires a little bit to see the point where is exits the stalk (protected by a little plastic piece, and low and behold, there was a nick through the insulation. I isolated that and disconnected the shift lever harness from the main harness, and still had continuity between 2 of the wires trough the shift lever! At that point I pulled the switch socket out of the end of the shifter, and pulled all the wires as far as I could out that end. That's when I saw a spot that got hot and melted all the insulation off, shorting two wires. I had some similar stranded wire and small heat shrink, so I spliced in new lengths with staggered joints and put it all back together. All OK now!
I've got a new to me 1994 F250 7.3 idi with E4OD. The TCIL LED was illuminating a week ago, but now is not. The switch for tow mode/overdrive lock out is functioning, but the LED is not. I searched a lot and most people say that the LED never fails, BUT...I pulled the switch assembly out of the shift lever to have a look at it. I saw the switch and led and resistor in series. I tested the LED with a multimeter in diode check mode, and it said it was bad. Hmmm, this is rare I thought. So I got a new switch today and popped it in; same thing! No illumination, but the switch functions and locks out 4th fine, and re-enables it. I did take the new switch assembly back out to check the LED, and the new one tests good. The transmission is also shifting fine. Using an OBD1 scanner, I get code 97, Overdrive Cancel Indicator Light Circuit Failure.
So I've just ordered the FSMs on CD so I can have a look a wiring and TCM pinouts, but does anyone have any input on this problem? I did look at the harness in the steering column that goes to the switch/LED assembly. No chaffing or breaks, wires test ok with multimeter. Could it be the TCM itself? Or more likely to be a wire/connection to it?
Thanks for any input!
OK, after reading a bunch of stories of the known wiring issue to the switch (chafing in steering column) I decided to go back in and have a really good look. I disconnected the TCM and pulled the switch from the shifter, then checked for continuity between the 3 switch/led connections in the shift lever. Two had continuity! Not good. So I pulled the dash and steering column covers to look again, and the wiring looked OK. BUT I pulled on the wires a little bit to see the point where is exits the stalk (protected by a little plastic piece, and low and behold, there was a nick through the insulation. I isolated that and disconnected the shift lever harness from the main harness, and still had continuity between 2 of the wires trough the shift lever! At that point I pulled the switch socket out of the end of the shifter, and pulled all the wires as far as I could out that end. That's when I saw a spot that got hot and melted all the insulation off, shorting two wires. I had some similar stranded wire and small heat shrink, so I spliced in new lengths with staggered joints and put it all back together. All OK now!
I've got a new to me 1994 F250 7.3 idi with E4OD. The TCIL LED was illuminating a week ago, but now is not. The switch for tow mode/overdrive lock out is functioning, but the LED is not. I searched a lot and most people say that the LED never fails, BUT...I pulled the switch assembly out of the shift lever to have a look at it. I saw the switch and led and resistor in series. I tested the LED with a multimeter in diode check mode, and it said it was bad. Hmmm, this is rare I thought. So I got a new switch today and popped it in; same thing! No illumination, but the switch functions and locks out 4th fine, and re-enables it. I did take the new switch assembly back out to check the LED, and the new one tests good. The transmission is also shifting fine. Using an OBD1 scanner, I get code 97, Overdrive Cancel Indicator Light Circuit Failure.
So I've just ordered the FSMs on CD so I can have a look a wiring and TCM pinouts, but does anyone have any input on this problem? I did look at the harness in the steering column that goes to the switch/LED assembly. No chaffing or breaks, wires test ok with multimeter. Could it be the TCM itself? Or more likely to be a wire/connection to it?
Thanks for any input!
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