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E40D issues,code 67 and 97 any help appreciated!

2842 Views 6 Replies 4 Participants Last post by  gab16
Hi guys, I have a 1990 E350 short bus with the 7.3 idi and a e40d transmission. When I fire her up and start to go the transmission feels like it's in 3rd or 4th gear when in drive and won't kick down no matter how far I press the pedal. It will manually shift to reverse and 2nd but won't go all the way down to 1st. Also, the "od off" overdrive lockout button will not illuminate when I press it. Then, the trans warms up after a little bit of driving and the "od off" light gets stuck on and it starts shifting fine and although the light is on, the 4th gear (overdrive) works properly. I have some torque converter slippage I believe as well, but trans shifts well when working right. I pulled the codes and I got a code 67 and a 97. I understand the code 67 being the MLPS but it doesn't start in other gears and my backup beep works in reverse. The code 97 is an odd one I have not seen anything in the forums about, E4OD OD cancel light circuit failure. I guess my question would be has anyone experienced similar symptoms or had a code 97 before? Also, where does the wiring from my "OD off" button go to? Would a faulty "OD off" button circuit cause the intermittent shifting problems? Thanks in advance! Fred
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I haven't gotten the chance to test it when it isn't working, it's definitely intermittent and random when it wants to work or not. So a relay could definitely be the culprit. I have read about the infamous 2nd 4th and reverse only from the trans computer not getting power or malfunctioning. Is this considered "limp mode" or does it just operate like this since 1st and 3rd are electronically controlled? Thanks!
Hi guys, thanks for the help. I switched the teca relay and it is still having the same issue where it starts with the OD light off and unresponsive. It only allows 2nd, 4th and reverse. I understand that this is a symptom of no power to the teca (transmission computer). It warms up and works fine though. I haven't been able to run the transmission code check when it is acting up yet, but will check it when it malfunctions again and see if it has any power. I am pretty sure I replaced the right relay. It was a large square 4 pin that mounted in a little black box on the fender right next to the eec test plug. Assuming I replaced the proper one, do you have any suggestions on what would make the teca computer cut on and off? It usually happens right when I start her up, and it doesn't have to drive to start working right, it can sit there idling and it will eventually work. Also, my headlights are pretty dim, interior lights seem OK but I am wondering if my alternator is going, it sat for years before I got it. The batteries have a good charge though, could a low voltage on the alternator cause this? Thanks again for any help!
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