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E40D issues,code 67 and 97 any help appreciated!

2838 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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> The batteries have a good charge though, could a low voltage on the alternator cause this?

What is the voltage across the + and - terminals of the battery before you turn the ignition on?

It is easy to determine if the alternator is your problem. When the engine is running it should be applying a charging voltage to the batteries. 1) check the battery voltage before turning stuff on. 2) start the engine. 3) a high idle is good, now check the voltage across the battery terminals again. It should rise from about 12.6v before you start the engine, to 13+ volts after. If the voltage doesn't rise that far after a few minutes then you need to figger out what is not working.
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