P0740 code

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sorry for long post , this as all data,i have on topic
but can get more, if need be.

cheers.

Hi. Here is an update. I investigated having NJ motor vehicle inspect the vehicle under a OBD II monitor exception and found that I would not receive any slack and be inspected at the full standard. I have driven extensively and found that I could trigger a p0740 very consistently in less than 2 miles if I had at least 2 start ups of the engine. I could trigger a code with never having driven over 35 miles per hour. No other codes have ever been present. This made me consider the problem to be something the system could monitor before actually achieving the speed at which the tcc would lock.

I found the ground strap to be intact but to not be conducting as my multi meter showed infinite ohms. I made and installed my own ground strap in place of the existing strap. My first test drive included 5 start ups and about 12 miles before the p0740 retuned with MIL on. I have been driving for a week since doing the ground strap and have found that the code takes more starting cycles and miles to trigger. I was intrigued that I now have the same problem but with a different quality.

I went through the same diagnostic tree in the fsm that I performed earlier in this posting and found this time at step 7 (checks tcc resistance value) that I was now open/infinite ohms instead of spec of 30-36 ohms. I found the 2 wire trans connector and verified continuity with less than 2 ohms resistance of the wire between tcc relay and the trans connector. At this point the FSM suggests dropping the trans pan. I have ordered a tcc solenoid and hopefully get the right part later this week. Once I have the part I will drop the pan for a solenoid swap and do the trans filter while there.

I will advise as things proceed.

Here in Philadelphia PA region we have had more road icing than normal and it has been tough getting around. Safe driving to all!