Need wiring diagram and component layout for my 1990 Dodge Caravan C/V with automatic overdrive transmission 3.0 liter engine.
Starts off in 2nd gear and stays in 2nd gear. Started out doing this intermittently plus dropping down into 2nd gear intermittently down the highway...Replaced speed sensor, checked continuity of wiring from speed sensor to ECM, checked for reference voltage, checked connections at ECM and at transmission control module. Also there are no codes.
Any help appreciated..

 

Welcome to DF

Did you check for codes in the TCM, because the PCM will not store any codes from the transmission.

 

No, I haven't. I have only done the manual code reading way, key off key on 3 times. I have an OTC airbag scanner that does OBDII, I don't think it will read transmission codes from this model. We only have an Auto Zone here, do they have a scanner that will read transmission codes for my model of van?
Thanks for any help..

 

They may not have a scanner to check for codes. You may need the dealer, if they still have the cords to check for codes.