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I’m using the OBD2 scanner this may require a OBD1 I changed the sensors on the side of the trans and checked the fuseswhat type of scanner are you using, also have you already checked all fuses and grounds. many problems arise simply from ground issues. I am sure others will chime in to help soon. tell us details on your rig and all that you have done so far leading up to and when the issue began.
if you's is a true OBD2 system, you can use a test light and check for power and ground using the pinout diagram. pins 4 and 5 will be ground. pin 16 should have 12 volts at all times. since a stepvan can have anything in it for that year model, a simple way to check if you have a DS4 or DB2 pump would be to look at the accelerator pedal and injection pump. is there a mechanical cable attached to the pedal going to the pump or nothing but wires. the DB2 like Will mentioned will use a throttle cable. this style will only have a transmission controller and no engine controls.
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Here are a few pictures also has a throttle cableTake a couple of snapshots of the IP on the engine, @THEFERMANATOR will have more knowledge on this. looking at the available pins in your PCM connector, you only have one pin for data, pin 6 . as he said generic scanners won't be able to connect to this due to the pin arrangement and type of data bus.
I’m using the OBD2 scanner this may require a OBD1 I changed the sensors on the side of the trans and checked the fuses
Also the two sensors on the side of the transmission are they not the same? I’m assuming you’re talking about the wiring ?
In 1993 the input speed sensor and output speed sensor on the driver side are the same plug. IDK about newer years. These are two wire connectors. Their wiring off the transmission going into the harness bundle has insulation that fell off right at the bundle on a few pickups I have run across including a 454 powered rig. Bare copper shorts the sensor reading out. This is NOT the main transmission connector. You may also look at it for possible oil leaks at/in the main trans connector as oil is an insulator.
As mentioned the TPS looks like it was put on loose and worked itself to the end of the adjustment.