02 dodge 2500 47re won’t go into over drive
11-11-2018, 08:23 AM
#16
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I asked to remove the Edge just to reduce variables- I had a case where a reader plugged into the OBD2 port generated electrical noise that led to a sporadic malfunction.
Anyways, unreliable engine speed data and the code for the crankshaft position sensor... check the wiring of the crank position sensor, and if OK replace the sensor.
I would suggest that you get a genuine Cummins sensor, some experiences with aftermarket parts weren't too brilliant...
Anyways, unreliable engine speed data and the code for the crankshaft position sensor... check the wiring of the crank position sensor, and if OK replace the sensor.
I would suggest that you get a genuine Cummins sensor, some experiences with aftermarket parts weren't too brilliant...
11-11-2018, 01:37 PM
#17
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Replaced the camshaft sensor, was told the 02’s don’t have cranksensors but it will throw the code for a crack sensor. Cam sensor was right under the vp. Rpms are still everywhere on the edge and still no od.
11-14-2018, 12:06 PM
#23
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This would be extremely interesting to test- because through this we can see if the PCM sees the driving conditions correctly or not.
Then you could temporarily install a lockup switch and an OD switch to see if your transmission does work as it should.
Then you could temporarily install a lockup switch and an OD switch to see if your transmission does work as it should.
11-15-2018, 04:14 AM
#25
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Bridge trans relay, install switch in parallel to the wire that is grounded by the PCM to achieve lockup.
You will need to look into the wiring diagram for your year to check which wire does what.
Basically the trans relay sends +12V to the solenoids for lockup and for OD, the PCM then grounds the other wire of the solenoid when it wants to actuate that solenoid.
By grounding this wire through a switch you can lockup the TC without the PCM commanding it. Same for OD- you ground it and OD is active even in first gear. (Not that you would want that)
By this test you can determine if your transmission reacts correctly to those electrical inputs.
You will need to look into the wiring diagram for your year to check which wire does what.
Basically the trans relay sends +12V to the solenoids for lockup and for OD, the PCM then grounds the other wire of the solenoid when it wants to actuate that solenoid.
By grounding this wire through a switch you can lockup the TC without the PCM commanding it. Same for OD- you ground it and OD is active even in first gear. (Not that you would want that)
By this test you can determine if your transmission reacts correctly to those electrical inputs.
11-15-2018, 05:01 AM
#26
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I had a buddy tell and to do that and he said put a jumper wire from the 3rd pin on the really to the 5th pin with is the swith on the relay. Not sure if this was the correct way but didn’t feel anything different. Also ohm tested the Pcm 21st pin and the 3rd pin for the trans relay to test the whole circuit and it read 31.6ohms
11-15-2018, 06:42 AM
#27
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Yep, bridging the relay (by putting a wire into cavities 3 and 5 in the relay socket) will "enable" the OD and the lockup solenoid.
Giving the return line (eg pin 21 on the pcm) a connection to ground will complete the circuit, energizing the solenoid and therefore activating it.
Since you now know that A: The trans relay bridged did not make a difference and B: the connections from the socket of the relay to the solenoid and back up to the PCM are good you now have 2 possibilities:
A: The PCM does not ground the pin21 (Why- sensor input, defective PCM, software corrupt...)
B: Even with the pin grounded the trans does not shift into overdrive (worn OD clutches, solenoid dirty/sticking, OD piston seal ruptured.... )
These 2 possible scenarios need different approaches to fix them. So we first need to see which one it is.
Please reference the wiring diagram of your truck to find the correct pins- I do not know the pinout and wiring colors for the 02!
Giving the return line (eg pin 21 on the pcm) a connection to ground will complete the circuit, energizing the solenoid and therefore activating it.
Since you now know that A: The trans relay bridged did not make a difference and B: the connections from the socket of the relay to the solenoid and back up to the PCM are good you now have 2 possibilities:
A: The PCM does not ground the pin21 (Why- sensor input, defective PCM, software corrupt...)
B: Even with the pin grounded the trans does not shift into overdrive (worn OD clutches, solenoid dirty/sticking, OD piston seal ruptured.... )
These 2 possible scenarios need different approaches to fix them. So we first need to see which one it is.
Please reference the wiring diagram of your truck to find the correct pins- I do not know the pinout and wiring colors for the 02!
11-15-2018, 12:03 PM
#28
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All of the OD components should be in the OD housing that will unbolt from the trans with 6 bolts right? And I assume the shop I took it to didn’t pressure test it when they said they did and then they just threw a valve body in it to see if it would fix it.
11-15-2018, 12:38 PM
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Found a color coded picture. OD switch the wire is ORG/WHT and it’s pin 13 on the far left connector on the pcm and the ground is green, pin 6 BRN on the trans solenoid assembly goes to pin 21 on the middle plug on the pcm whitch I have already tested.