WTEC III Fault Code D1-6600

[jtcawrse]

Here is the latest.

There is continuity there between pins 5 and 45.

Battery are all independently 12.55-12.65.

Still no shifty.

The transmission is protecting itself. We just don’t know what from.

Rear glad hands were capped when the rear storage box was installed.

Any other ideas and suggestions welcome.


Sent from my iPhone using Tapatalk

 

[Skyhawk13205]

Here is the latest.

There is continuity there between pins 5 and 45.

Battery are all independently 12.55-12.65.

Still no shifty.

The transmission is protecting itself. We just don’t know what from.

Rear glad hands were capped when the rear storage box was installed.

Any other ideas and suggestions welcome.


Sent from my iPhone using Tapatalk

it seems like to me you need to find out where the comms are being lost. Allison ecu to key pad or CAT ecu to Allison ecu

You can check the serial connection from the keypad to the Allison ECU. Disconnect keypad and Allison ecu ohm out the wires from A to black S1, and B to black s17.

good luck

 

[Skyhawk13205]

it seems like to me you need to find out where the comms are being lost. Allison ecu to key pad or CAT ecu to Allison ecu

You can check the serial connection from the keypad to the Allison ECU. Disconnect keypad and Allison ecu ohm out the wires from A to black S1, and B to black s17.

good luck

i need to correct myself the serial comm is not from the keypad but to the diagnostic connector. You might have to check your termination resistors for your 1587 and your 1939 data bus

 

[Suprman]

I can connect to the wtec3 round diag plug on first gen trucks. Its a slower setting and you dont get much more info than the keypad errors. Its more than likely a wiring issue or bad tcm. I have a good tcm on hand. If you take the grill off on the drivers side of the hump the cab to trans harness comes out its a twist lock sometimes hard to get off. The bundle comes down and turns back towards the engine. Inspect the wires there. Sometimes you have to peel back the wire loom cover.

 

[jtcawrse]

From Quade this morning:

Just spent the last hour doing continuity tests on the harness. All checks out.


Sent from my iPad using Tapatalk

 

[jtcawrse]

Passing along these suggestions as I receive them. Thank you.


Sent from my iPad using Tapatalk

 

[Suprman]

Its not as much bad continuity on the harness its insulation coming off and wires shorting together, on truck metal or just damp in the harness and that can disrupt

 

[jtcawrse]

Found it. Bad fuse.

Thanks for your help!


Sent from my iPad using Tapatalk