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I think that the ECU, when it first powers up looks at the pressure transducer even before there's air pressure. That's why my ECU was throwing a fault whether I was using the engine compressor or shop air to supply air. With the engine compressor, it'd take a minute or two for pressure to come...

PM me. I've got my old parts

If you're not getting +120 psi, you may not get the pressure switch to close. The screw on the compressor turns counter-clockwise to increase pressure. But bypassing the pressure switch should fool the ECU into continuing, unless something else like the transducer is whacked. The pressure...

Jinx...

The pressure transducer is not a simple switch, it translates the actual air pressure to a voltage. But you can't test it without some specialized equipment - think pressure vs. voltage curves, charts, a test cell. Or the LMTV electronic test tools, if you are so lucky. This is how the CTIS...

According to Spicer's TFM: "Check for continuity between PCU connector pin A and ECU harness connector J, PCU pin B and ECU pin b (lower case), and PCU pin C and ECU pin c (lower case). Also, check for short circuits in the PCU harness pins A to B, B to C, and C to A". Later in the test you...

I still need to to take my kick panel down and read the numbers from my pressure transducer. And there's no way to test the transducer itself. Funny thing, the PCU hangs "upside down" in the LMTV, which I think causes moisture and crud to get into the transducer. My old transducer was all cruddy...

That connector you've pictured is for your PCU solenoids. Test by disconnecting the plug from the ECU. Test resistance between plug (not ECU) pins B to ground, C to ground, and R to ground, then B to C, B to R, and C to R. You should get around 60 Ohms when measuring pin to ground, and around...

WARNING - If you haven't been warned before, make sure that the truck master power switch is off when you are plugging/unplugging the ECU. Bad things can happen... I managed to find a complete PCU on <large online auction site> in the Collectibles/LMTV or FMTV. Swapped entire upper half...

Your CTIS - when does the 5-flashing start? On mine, I'd hit the master switch on, and even without pressure or the truck running, my CTIS ECU would flash HWY 1-2 times, then all 5 would start flashing. I had a bad PCU transducer. Otherwise, 5-flashing could be a bunch of stuff. The pressure...