![]() The PCM is getting no info from the module, but cannot determine if the module isn't sending, or if the PCM isn't recognizing and processing it. ![]() I have been attempting to use a diagram from the same year 3500 Van with the 8.1, but am struggling with which "orange/Black, cir. I am trying to check the Data lines from the TAC to the PCM, but cannot verify which ones at the PCM are the proper wires. ![]() Nothing seems to help, but we can return the pedal and t-body. Replace the throttle pedal, no change, tried a new t-body, nope, then the TAC module itself. Without a wiring diagram its tough to diag, so did the next best thing.throw parts at it. They flew back to Wisconson, and left the rig with us. It was late on a Friday, and I really have no info on that chassis, so they were going to try a local RV dealer, but got little response. I scanned for codes, and got the dreaded P1518. The tech there cleaned the T-body, and it seemed good, until they got back on the interstate, where they limped it to our shop. They made it to our sister shop in Gainesville, Florida, and the rig went into " reduced power" mode, with no throttle response. The owners were heading home to Wisconson in this rig they had purchased at a small "Mom and Pop" car lot in Ocala, Florida. I am working on a 2002 Workhorse W22, 8.1.
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