Diagnostic Aids
DTC 28 will set if PCM/TCM detects one of 2 "illegal" PSM assembly combinations. See PSM COMBINATION CHART for range combinations. Check all wiring connectors for proper terminal tension and location.
PSM COMBINATION
| Gear Shift Position | (1) Range Signal Circuit(s) | ||
|---|---|---|---|
| Park | "A" & "C" | ||
| Reverse | "C" | ||
| Neutral | "A" & "C" | ||
| 4th | "A" | ||
| 3rd | "A" & "B" | ||
| 2nd | "A", "B" & "C" | ||
| 1st | "B" & "C" | ||
| Illegal | "B" | ||
| Illegal | None | ||
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