Diagnostic Aids
Code will set if PCM detects one of 2 illegal combinations. Check all connections for good contact. An intermittent may be caused by a poor connection, chaffed wire insulation or a broken wire. Monitor voltage of each terminal while moving related harness connectors. If failure is induced, voltage reading will change.
VALID PSM COMBINATION (4L60-E)
| Gear | A | B | C |
|---|---|---|---|
| Park | Off | On | Off |
| Reverse | On | On | Off |
| Neutral | Off | On | Off |
| 4th | Off | On | On |
| 3rd | Off | Off | On |
| 2nd | Off | Off | Off |
| 1st | On | Off | Off |
| Illegal | On | Off | On |
| Illegal | On | On | On |