Diagnostic Aids

Inspect the wiring for poor electrical connection at the TCM. Look for possible bent, backed out, deformed or damaged terminals. Check for weak terminal tension as well. Also check for a chafed wire that could short to bare metal or other wiring.
Inspect for a broken wire inside the insulation.
When diagnosing for a possible intermittent short or open condition, move the wiring harness while observing test equipment for a change.
Check range sensor for proper mounting and adjustment.