Diagnostic Aids

Refer to the accompanying chart for the normal range signals and the illegal combinations.
Inspect the wiring for poor electrical connections at the PCM and at the transmission 8-way connector. 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.
Refer to RANGE SWITCH LOGIC TABLE for further information.