Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Inspect wiring for poor connections at PCM . Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wires that could short to bare metal or other wiring. Check for wires broken inside their insulation. If diagnosing for intermittent short or open conditions, move wiring harness while observing scan tool for value changes.
TRANSMISSION RANGE SWITCH LOGIC (1)
| Gearshift Lever Position | Signal "A" | Signal "B" | Signal "C" | Signal "P" | ||
|---|---|---|---|---|---|---|
| Park | LOW | HI | HI | LOW | ||
| Reverse | LOW | LOW | HI | HI | ||
| Neutral | HI | LOW | HI | LOW | ||
| "OD" | HI | LOW | LOW | HI | ||
| "3" | LOW | LOW | LOW | LOW | ||
| "2" | LOW | HI | LOW | HI | ||
| "1" | HI | HI | LOW | LOW | ||
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