Transaxle Prefunctional Check GMC Typhoon I

Transaxle Prefunctional Check

Before using Test Box J-38791 in functional checks, perform prefunctional check to ensure proper diagnosis and avoid replacement of good parts.

1. Check for stored codes. If codes are present, refer to code charts and repair as necessary before preforming functional check.
2. Connect Test Box J-38791 to vehicle. with ignition on, observe test box indicator lights. Battery, Ignition, Brake, Shift "A", and Shift "B" indicator lights should be on. Converter Clutch Apply and MOD indicator lights should be off. Disregard Lo Discrete 2-3 and 3-4 indicator lights.
3. If indicator lights do not function as described in previous step, check all connections. If all connections are okay and light indicators still do not function properly, check the following symptoms.