Part throttle unlock (PTU) circuit, open or short detected.
Torque converter clutch solenoid CKT or Trans temp sensor too high or low
Open or short in CKT wiring or connectors. Voltage out of range at transmission temperature sensor input.
Shift indicator light failure, 5-speed
part throttle lock/unlock solenoid driver circuit (87-89)
solenoid coil circuit (85-89 Turbo I-IV)
Trans temparature sensor voltage low (1995 and
Baro-read solenoid open or shorted