Symptoms
The TOD light flashes, the truck shudders or 4WD Auto stops working.
The fix, step by step
- Start simple.
- Edmunds owners suggest cycling into 4L and back, pulling and refitting the TOD fuse, or disconnecting the battery to reset the computer.
- Then wash the underside, because packed snow and ice can upset the sensors.
- If the light comes back, check the wiring and connectors at the front and rear driveshaft speed sensors on the transfer case, and replace a faulty sensor.
Tools & part numbers
- Multimeter
- socket set
- contact cleaner
- a pressure washer for the underside.
Where to buy the parts
Speed sensor, 1998 TrooperRockAuto ↗Amazon ↗
Transfer case fluidRockAuto ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Isuzu Trooper (second generation) parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.