Tech Tips
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | See page |
|---|---|---|
| Oil leakage from front differential | Oil (Level too high or wrong grade) | |
| Front differential rear oil seal (Worn or damaged) | ||
| Companion flange (Loose or damaged) | ||
| Oil leakage from rear differential | Oil (Level too high or wrong grade) | |
| Rear differential front oil seal (Worn or damaged) | ||
| Companion flange (Loose or damaged) | ||
| Oil leak from front drive pinion shaft | Oil (Level too high or wrong grade) | |
| Front differential oil seal (Worn or damaged) | ||
| Companion flange (Loose or damaged) | ||
| Oil leak from rear drive pinion shaft | Oil (Level too high or wrong grade) | |
| Rear differential oil seal (Worn or damaged) | ||
| Companion flange (Loose or damaged) | ||
| After the differential lock switch (combination switchassembly) is operated, the rear differential lock indicator light remains off or illuminated*1 After the differential lock switch is operated, the rear differential lock indicator light remains off or illuminated*2 |
ECU power source circuit | |
| Differential lock switch (combination switch assembly)*1 Differential lock switch*2 |
||
| CAN communication system | ||
| Combination meter assembly | ||
| 4 wheel drive control ECU | ||
| After the differential lock switch combination switchassembly) is operated, the rear differential lock indicator light remains blinking*1 After the differential lock switch is operated, the rear differential lock indicator light remains blinking*2 |
ECU power source circuit | |
| Differential lock shift motor | ||
| Limit switch | ||
| Differential lock indicator switch | ||
| 4 wheel drive control ECU |
*1: w/ Combination Switch
*2: w/o Combination Switch