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 |
|---|---|---|
| Noise | Oil (Level low) | |
| Oil (Wrong) | ||
| Transfer faulty | ||
| Oil leakage | Oil (Level too high) | |
| Gasket (Damaged) | ||
| Oil seal (Worn or damaged) | ||
| O-ring (Worn or damaged) | ||
| While in H4F, even when the transfer position switch is turned to a position other than H4F, the center differential lock indicator light and 4LO indicator light do not illuminate | ECU power source circuit | |
| CAN communication system | ||
| Combination meter assembly | ||
| Transfer position switch | ||
| 4 wheel drive control ECU | ||
| While in H4L, even when the transfer position switch is turned to a position other than H4L, the center differential lock indicator light remains on and the 4LO indicator light does not illuminate | ECU power source circuit | |
| Clutch start switch circuit (for Manual Transmission) | ||
| Transfer position switch | ||
| 4 wheel drive control ECU | ||
| While in L4L, even when the transfer position switch is turned to a position other than L4L, the center differential lock indicator light and 4LO indicator light remain illuminated | ECU power source circuit | |
| Transfer position switch | ||
| 4 wheel drive control ECU | ||
| CAN communication system | ||
| The 4LO indicator light continues blinking after the transfer position switch is operated | ECU power source circuit | |
| High-low transfer shift motor | ||
| High-low transfer limit switch | ||
| 4 wheel drive control ECU | ||
| The center differential lock indicator light continues blinking after the transfer position switch is operated | ECU power source circuit | |
| Center differential lock shift motor | ||
| Center differential lock limit switch or center differential lock detection switch | ||
| 4 wheel drive control ECU |
Blinking: Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)
| Symptom | Suspected Area | See page |
|---|---|---|
| Noise | Oil (Level low) | |
| Oil (Wrong) | ||
| Transfer faulty | ||
| Oil leakage | Oil (Level too high) | |
| Gasket (Damaged) | ||
| Oil seal (Worn or damaged) | ||
| O-ring (Worn or damaged) | ||
| The 4LO indicator light remains off after operating the transfer position switch (combination switch assembly) to L4*1 The 4LO indicator light remains off after operating the transfer position switch to L4*2 |
ECU power source circuit | |
| Clutch switch circuit*4 | ||
| CAN communication system | ||
| Combination meter assembly | ||
| Transfer position switch (combination switch assembly) *1 Transfer position switch*2 |
||
| 4 wheel drive control ECU | ||
| The 4LO indicator light remains on after operating the transfer position switch (combination switch assembly) to H4*1 The 4LO indicator light remains on after operating the transfer position switch to H4*2 |
ECU power source circuit | |
| Clutch switch circuit*4 | ||
| CAN communication system | ||
| Combination meter assembly | ||
| Transfer position switch (combination switch assembly) *1 Transfer position switch*2 |
||
| 4 wheel drive control ECU | ||
| The 4LO indicator light continues blinking after the transfer position switch (combination switch assembly) is operated*1 The 4LO indicator light continues blinking after the transfer position switch is operated*2 |
ECU power source circuit | |
| High-low transfer shift motor | ||
| High-low transfer limit switch | ||
| 4 wheel drive control ECU | ||
| After the center differential lock switch (combination switch assembly) is operated, the center differential lock indicator light remains off or illuminated*1 After the center differential lock switch (No. 2 combination switch assembly) is operated, the center differential lock indicator light remains off or illuminated*2*3 After the center differential lock switch is operated, the center differential lock indicator light remains off or illuminated*2*4 |
ECU power source circuit | |
| CAN communication system | ||
| Combination meter assembly | ||
| Center differential lock switch (combination switch assembly)*1 Center differential lock switch (No. 2 combination switch assembly)*2*3 Center differential lock switch*2*4 |
||
| 4 wheel drive control ECU | ||
| After the center differential lock switch (combination switch assembly) is operated, the center differential lock indicator light remains blinking*1 After the center differential lock switch (No. 2 combination switch assembly) is operated, the center differential lock indicator light remains blinking*2*3 After the center differential lock switch is operated, the center differential lock indicator light remains blinking*2 *4 |
ECU power source circuit | |
| Center differential lock shift motor | ||
| Center differential lock limit switch or center differential lock detection switch | ||
| 4 wheel drive control ECU |
*1: for 1GR-FE, 1KD-FTV, 1GD-FTV w/ Combination Switch
*2: for 1GR-FE, 1KD-FTV, 1GD-FTV w/o Combination Switch
*3: for Automatic Transmission
*4: for Manual Transmission
Blinking: Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)