Problem Symptoms Table [08/2019 - ]
WARNING: This page is about a different car, the 2024 Toyota 4Runner, 2023 Toyota 4Runner, 2022 Toyota 4Runner, 2021 Toyota 4Runner, and 2020 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
HINT:
- 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.
TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM
| Symptom | Suspected Area | Link |
|---|---|---|
| While in 2WD, even when the transfer position switch is turned to a position other than H2, the 4WD indicator light and 4LO indicator light do not illuminate | ECU power source circuit | Refer to ECU Power Source Circuit [08/2019 - ] |
| CAN communication system | Refer to 4WD Control Switch Circuit [08/2019 - ] | |
| Combination meter assembly | ||
| Transfer position switch | ||
| 4 wheel drive control ECU | ||
| While in 4WD, even when the transfer position switch is turned to a position other than H4, the 4WD indicator light remains on and the 4LO indicator light does not illuminate | ECU power source circuit | Refer to ECU Power Source Circuit [08/2019 - ] |
| Transfer position switch | Refer to 4WD Control Switch Circuit [08/2019 - ] | |
| 4 wheel drive control ECU | ||
| While in 4WD, even when the transfer position switch is turned to a position other than L4, the 4WD indicator light and 4LO indicator light remain illuminated | ECU power source circuit | Refer to ECU Power Source Circuit [08/2019 - ] |
| Transfer position switch | Refer to 4WD Control Switch Circuit [08/2019 - ] | |
| 4 wheel drive control ECU | ||
| CAN communication system | ||
| The 4WD indicator light continues blinking after the transfer position switch is operated | ECU power source circuit | Refer to ECU Power Source Circuit [08/2019 - ] |
| Transfer shift actuator assembly (transfer shift motor) | Refer to Shift Motor Circuit [08/2019 - ] | |
| A.D.D. actuator (differential vacuum actuator assembly) (A.D.D. shift motor) | ||
| Transfer shift actuator assembly (limit switch, 4WD detection switch or L4 detection switch) | ||
| A.D.D. actuator (differential vacuum actuator assembly) (limit switch or A.D.D. position switch) | ||
| 4 wheel drive control ECU | ||
| The 4LO indicator light continues blinking after the transfer position switch is operated | ECU power source circuit | Refer to ECU Power Source Circuit [08/2019 - ] |
| Transfer shift actuator assembly (transfer shift motor) | Refer to Shift Motor Circuit [08/2019 - ] | |
| Transfer shift actuator assembly (limit switch, 4WD detection switch or L4 detection switch) | ||
| 4 wheel drive control ECU |
- Blinking: Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)