DTC P163B: 4WD ECU Malfunction [08/2019 - ]: Procedure
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.
- CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU AND TRANSFER SHIFT ACTUATOR ASSEMBLY - BODY GROUND)
- Disconnect the F46 4 wheel drive control ECU connector.
- Disconnect the B62 transfer shift actuator assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition F46-8 (TM1) or B62-2 (TM1) - Body ground Always 10 kΩ or higher F46-7 (TM2) or B62-1 (TM2) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 2
- INSPECT TRANSFER SHIFT ACTUATOR ASSEMBLY (TRANSFER SHIFT MOTOR)
- Disconnect the B62 transfer shift actuator assembly connector.
- Measure the resistance according to the value(s) in the table below.
*a Component without harness connected
(Transfer Shift Actuator Assembly)Standard Resistance
Tester Connection Condition Specified Condition 2 (TM1) - 1 (TM2) Always 1.5 to 10 Ω 2 (TM1) or 1 (TM2) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY. Refer to DISASSEMBLY [08/2019 - ]
Result:
OK
See step 3
- CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU AND A.D.D. ACTUATOR (DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY) - BODY GROUND)
- Disconnect the F46 4 wheel drive control ECU connector.
- Disconnect the D1 A.D.D. actuator (differential vacuum actuator assembly) connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition F46-2 (DM1) or D1-1 (DM1) - Body ground Always 10 kΩ or higher F46-6 (DM2) or D1-2 (DM2) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 4
- INSPECT A.D.D. ACTUATOR (DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY)
- Disconnect the D1 A.D.D. actuator (differential vacuum actuator assembly) connector.
*a Component without harness connected
(A.D.D. Actuator (Differential Vacuum Actuator Assembly)) - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 1 (DM1) - 2 (DM2) Always 1.5 to 10 Ω 1 (DM1) or 2 (DM2) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
OK
REPLACE 4 WHEEL DRIVE CONTROL ECU. Refer to REMOVAL [08/2019 - ]
Result:
NG
REPLACE A.D.D. ACTUATOR (DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY). Refer to REMOVAL [08/2015 - ]
- Disconnect the D1 A.D.D. actuator (differential vacuum actuator assembly) connector.