Toyota 4Runner: Inspection

Toyota 4Runner Service Manual / Drivetrain / Vf2a Transfer / 4wd / Awd / Transfer System / Inspection

INSPECTION

PROCEDURE

1. TRANSFER SYSTEM

NOTICE:

To shift from H2 to H4, move the transfer shift lever while keeping the wheels facing straight ahead.
To shift from H4 to L4, stop the vehicle, move the shift lever to N and then move the transfer shift lever.
To shift from L4 to H4, stop the vehicle, move the shift lever to N and then move the transfer shift lever.

2. INSPECT INDICATOR LIGHT

(a) 4WD Indicator Light:

(1) Start the engine.

(2) Move the transfer shift lever from the H2 position to the H4, L4 or N position.

(3) Check that the 4WD indicator light illuminates.

OK:

4WD indicator light comes on or 4WD indicator light comes on after blinking.

If the result is not as specified, inspect the transfer indicator switch (4WD position) and four wheel drive control ECU. If the system is normal, there may be a malfunction in the CAN communication system or combination meter. In this case, first check the CAN communication system (See page ). Then check the combination meter (See page
).

(b) 4LO Indicator Light:

(1) Turn the ignition switch to ON.

(2) Move the shift lever to N (vehicle is stopped).

(3) Move the transfer shift lever from the H2, H4 or N position to the L4 position.

(4) Check the 4LO indicator light.

OK:

4LO indicator light comes on or 4LO indicator light comes on after blinking.

If the result is not as specified, inspect the transfer indicator switch (L4 position) and four wheel drive control ECU. If the system is normal, there may be a malfunction in the CAN communication system or combination meter. In this case, first check the CAN communication system (See page ). Then check the combination meter (See page
).

3. INSPECT FOUR WHEEL DRIVE CONTROL ECU (POWER SUPPLY)

(a) Measure the voltage according to the value(s) in the table below.

Standard voltage:

Tester Connection	Switch Condition	Specified Condition
F46-3 (IG) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Component with harness connected (Four Wheel Drive Control ECU)

If the result is not as specified, inspect the fuse, harness or connector. If the harness or connector is malfunctioning, repair or replace the harness or connector. If the harness or connector is normal, replace the four wheel drive control ECU (See page ).

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

Tester Connection	Condition	Specified Condition
A29-4 (GND) - Body ground	Always	Below 1 Ω

If the result is not as specified, repair or replace the harness, fuse or connector.

4. INSPECT FOUR WHEEL DRIVE CONTROL ECU (TRANSFER INDICATOR SWITCH)

(a) Measure the voltage according to the value(s) in the table below.

Standard voltage:

Tester Connection	Switch Condition	Specified Condition
F47-2 (4WDL) - Body ground	Ignition switch ON Transfer shift lever position H2 or H4	10.5 to 14 V
F47-2 (4WDL) - Body ground	Ignition switch ON Transfer shift lever position L4 or N	Below 1.5 V
F47-3 (4WD) - Body ground	Ignition switch ON Transfer shift lever position H2	10.5 to 14 V
F47-3 (4WD) - Body ground	Ignition switch ON Transfer shift lever position H4, L4 or N	Below 1.5 V
F47-16 (NP) - Body ground	Ignition switch ON Transfer shift lever position N	Below 1.5 V
F47-16 (NP) - Body ground	Ignition switch ON Transfer shift lever position not N	9.5 to 14 V

Text in Illustration

*a	Component with harness connected (Four Wheel Drive Control ECU)

If the result is not as specified, check the power supply. If the power supply is normal, inspect the transfer indicator switch (See page ).

5. CHECK HARNESS AND CONNECTOR (FOUR WHEEL DRIVE CONTROL ECU - TRANSFER INDICATOR SWITCH)

(a) Check the transfer indicator switch (4WD position).

(1) Disconnect the F47 ECU connector.

(2) Disconnect the B44 switch connector.

(3) Measure the resistance according to the value(s) in the table below.

Standard resistance:

Tester Connection	Condition	Specified Condition
F47-3 (4WD) - B44-1	Always	Below 1 Ω
F47-3 (4WD) - Body ground	Always	100 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Four Wheel Drive Control ECU)

Front view of wire harness connector

(to Transfer Indicator Switch)

If the result is not as specified, repair or replace the harness or connector.

(b) Check the transfer indicator switch (L4 position).

(1) Disconnect the F47 ECU connector.

(2) Disconnect the B45 switch connector.

(3) Measure the resistance according to the value(s) in the table below.

Standard resistance:

Tester Connection	Condition	Specified Condition
F47-2 (4WDL) - B45-1	Always	Below 1 Ω
F47-2 (4WDL) - Body ground	Always	100 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Four Wheel Drive Control ECU)

Front view of wire harness connector

(to Transfer Indicator Switch)

If the result is not as specified, repair or replace the harness or connector.

(1) Disconnect the F47 ECU connector.

(2) Disconnect the B46 switch connector.

(3) Measure the resistance according to the value(s) in the table below.

Standard resistance:

Tester Connection	Condition	Specified Condition
F47-16 (NP) - B45-1	Always	Below 1 Ω
F47-16 (NP) - Body ground	Always	100 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Four Wheel Drive Control ECU)

Front view of wire harness connector

(to Transfer Indicator Switch)

If the result is not as specified, repair or replace the harness or connector.

6. INSPECT A.D.D. ACTUATOR

(a) Check the harness and connector (ECU - A.D.D. actuator).

(1) Disconnect the F46 and F47 ECU connectors.

(2) Disconnect the D1 actuator connector.

(3) Measure the resistance according to the value(s) in the table below.

Standard resistance:

Tester Connection	Condition	Specified Condition
F47-9 (DL1) - D1-6 (DL1)	Always	Below 1 Ω
F47-9 (DL1) - Body ground	Always	100 kΩ or higher
F47-10 (DL2) - D1-5 (DL2)	Always	Below 1 Ω
F47-10 (DL2) - Body ground	Always	100 kΩ or higher
F47-15 (ADD) - D1-3 (ADD)	Always	Below 1 Ω
F47-15 (ADD) - Body ground	Always	100 kΩ or higher
F46-1 (DM1) - D1-1 (DM1)	Always	Below 1 Ω
F46-1 (DM1) - Body ground	Always	100 kΩ or higher
F46-5 (DM2) - D1-2 (DM2)	Always	Below 1 Ω
F46-5 (DM2) - Body ground	Always	100 kΩ or higher
D1-4 (GND) - Body ground	Always	Below 1 Ω

Text in Illustration

Front view of wire harness connector

(to Four Wheel Drive Control ECU)

Front view of wire harness connector

(to A.D.D. Actuator)

If the result is not as specified, repair or replace the harness or connector. If the harness or connector is normal, check the ECU output voltage.

(b) Check the four wheel drive control ECU (A.D.D. actuator).

(1) Connect the F46 and F47 ECU connectors.

(2) Connect the D1 actuator connector.

(3) Measure the voltage according to the value(s) in the table below.

Standard voltage:

Tester Connection	Switch Condition	Specified Condition
F46-1 (DM1) - F46-4 (GND)	Ignition switch ON Transfer shift lever position H2 → H4, L4 or N (During operation of A.D.D. actuator motor from FREE to LOCK)	10 to 14 V
F46-1 (DM1) - F46-4 (GND)	Ignition switch ON Transfer shift lever position H2 → H4, L4 or N (A.D.D. actuator motor stopped)	Below 1.5 V
F46-5 (DM2) - F46-4 (GND)	Ignition switch ON Transfer shift lever position H4, L4 or N → H2 (During operation of A.D.D. actuator motor from LOCK to FREE)	10 to 14 V
F46-5 (DM2) - F46-4 (GND)	Ignition switch ON Transfer shift lever position H4, L4 or N → H2 (A.D.D. actuator motor stopped)	Below 1.5 V
F47-9 (DL1) - F46-4 (GND)	Ignition switch ON Transfer shift lever position H2	Below 1.5 V
F47-9 (DL1) - F46-4 (GND)	Ignition switch ON Transfer shift lever position H4, L4 or N	10.5 to 14 V
F47-10 (DL2) - F46-4 (GND)	Ignition switch ON Transfer shift lever position H2	10.5 to 14 V
F47-10 (DL2) - F46-4 (GND)	Ignition switch ON Transfer shift lever position H4, L4 or N	Below 1.5 V
F47-15 (ADD) - F46-4 (GND)	Ignition switch ON Transfer shift lever position H2	9.5 to 14 V
F47-15 (ADD) - F46-4 (GND)	Ignition switch ON Transfer shift lever position H4, L4 or N	Below 1.5 V

Text in Illustration

*a	Component with harness connected (Four Wheel Drive Control ECU)

If the result is not as specified, determine if the malfunction is on the ECU side or the actuator side by disconnecting the connector of the A.D.D. actuator, and then checking the ECU output voltage.

(1) Connect the F46 and F47 ECU connectors.

(2) Disconnect the D1 actuator connector.

(3) Measure the voltage according to the value(s) in the table below.

Standard voltage:

Tester Connection	Switch Condition	Specified Condition
D1-3 (ADD) - D1-4 (GND)	Ignition switch ON	9.5 to 14 V
D1-5 (DL2) - D1-4 (GND)	Ignition switch ON	10.5 to 14 V
D1-6 (DL1) - D1-4 (GND)	Ignition switch ON	10.5 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to A.D.D. Actuator)

If the result is not as specified, replace the four wheel drive control ECU (See page ). If the voltage is normal,
inspect the A.D.D. actuator, because the voltage applied to the motor cannot be measured.

(d) Inspect the A.D.D. actuator (See page ).

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TERMINALS OF ECU 1. CHECK 4WD CONTROL ECU (a) Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color ...

1gr-fe Battery / Charging

...

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