Toyota 4Runner: Inspection

INSPECTION

PROCEDURE

1. TRANSFER SYSTEM

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:

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 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 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 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:

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:

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

(c) Check the transfer indicator switch (neutral position).

(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:

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:

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 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 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 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 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 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.

(c) Check the four wheel drive control ECU.

(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 ).