JF3A TRANSFER / 4WD / AWD: TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM: INSPECTION (2008 Sequoia)

Last Modified: 11-29-2007		1.6 G
Service Category: Drivetrain	Section: Transfer/4wd/Awd
Model Year: 2008	Model: Sequoia	Doc ID: RM0000030AI002X
Title: JF3A TRANSFER / 4WD / AWD: TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM: INSPECTION (2008 Sequoia)

INSPECTION

1. INSPECT INDICATOR LIGHT

(a) 4HI Indicator Light:

(1) Turn the ignition switch to ON.

(2) Change the 4WD control switch from 2WD to 4H.

(3) Check the 4HI indicator light.

OK:

4HI indicator light comes on or 4HI indicator light comes on after blinking

HINT:

If there is a malfunction, inspect the switch, ECU, transfer shift actuator and A.D.D. actuator. 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 . Then check the combination meter .

(b) 4LO Indicator Light:

(1) Turn the ignition switch to ON.

(2) Change the 4WD control switch from 2WD to 4H. Then move the shift lever to N (vehicle is stopped) after the 4HI indicator light illuminates (after H4F switch completion).

(3) Change the 4WD control switch from 4H to 4L

(4) Check the 4LO indicator light.

OK:

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

HINT:

(1) Turn the ignition switch to ON.

(2) Change the 4WD control switch from 2WD to 4H (4HI indicator light illuminates).

(3) Press the center differential lock switch.

(4) Check the CENTER DIFF. indicator light.

OK:

CENTER DIFF. indicator light comes on or CENTER DIFF. indicator light comes on after it is blinking

HINT:

If there is a malfunction, inspect the switches, ECU, transfer, and shift actuator. 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 . Then check the combination meter .

2. INSPECT FUSE (4WD)

(a) Remove the 4WD fuse from the main body ECU.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4WD fuse	Always	Below 1 Ω

HINT:

If a fuse is blown, inspect the harness connected to the fuse for a short circuit, and repair or replace the harness and replace the fuse.

3. INSPECT 4WD 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
A29-3 (IG) - Body ground	Ignition switch ON	11 to 14 V

HINT:

If there is a malfunction, inspect the harness or connector. If the harness is malfunctioning, repair or replace harness or connector. If the harness or connector is normal, replace the 4WD control ECU .

(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

HINT:

If there is a malfunction, repair or replace the harness or connector.

4. INSPECT 4WD CONTROL ECU (4WD CONTROL SWITCH)

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A28-11 (2-4) - Body ground	Ignition switch ON 4WD control switch 2WD	Below 1.5 V
	Ignition switch ON 4WD control switch 4H	Below 1.5 V
	Ignition switch ON 4WD control switch 4L	10.5 to 14 V
A28-13 (LO) - Body ground	Ignition switch ON 4WD control switch 2WD	10.5 to 14 V
	Ignition switch ON 4WD control switch 4H	Below 1.5 V
	Ignition switch ON 4WD control switch 4L	Below 1.5 V

HINT:

If there is a malfunction, check the power supply. If the power supply is normal, inspect the 4WD control switch .

5. INSPECT 4WD CONTROL ECU (CENTER DIFFERENTIAL LOCK SWITCH)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A28-12 (DL) - Body ground

Ignition switch ON

Center differential lock switch ON

Below 1.5 V

Ignition switch ON

Center differential lock switch OFF

10.5 to 14 V

HINT:

If there is a malfunction, check the power supply. If the power supply is normal, inspect the center differential lock switch .

6. INSPECT MULTI MODE TRANSFER SHIFT ACTUATOR

HINT:

After inspecting the power supply, 4WD control switch and center differential lock switch, inspect the multi mode transfer shift actuator.

(a) Check the harness and connector (ECU - multi mode transfer shift actuator).

(1) Disconnect the D45 actuator connector.

(2) Disconnect the A28 and A29 ECU connectors.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A28-6 (TL1) - D45-4 (TL1)	Always	Below 1 Ω
A28-6 (TL1) - Body ground	Always	10 kΩ or higher
A28-7 (TL2) - D45-6 (TL2)	Always	Below 1 Ω
A28-7 (TL2) - Body ground	Always	10 kΩ or higher
A28-8 (TL3) - D45-5 (TL3)	Always	Below 1 Ω
A28-8 (TL3) - Body ground	Always	10 kΩ or higher
A28-14 (4WD) - D45-3 (CDL)	Always	Below 1 Ω
A28-14 (4WD) - Body ground	Always	10 kΩ or higher
A29-7 (TM2) - D45-2 (TM2)	Always	Below 1 Ω
A29-7 (TM2) - Body ground	Always	10 kΩ or higher
A29-8 (TM1) - D45-1 (TM1)	Always	Below 1 Ω
A29-8 (TM1) - Body ground	Always	10 kΩ or higher
D45-7 (GND) - Body ground	Always	Below 1 Ω

HINT:

If there is a malfunction, repair or replace harness or connector. If the harness or connector is normal, check the ECU output voltage.

(b) Check the 4WD control ECU (multi mode transfer shift actuator).

(1) Connect the A28 and A29 ECU connectors.

(2) Connect the D45 actuator connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A29-8 (TM1) - A29-4 (GND)	Ignition switch ON 4WD control switch 2WD → 4H or 4L (During operation of Multi mode transfer shift actuator motor from 2WD to 4WD HIGH or 4WD LOW)	10 to 14 V
A29-8 (TM1) - A29-4 (GND)	Ignition switch ON 4WD control switch 2WD → 4H or 4L (Multi mode transfer shift actuator motor stopped)	Below 1.5 V
A29-7 (TM2) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H or 4L → 2WD (During operation of Multi mode transfer shift actuator motor from 4WD HIGH or 4WD LOW to 2WD)	10 to 14 V
A29-7 (TM2) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H or 4L → 2WD (Multi mode transfer shift actuator motor stopped)	Below 1.5 V
A28-6 (TL1) - A29-4 (GND)	Ignition switch ON 4WD control switch 2WD	Below 1.5 V
A28-6 (TL1) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H or 4L	10.5 to 14 V
A28-7 (TL2) - A29-4 (GND)	Ignition switch ON 4WD control switch 2WD	10.5 to 14 V
	Ignition switch ON 4WD control switch 4H or 4L Center differential Lock	10.5 to 14 V
	Ignition switch ON 4WD control switch 4H or 4L Center differential Free	Below 1.5 V
A28-8 (TL3) - A29-4 (GND)	Ignition switch ON 4WD control switch 2WD	10.5 to 14 V
	Ignition switch ON 4WD control switch 4H or 4L Center differential Lock	Below 1.5 V
	Ignition switch ON 4WD control switch 4H or 4L Center differential Free	10.5 to 14 V
A28-14 (4WD) - A29-4 (GND)	Ignition switch ON 4WD control switch 2WD	9.5 to 14 V
	Ignition switch ON 4WD control switch 4H or 4L Center differential Lock	Below 1.5 V
	Ignition switch ON 4WD control switch 4H or 4L Center differential Free	9.5 to 14 V

HINT:

If there is a malfunction, determine if the malfunction is on the ECU side or the actuator side by disconnecting the connector of the multi mode transfer shift actuator, and then checking the ECU output voltage.

(1) Disconnect the D45 actuator connector.

(2) Connect the A28 and A29 ECU connectors.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
D45-3 (CDL) - D45-7 (GND)	Ignition switch ON	9.5 to 14 V
D45-4 (TL1) - D45-7 (GND)	Ignition switch ON	10.5 to 14 V
D45-6 (TL2) - D45-7 (GND)	Ignition switch ON	10.5 to 14 V
D45-5 (TL3) - D45-7 (GND)	Ignition switch ON	10.5 to 14 V

HINT:

If there is a malfunction, replace the 4WD control ECU . If the voltage is normal, inspect the multi mode transfer shift actuator, because the voltage applied to the motor cannot be measured.

(d) Inspect the multi mode transfer shift actuator.

(1) Remove the transfer shift actuator .

(2) Check the 2WD to 4WD HIGH (H4L) switch.

Connect lines via a relay as shown in the illustration, then check that the actuator fork moves from the 2WD to 4WD HIGH (H4L) position.

NOTICE:

Make sure to perform this inspection with the actuator removed from the vehicle. If this inspection is performed with the actuator installed to the vehicle, the actuator will be damaged.
When inspecting the actuator, make sure to operate it with the lines connected via a relay. If the lines are not connected via a relay and battery voltage is directly applied to the actuator, the actuator will be damaged.

HINT:

When inspecting the operation described above, use the stop light control relay (BRK NO. 1).

After the 2WD to 4WD HIGH (H4F) switch is complete, inspect the 4WD detection switch and limit switch.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 (CDL) - 7 (GND)	After 2WD to 4WD HIGH (H4F) switch is complete	100 kΩ or higher
4 (TL1) - 7 (GND)	After 2WD to 4WD HIGH (H4F) switch is complete	100 kΩ or higher
5 (TL3) - 7 (GND)	After 2WD to 4WD HIGH (H4F) switch is complete	100 kΩ or higher
6 (TL2) - 7 (GND)	After 2WD to 4WD HIGH (H4F) switch is complete	Below 1 Ω

(3) Check the 4WD HIGH (H4F) to 2WD switch.

Connect lines via a relay as shown in the illustration, then check that the actuator fork moves from the 4WD HIGH (H4F) to 2WD position.

After the 4WD HIGH (H4F) to 2WD switch is complete, inspect the 4WD detection switch and limit switch.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 (CDL) - 7 (GND)	After 4WD HIGH (H4F) to 2WD switch is complete	100 kΩ or higher
4 (TL1) - 7 (GND)	After 4WD HIGH (H4F) to 2WD switch is complete	Below 1 Ω
5 (TL3) - 7 (GND)	After 4WD HIGH (H4F) to 2WD switch is complete	100 kΩ or higher
6 (TL2) - 7 (GND)	After 4WD HIGH (H4F) to 2WD switch is complete	100 kΩ or higher

HINT:

If there is a malfunction, replace the transfer shift actuator . If the transfer shift actuator is normal, replace the 4WD control ECU .

7. INSPECT A.D.D. ACTUATOR

HINT:

After inspecting the multi mode transfer shift actuator, inspect the A.D.D. actuator.

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

(1) Disconnect the A28 and A29 ECU connectors.

(2) Disconnect the F1 actuator connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A28-9 (DL1) - F1-6 (DL1)	Always	Below 1 Ω
A28-9 (DL1) - Body ground	Always	100 kΩ or higher
A28-10 (DL2) - F1-5 (DL2)	Always	Below 1 Ω
A28-10 (DL2) - Body ground	Always	100 kΩ or higher
A28-15 (ADD) - F1-3 (ADD)	Always	Below 1 Ω
A28-15 (ADD) - Body ground	Always	100 kΩ or higher
A29-1 (DM1) - F1-1 (DM1)	Always	Below 1 Ω
A29-1 (DM1) - Body ground	Always	100 kΩ or higher
A29-5 (DM2) - F1-2 (DM2)	Always	Below 1 Ω
A29-5 (DM2) - Body ground	Always	100 kΩ or higher
F1-4 (GND) - Body ground	Always	Below 1 Ω

HINT:

If there is a malfunction, repair or replace harness or connector. If the harness or connector is normal, check the ECU output voltage.

(b) Check the 4WD control ECU (A.D.D. actuator).

(1) Connect the A28 and A29 ECU connectors.

(2) Connect the F1 actuator connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A29-1 (DM1) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H (During operation of A.D.D. actuator from Lock to Free)	10 to 14 V
A29-1 (DM1) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H (A.D.D. actuator Free)	Below 1.5 V
A29-5 (DM2) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H (during operation of A.D.D. actuator from Free to Lock)	10 to 14 V
A29-5 (DM2) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H (A.D.D. actuator Lock)	Below 1.5 V
A28-9 (DL1) - A29-4 (GND)	Ignition switch ON 4WD control switch 2WD (A.D.D. actuator Free)	10.5 to 14 V
A28-9 (DL1) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H (A.D.D. actuator Lock)	Below 1.5 V
A28-10 (DL2) - A29-4 (GND)	Ignition switch ON 4WD control switch 2WD (A.D.D. actuator Free)	Below 1.5 V
A28-10 (DL2) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H (A.D.D. actuator Lock)	10.5 to 14 V
A28-15 (ADD) - A29-4 (GND)	Ignition switch ON 4WD control switch 2WD	10 to 14 V
A28-15 (ADD) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H or 4L	Below 1.5 V

HINT:

If there is a malfunction, 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 A28 and A29 ECU connectors.

(2) Disconnect the F1 actuator connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F1-3 (ADD) - F1-4 (GND)	Ignition switch ON	10 to 14 V
F1-5 (DL2) - F1-4 (GND)	Ignition switch ON	10.5 to 14 V
F1-6 (DL1) - F1-4 (GND)	Ignition switch ON	10.5 to 14 V

HINT:

If there is a malfunction, replace the 4WD control ECU . 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.

(1) Remove the A.D.D. actuator .

(2) Check the Free to Lock switch.

Connect lines via a relay as shown in the illustration, then check that the actuator fork moves from the Free to the Lock position.

NOTICE:

Make sure to perform this inspection with the actuator removed from the vehicle. If this inspection is performed with the actuator installed to the vehicle, the actuator will be damaged.
When inspecting the actuator, operate it with the lines connected via a relay. If the lines are not connected via a relay and battery voltage is directly applied to the actuator, the actuator will be damaged.

HINT:

When inspecting the operation described above, use the stop light control relay (BRK NO. 1).

After the Free to Lock switch is complete, inspect the A.D.D. detection switch and limit switch.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 (ADD) - 4 (GND)	After Free to Lock switch is complete	Below 1 Ω
5 (DL2) - 4 (GND)	After Free to Lock switch is complete	100 kΩ or higher
6 (DL1) - 4 (GND)	After Free to Lock switch is complete	Below 1 Ω

(3) Check the Lock to Free switch.

Connect lines via a relay as shown in the illustration, then check that the actuator fork moves from the Lock to the Free position.

After the Lock to Free switch is complete, inspect the A.D.D. detection switch and limit switch.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 (ADD) - 4 (GND)	After Lock to Free switch is complete	100 kΩ or higher
5 (DL2) - 4 (GND)	After Lock to Free switch is complete	Below 1 Ω
6 (DL1) - 4 (GND)	After Lock to Free switch is complete	100 kΩ or higher

If there is a malfunction, replace the A.D.D. actuator . If the A.D.D. actuator is normal, replace the 4WD control ECU .

8. INSPECT HIGH-LOW TRANSFER SHIFT ACTUATOR

HINT:

Before the inspection, check that the system is switched from 2WD to 4WD normally.

(a) Check the harness and connector (ECU - high-low transfer shift actuator).

(1) Disconnect the D46 high-low transfer shift actuator connector.

(2) Disconnect the A28 and A29 ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A28-1 (HL1) - D46-4 (HL1)	Always	Below 1 Ω
A28-1 (HL1) - Body ground	Always	100 kΩ or higher
A28-2 (HL2) - D46-6 (HL2)	Always	Below 1 Ω
A28-2 (HL2) - Body ground	Always	100 kΩ or higher
A28-3 (HL3) - D46-5 (HL3)	Always	Below 1 Ω
A28-3 (HL3) - Body ground	Always	100 kΩ or higher
A28-16 (NP) - D46-3 (N)	Always	Below 1 Ω
A28-16 (NP) - Body ground	Always	100 kΩ or higher
A29-2 (HM1) - D46-1 (HM1)	Always	Below 1 Ω
A29-2 (HM1) - Body ground	Always	100 kΩ or higher
A29-6 (HM2) - D46-2 (HM2)	Always	Below 1 Ω
A29-6 (HM2) - Body ground	Always	100 kΩ or higher
D46-7 (GND) - Body ground	Always	Below 1 Ω

If there is a malfunction, repair or replace the harness or connector. If the harness or connector is normal, check the ECU output voltage.

(b) Check the 4WD control ECU (high-low transfer shift actuator).

(1) Connect the A28 and A29 ECU connectors.

(2) Connect the D46 actuator connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A29-6 (HM2) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H → 4L (During operation of high-low transfer shift actuator motor from 4WD HIGH to 4WD LOW)	10 to 14 V
A29-6 (HM2) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H → 4L (High-low transfer shift actuator motor stopped)	Below 1.5 V
A29-2 (HM1) - A29-4 (GND)	Ignition switch ON 4WD control switch 4L → 4H (During operation of high-low transfer shift actuator motor from 4WD LOW to 4WD HIGH)	10 to 14 V
A29-2 (HM1) - A29-4 (GND)	Ignition switch ON 4WD control switch 4L → 4H (High-low transfer shift actuator motor stopped)	Below 1.5 V
A28-1 (HL1) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H	Below 1.5 V
A28-1 (HL1) - A29-4 (GND)	Ignition switch ON 4WD control switch 4L	10.5 to 14 V
A28-2 (HL2) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H	10.5 to 14 V
A28-2 (HL2) - A29-4 (GND)	Ignition switch ON 4WD control switch 4L	Below 1.5 V
A28-3 (HL3) - A29-4 (GND)	Ignition switch ON 4WD control switch 4H	10.5 to 14 V
	Ignition switch ON 1.5 seconds or less after 4WD HIGH to 4WD LOW switching operation	Below 1.5 V
	Ignition switch ON Over 1.5 seconds after 4WD HIGH to 4WD LOW switching operation	10.5 to 14 V
A28-16 (NP) - A29-4 (GND)	Ignition switch ON 1.5 seconds or less after 4WD HIGH to 4WD LOW switching operation	Below 1.5 V
A28-16 (NP) - A29-4 (GND)	Ignition switch ON Over 1.5 seconds after 4WD HIGH to 4WD LOW switching operation	10 to 14 V

HINT:

If there is a malfunction, determine if the malfunction is on the ECU side or the actuator side by disconnecting the connector of the high-low transfer shift actuator, and then checking the ECU output voltage.

(1) Connect the A28 and A29 ECU connectors.

(2) Disconnect the D46 actuator connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
D46-3 (N) - D46-7 (GND)	Ignition switch ON	10 to 14 V
D46-4 (HL1) - D46-7 (GND)	Ignition switch ON	10.5 to 14 V
D46-5 (HL3) - D46-7 (GND)	Ignition switch ON	10.5 to 14 V
D46-6 (HL2) - D46-7 (GND)	Ignition switch ON	10.5 to 14 V

HINT:

If there is a malfunction, replace the 4WD control ECU . If the voltage is normal, inspect the high-low transfer shift actuator, because the voltage applied to the motor cannot be measured.

(d) Inspect the high-low transfer shift actuator.

(1) Remove the transfer shift actuator .

(2) Check the 4WD HIGH to 4WD LOW switch.

Connect lines via a relay as shown in the illustration, then check that the actuator fork moves from the 4WD HIGH to 4WD LOW position.

NOTICE:

Perform this inspection with the actuator removed from the vehicle. If this inspection is performed with the actuator installed to the vehicle, the actuator will be damaged.
When inspecting the actuator, operate it with the lines connected via a relay. If the lines are not connected via a relay and battery voltage is directly applied to the actuator, the actuator will be damaged.

HINT:

When inspecting the operation described above, use the stop light control relay (BRK NO. 1).

After the 4WD HIGH to 4WD LOW switch is complete, inspect the neutral position detection switch and limit switch.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 (N) - 7 (GND)	After 4WD HIGH to 4WD LOW switch is complete	100 kΩ or higher
4 (HL1) - 7 (GND)	After 4WD HIGH to 4WD LOW switch is complete	100 kΩ or higher
5 (HL3) - 7 (GND)	After 4WD HIGH to 4WD LOW switch is complete	100 kΩ or higher
6 (HL2) - 7 (GND)	After 4WD HIGH to 4WD LOW switch is complete	Below 1 Ω

(3) Check the 4WD LOW to 4WD HIGH switch.

Connect lines via a relay as shown in the illustration, then check that the actuator fork moves from the 4WD LOW to 4WD HIGH position.

After the 4WD LOW to 4WD HIGH switch is complete, inspect the neutral position detection switch and limit switch.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 (N) - 7 (GND)	After 4WD LOW to 4WD HIGH switch is complete	100 kΩ or higher
4 (HL1) - 7 (GND)	After 4WD LOW to 4WD HIGH switch is complete	Below 1 Ω
5 (HL3) - 7 (GND)	After 4WD LOW to 4WD HIGH switch is complete	100 kΩ or higher
6 (HL2) - 7 (GND)	After 4WD LOW to 4WD HIGH switch is complete	100 kΩ or higher

HINT:

If there is a malfunction, replace the transfer shift actuator . If the transfer shift actuator is normal, replace the 4WD control ECU .