Touch Select 2/4 And High-Low System: Inspection

WARNING: This page is about a different car, the 2006 Toyota Tundra and 2005 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT 2WD <--> 4HI SHIFT
1. Turn the ignition switch to the ON position.
2. Check that the 4HI indicator lights come on when the 2WD/4HI switch is in the ON position.
3. Check that the 4HI indicator lights go off when the 2WD/4HI switch is in the OFF position.
HINT:
- If the light does not come on, even though the switch has been turned ON, the vehicle should be moved back and forth.
- If switching is not completed after 3 seconds of shift operation, the 4HI indicator light will flash.
Fig 1: Identifying 4HI Indicator Light
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT 4HI <--> 4LO SHIFT
1. Turn the ignition switch to the ON position.
2. Shift the transmission shift lever in the N position.
3. Turn the 2WD/4HI switch ON.
4. Check that the 4LO indicator lights come on and the 4HI indicator lights go off when the 4LO switch is in the ON position.
5. Check that the 4LO indicator lights go off and the 4HI indicator lights come on when pushing the 4LO switch once.
HINT:
- Inspection should be performed with the vehicle stopped, and transmission shift lever in the N position.
- If switching is not completed after 3 seconds of shift operation, the 4LO indicator light will flash.
Fig 2: Identifying 4LO Indicator Lights
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT 2WD/4HI AND 4LO SWITCH CONTINUITY

Remove the center integration panel assembly (See REMOVAL ).
Measure the resistance between the terminals as shown.

2WD/4HI switch

Standard:

2WD/4HI SWITCH RESISTANCE SPECIFICATIONS

Switch position	Tester connection	Specified condition
OFF	1-5	10 kΩ or higher
ON	1-5	Below 1 Ω

4LO switch

Standard:

4LO SWITCH RESISTANCE SPECIFICATIONS

Switch position	Tester connection	Specified condition
OFF	1-4	10 kΩ or higher
ON	1-4	Below 1 Ω

If the result is not as specified, replace the center integration panel assembly (See REMOVAL ).

Fig 3: Identifying 2WD/4HI And 4LO Switch Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT ACTUATOR RESISTANCE
1. Using an ohmmeter, measure the resistance between terminals 1 and 2.
  Standard resistance: 0.3 to 100 Ω
2. Using an ohmmeter, measure the resistance between terminals 1 or 2 and body ground.
  Standard resistance: 0.5 MΩ or higher
If the result is not as specified, replace the actuator assembly.

Fig 4: Identifying Actuator Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT ACTUATOR OPERATION
1. 2WD <--> 4HI shift: Connect lines via a relay as shown in the illustration, then check that the actuator fork shaft moves from the 2WD to 4HI position.
  
  Fig 5: Checking Actuator Fork Shaft Moves From 2WD To 4HI Position
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  When inspecting the operation described above, use a heater main relay.
  
  NOTE: Be careful not to touch the neighboring terminals or metallic parts of the relay housing when connecting.
  
  Fig 6: Inspecting Actuator Operation Using Heater Main Relay
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. 4HI <--> 2WD shift: Connect lines via a relay as shown in the illustration, then check that the actuator fork shaft moves from the 4HI to 2WD position.
  
  Fig 7: Checking Actuator Fork Shaft Moves From 4HI To 2WD Position
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. 4HI --> 4LO shift: Connect lines via a relay as shown in the illustration, then check that the actuator fork shaft moves from the 4HI to 4LO position.
  
  Fig 8: Checking Actuator Fork Shaft Moves From 4HI To 4LO Position
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. 4LO --> 4HI shift: Connect lines via a relay as shown in the illustration, then check that the actuator fork shaft moves from the 4LO to 4HI position.
Fig 9: Checking Actuator Fork Shaft Moves From 4LO To 4HI Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT LIMIT SWITCH CONTINUITY

Start the engine and raise the vehicle.
With the actuator connector connected, shift the transfer shift lever and after checking the operating sound, disconnect the connector and measure the resistance between each terminal.

HINT:

When shifting the actuator fork shaft, connect the connectors.

Fig 10: Identifying Actuator Connector Terminals

Standard:

LIMIT SWITCH RESISTANCE SPECIFICATIONS

Shift position	Tester connection	Specified condition
2WD	3-4	10 kΩ or higher
	3-5	10 kΩ or higher
	3-6	10 kΩ or higher
	4-5	Below 1 Ω
	4-6	10 kΩ or higher
	5-6	10 kΩ or higher
4HI	3-4	10 kΩ or higher
	3-5	10 kΩ or higher
	3-6	10 kΩ or higher
	4-5	10 kΩ or higher
	4-6	Below 1 Ω
	5-6	10 kΩ or higher
4LO	3-4	Below 1 Ω
	3-5	10 kΩ or higher
	3-6	10 kΩ or higher
	4-5	10 kΩ or higher
	4-6	10 kΩ or higher
	5-6	10 kΩ or higher

INSPECT VEHICLE SPEED SENSOR (See INSPECTION )
INSPECT 4HI AND 4LO INDICATOR LIGHT
Check the combination meter (See INSPECTION ).
INSPECT 4WD CONTROL ECU
Connect the wire harness side connector to the 4WD control ECU and inspect the wire harness side connector from the back, as shown.

Fig 11: Identifying 4WD Control ECU Harness Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

STANDARD VALUE OF ECU TERMINAL

Fig 12: ECU Terminal Standard Value
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002