Automatic Disconnecting Differential Control System: Inspection

INSPECT A.D.D. ACTUATOR
1. Disconnect the actuator connector.
2. Measure the resistance between the terminals 2 and 6.
  
  Fig 1: Identifying Actuator Connector Terminals (Actuator Side)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Standard resistance: 0.3 - 100 Ω
3. Measure the resistance between the terminals 2 or 6 and body ground.
  1. Standard resistance: More than 0.5 MΩ
If the resistance value is not as specified, replace the actuator assembly.

INSPECT A.D.D. ACTUATOR OPERATION

Apply battery positive voltage between the terminal 2 or 6, and check the actuator operation by sound, A.D.D. status and continuity between the terminal 3 and 4.

TERMINALS CONTINUITY

Battery Voltage Applied Terminal	3-4 Terminals Continuity	A.D.D. Status
2 (+) - 6 (-)	Continuity	Connected
2 (-) - 6 (+)	No Continuity	Disconnected

If the operation is not as specified, replace the actuator assembly.

INSPECT LIMIT SWITCH CONTINUITY

Connect the actuator connector.
Shift the transfer shift lever or switch the transfer operation switch to "H2" position.

Fig 2: Identifying Limit Switch (Lever And Switch Type)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check the A.D.D. actuator operation by sound.
Disconnect the actuator connector.

Check the continuity between each terminal, as shown in TERMINALS CONTINUITY .

TERMINALS CONTINUITY

Tester Connected Terminal Number	Specified Condition
1 - 3	No Continuity
1 - 4	No Continuity
3 - 5	Continuity
4 - 5	No Continuity

Connect the actuator connector.
Shift the transfer shift lever or switch the transfer operation switch to "H4" position.

Fig 3: Shifting Transfer Shift Lever Or Switch Transfer Operation Switch To " H4 " Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check the A.D.D. actuator operation by sound.
Disconnect the actuator connector.

Check the continuity between each terminal, as shown in TERMINAL CONTINUITY .

TERMINAL CONTINUITY

Tester Connected Terminal Number	Specified Condition
1 - 3	Continuity
1 - 4	No Continuity
3 - 5	No Continuity
4 - 5	No Continuity

Connect the actuator connector.

INSPECT A.D.D. RELAY

Fig 4: Inspecting A.D.D. Relay Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the continuity between each terminal, as shown in TERMINAL CONTINUITY .

TERMINAL CONTINUITY

Tester Connected Terminal Number

Specified Condition

1 - 2

Continuity

2 - 4

Continuity

6 - 7

⁽¹⁾

⁽¹⁾	There is a diode between the terminals 6 and 7. If no continuity exists, check that continuity exists when changing the position of (+) probe for the position of negative (-) probe of tester.

Apply battery positive voltage between each terminal and check the continuity between each terminal, as shown in TERMINAL CONTINUITY .

TERMINAL CONTINUITY

Battery Voltage Applied Terminal	Tester Connected Terminal Number	Specified Condition
6 (+) - 5 (-)	1 - 3 1 - 2	Continuity No Continuity
7 (+) - 2 (-)	9 - 10	No Continuity
9 (+) - 10 (-)	3 - 4 2 - 4	Continuity No Continuity

If continuity is not as specified, replace the relay.

INSPECT TRANSFER 4WD POSITION SWITCH
1. VF2A: See TRANSFER (VF2A)
2. VF2BM: See TRANSFER - VF2BM
REMOVE A.D.D. ACTUATOR (See step 5 of DISASSEMBLY )
INSPECT CLUTCH HUB AND CLUTCH SLEEVE
1. Check the clutch hub and clutch sleeve for wear and damage.
  If necessary, replace them.
2. Check that clutch sleeve slides smoothly on the clutch hub.
  
  Fig 5: Checking That Clutch Sleeve Slides Smoothly On Clutch Hub
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
MEASURE SLEEVE FORK AND CLUTCH SLEEVE CLEARANCE
Using a feeler gauge, measure the clearance between the sleeve fork and clutch sleeve.

Fig 6: Measuring Clearance Between Sleeve Fork And Clutch Sleeve Using Feeler Gauge
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Maximum clearance: 0.35 mm (0.0138 in.)
If the clearance exceeds the maximum, replace the fork or sleeve.