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SA-49
SUSPENSION AND AXLE - A.D.D. CONTROL SYSTEM
SA22N-01
INSPECTION
HINT:
First judge that the malfunction is found in A.D.D. control sys-
tem or in 2 - 4 selector system (See page TR-49 ).
1. INSPECT CLUTCH HUB AND CLUTCH SLEEVE
(a) Check the wear and damage of the clutch hub and clutch
sleeve.
If necessary, replace them.
(b) Check that clutch sleeve slides smoothly on the clutch
hub.
SA0356
2. MEASURE CLEARANCE OF SLEEVE FORK AND
CLUTCH SLEEVE
Using a feeler gauge, measure the clearance between the
sleeve fork and clutch sleeve.
Maximum clearance: 0.35 mm (0.0138 in.)
If the clearance exceeds the maximum, replace the fork or
sleeve
3. INSPECT A.D.D. ACTUATOR
SA0361 (a) Disconnect the actuator connector.
(b) Measure the resistance between the terminals 2 and 6.
Standard resistance: 0.3 - 100
(c) Measure the resistance between the terminals 2 or 6 and
body ground.
Standard resistance: More than 0.5 M
If the resistance value is not as specified, replace the actuator
assembly.
4. INSPECT A.D.D. ACTUATOR OPERATION
Actuator side:
Apply battery positive voltage between the terminal 2 or 6, and
check the actuator operation by sound, A.D.D. status and conti-
nuity between the terminal 3 and 4.
1 2 3 4 5 6 Battery voltage A.D.D.
3-4 terminals continuity
applied terminal status
2 (+) - 6 (-) Continuity Connected
2 (-) - 6 (+) No continuity Disconnected
F06635
2002 4RUNNER (RM887U)
Author : Date : 1219
SA-50
SUSPENSION AND AXLE - A.D.D. CONTROL SYSTEM
If the operation is not as specified, replace the actuator assem-
bly.
5. INSPECT A.D.D. RELAY
Relay side:
(a) Check the continuity between each terminal, as shown in
the chart.
Tester connected terminal number Specified condition
1-2 Continuity
2-4 Continuity
6-7 *
*: There is a diode between the terminals 6 and 7. If no continu-
Z15367
ity exists, check that continuity exists when changing the posi-
tion of probe for the position of negative probe of tester.
(b) Apply battery positive voltage between each terminal and
check the continuity between each terminal, as shown in
the chart.
Battery voltage Tester connected terminal
Specified condition
applied terminal number
1-3 Continuity
6 (+) - 5 (-)
1-2 No continuity
7 (+) - 2 (-) 9 - 10 No continuity
3-4 Continuity
9 (+) - 10 (-)
2-4 No continuity
If continuity is not as specified, replace the relay.
6. INSPECT TRANSFER 4WD POSITION SWITCH (See
page TR-1 1 or TR-18 )
7. REMOVE A.D.D. ACTUATOR (See page SA-30 )
8. INSPECT CLUTCH HUB AND CLUTCH SLEEVE
Check the clutch hub and clutch sleeve for wear and damage.
If necessary, replace them.
2002 4RUNNER (RM887U)
Author : Date : 1220
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