Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota 4Runner 1996-2003 Approved SIL techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 024runne sa dlsy insp
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SA-1 18
SUSPENSION AND AXLE - DIFFERENTIAL LOCKING SYSTEM
SA06P-03
INSPECTION
1. INSPECT DIFFERENTIAL LOCK SYSTEM
(a) Inspect the indicator light.
Check that the indicator light lights up for approx. 1 se-
cond when the ignition switch is turned ON.
(b) Inspect the differential lock operation.
(1) Jack up the vehicle then start the engine.
(2) Shift the transfer shift lever to the 4WD position.
W01786
(3) When the Diff. lock control switch is set to the ON
position, the indicator light is turned on.
Differential lock is applied to the rear wheel at this
time.
HINT:
If the gears of the differential lock system are not meshed, the
indicator light remains blinking, so rotate the tires to mesh the
gear.
(4) When the Diff. lock control switch is at the OFF posi-
tion, the indicator light goes off.
Differential lock is released for the rear wheel at this
time.
(5) Check the voltage between the terminals of the
4WD control ECU when switching the Diff. lock con-
M1 M2
trol switch with the speedometer, registering
approx. 8 km/h (5 mph) or more.
Swith position Terminal Specified value
0.5 V or less
ON M1 - M2
(No change)
(6) Check that the indicator lights blink when 2WD
Z16659
mode is set.
Diff. lock is released for both the rear wheels at this
time.
(7) Return the Diff. lock control switch to OFF.
(8) Stop the engine and lower the vehicle.
2. INSPECT DIFF. LOCK SYSTEM CIRCUIT
(a) Inspect the battery positive voltage.
Battery positive voltage: 10 - 14 V
2002 4RUNNER (RM887U)
Author : Date : 1288
SA-1 19
SUSPENSION AND AXLE - DIFFERENTIAL LOCKING SYSTEM
(b) Inspect the system circuit with the connector discon-
RLP M2 M1 R nected.
Disconnect the connector from the 4WD control ECU and
inspect the connector on the wire harness side, as shown
in the chart.
IG GND L4 SPD
Z16462
Symbols (Terminals No.) Trouble part Condition Specified value
RR Differntial Lock Ac-
M1 - M2 - Less than 100
tuator
GND - Body ground Body ground - Continuity
1 pulse each
SPD - Body ground Speed sensor Vehicle moves slowly
40 cm (15.75 in.)
IG - Body ground DIFF Fuse Ignition switch ON 10 - 14 V
Rear Differential Lock Ignition switch ON with indicator light ON About 0 V
RLP - B d ground
Body d
Indicator Switch Ignition switch ON with indicator light OFF 10 - 14 V
Ignition switch ON with indicator light OFF About 0 V
L4 - Body ground
B d d L4 I di t S it h
Indicator Switch
Ignition switch ON with indicator light OFF 10 - 14 V
Differential Lock Con-
Con Ignition switch ON with differential lock control switch ON 10 - 14 V
R - Body ground
B d d
trol Switch Ignition switch ON with differential lock control switch OFF About 0 V
HINT:
If the circuit is not as specified, check and repair or replace the
trouble part shown in the table above.
(c) Inspect the system circuit with the connector connected.
(1) Turn the ignition switch to the ON position.
(2) Keep the center Diff. lock condition.
(3) Remove the Diff. lock ECU.
2002 4RUNNER (RM887U)
Author : Date : 1289
SA-120
SUSPENSION AND AXLE - DIFFERENTIAL LOCKING SYSTEM
(4) Using a voltmeter, measure the voltage when the
M1 M2 RLP differential lock control switch is in the position, as
shown below.
Tester Connection
Switch position Specified valve
-
L4 - GND - 0.5 V or less
RLP - GND ON 0.5 V or less 10 - 14 V
L4 GND M1 - M2 OFF - ON (Approx. 1 sec.) 0.5 V
(A rox.
Z16461 or less
M2 - M1 ON - OFF
If the circuit is not as specified, replace the ECU.
(5) Install the ECU in place.
Heater Main Relay 3. INSPECT DIFF. LOCK COMPONENTS
Relay Housing (a) Inspect the relay operation.
2 Metallic Parts
(1) Jack up the vehicle.
3 (2) Use a heater main relay and connect it, as shown
1
below.
5 4 NOTICE:
Connect the terminals being careful not to touch the neigh-
boring terminals or metallic parts of the relay housing.
W02075 (3) Rotate the tire and check that differential lock has
occurred.
If operation is not as specified, replace the actuator.
Free Lock Lock Free
2 2
4 5 4 5
1 3 1 3
Heater Main Heater Main
3 2 3 2
6 4
Relay 5 4 Relay
Battery Battery
Z07257
2002 4RUNNER (RM887U)
Author : Date : 1290
SA-121
SUSPENSION AND AXLE - DIFFERENTIAL LOCKING SYSTEM
(b) Inspect the Diff. lock control switch continuity.
Inspect the switch continuity between terminal 1 to termi-
nal 4.
1 HINT:
If it is not continuity, replace the switch.
4
R15936
(c) Inspect the Diff. lock indicator switch.
(1) Check that there is continuity between terminals
when the switch is pushed (differential connected
position).
(2) Check that there is no continuity when the switch is
free (differential disconnected position).
HINT:
If operation is not as specified, replace the switch.
Z04174 (d) Inspect the transfer 4WD switch (See page TR-1 1).
(e) Inspect the vehicle speed sensor (See page BE-45 ).
2002 4RUNNER (RM887U)
Author : Date : 1291
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