Z07256
ECU Side
−
SUSPENSION AND AXLE
DIFFERENTIAL LOCKING SYSTEM
SA
−
103
960
Author:
Date:
1996 LAND CRUISER (RM451U)
DIFF. fuse/
8 (IG)
−
Body ground
Ignition switch ON
Battery positive voltage
Rear diff. lock position switch/
2 (RLP)
−
Body ground
Ignition switch ON,
Indicator light (Rear) ON
About 0 V
Ignition switch ON,
Indicator light (Rear) OFF
Battery positive voltage
Front diff. lock position switch/
9 (FLP)
−
Body ground
Ignition switch ON,
Indicator light (front) ON.
About 0 V
Ignition switch ON,
Indicator light (front) OFF
Battery positive voltage
Center diff. indicator switch/
15 (4WD)
−
Body groud
Ignition switch ON,
Indicator light (Center diff. lock) ON
About 0 V
Ignition switch ON,
Indicator light (Center diff. lock) OFF
Battery positive voltage
Differential lock control switch/
12 (R)
−
Body ground
Ignition switch ON,
Diff. lock control switch RR or FR RR
Battery positive voltage
Ignition switch ON,
Diff. lock control switch OFF
About 0 V
Differential lock control switch/
6 (RF)
−
Body ground
Ignition switch ON,
Diff. lock control switch FR RR
Battery positive voltage
Ignition switch ON,
Diff. lock control switch OFF or RR
About 0 V
HINT:
When a signal enters the ECU to LOCK the front differential and
set the rear differential to FREE (when battery positive voltage
is inputted to terminal 6 (RF) of ECU and about 0 V is inputted
to terminal 12 (R)), or a signal to FREE both the front and rear
differentials, the indicator lights keep blinking until the ignition
switch is turned off (Fail
−
safe function).
If the circuit is not as specified, check and repair or replace the
trouble part shown in the table above.
(b)
Inspect the battery positive voltage
Battery positive voltage: 10
−
14.5 V
(c)
Inspect the system circuit with connector connected
(1)
Turn the ignition switch to the ON position.
(2)
Keep the center Diff. lock condition.
(3)
Remove the Diff. lock ECU.
(4)
Using a voltmeter, measure the voltage when the
differential lock control switch is in the position, as
shown below.
Terminals (Symbols)
Switch Position
STD Voltage (V)
15 (4WD)
−
13 (GND)
−
0.5 or less
9 (FLP)
−
13 (GND)
FR RR
0.5 or less
2 (RLP)
−
13 (GND)
RR or FR RR
0.5 or less
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Version 1.00 - 12/21/2010