Code
No.26: Centre Differential Lock Switch System
Code No.27: Rear
Differential Lock Switch
System
<L.H.drive vehicles>
<R.H.drive
vehicles>
OPERATION
- The ABS-ECU monitors ON/OFF of the centre differential lock
switch.
- The ABS-ECU supports the installation of rear differential lock. By
applying the
voltage from the ignition switch (IG2) to the terminal No. 33 which monitors
the rear differential
lock switch ON/OFF so that the rear differential lock switch is always
in the OFF state. <vehicles
without rear differential lock>
- The ABS-ECU supports the installation of rear differential lock. It
monitors that
the switch is in the OFF state by applying the voltage from the rear
differential lock ECU to
the terminal No. 33, and that the switch is in the ON state when the applied
voltage is stopped
by turning the rear differential lock switch to ON. <vehicles without
rear differential
lock>
DIAGNOSIS CODE SET CONDITIONS
Diagnosis codes No. 26 and 27 are
set in the following cases.
Code No.26
- When the ABS-ECU recognises the centre differential lock switch OFF and
the rear differential
lock switch ON simultaneously with the vehicle speed of 20 km/h or
more.
Code No.27
- When the ABS-ECU recognises the centre differential lock switch OFF and
the rear differential
lock switch ON simultaneously with the vehicle speed of 20 km/h or
more.
PROBABLE CAUSES
Code No.26
- Damaged wiring harness or connector
- Malfunction of the rear differential lock switch (vehicles without rear
differential
lock)
- Malfunction of the ABS-ECU
Code No.27
- Damaged wiring harness or connector
- Malfunction of the rear differential lock switch (vehicles with rear
differential
lock)
- Malfunction of the ABS-ECU
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STEP 1. Inspect the open circuit of centre differential
lock switch input line.
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Prior to the wiring harness inspection, check
ABS-ECU connector D-250, centre differential
lock switch connector C-12, and intermediate connector D-225, and repair
if necessary.
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Inspect the wiring harness between the ABS-ECU
connector D-250 terminal No. 46 and the
centre differential lock switch connector C-12 terminal No. 1.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair
or replace the damaged component(s).
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STEP 2. Voltage measurement at ABS-ECU connector D-250.
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(1)Disconnect the connector D-250.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure the voltage between terminal No.33 and
earth.
OK: Approximately 5 V
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Q.
Is the check result normal?
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YES (vehicles without rear differential lock) : Go to Step
3.
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YES (Vehicles with rear differential lock) : Go to Step
4.
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Go to Step 5.
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STEP 3. Inspect the wiring harness between the ABS-ECU connector D-250
and the junction connector D-34 (vehicles without rear differential
lock).
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Prior to the wiring harness inspection, check
ABS-ECU connector D-250, junction connector
D-34, intermediate connectors D-219, D-230 and E-120, and repair if
necessary.
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Inspect the wiring harness between the ABS-ECU
connector D-250 terminal No. 33 and the
junction connector D-34 terminal No. 74.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair
or replace the damaged component(s).
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STEP 4. Inspect the open or short circuit between the ABS-ECU connector
D-250 and the rear differential lock detection switch connector E-116
(vehicles with rear differential
lock).
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Prior to the wiring harness inspection, check
ABS-ECU connector D-220, junction connector
D-14, intermediate connectors D-211, D-222 and E-116, and repair if
necessary.
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Inspect the wiring harness between the ABS-ECU
connector D-250 terminal No. 33 and the
rear differential lock detection switch connector E-116 terminal No.
1.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair
or replace the damaged component(s).
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STEP 5. Check whether the diagnosis code is reset.
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(2)Move the transfer lever to the 4HLc or 4LLc
position.
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(3)Check if the diagnosis code is set.
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Q.
Is code No.26 or 27 set?
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Replace the ABS-ECU. Then go to
Step 6.
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The
procedure is complete.
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STEP 6. Check whether the diagnosis code is reset.
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(2)Move the transfer lever to the 4HLc or 4LLc
position.
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(3)Check if the diagnosis code is set.
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Q.
Is code No.26 or 27 set?
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It can
be assumed that this malfunction is intermittent. Refer to GROUP 00, How
to Use Troubleshooting/Inspection Service Points - How to Cope
with Intermittent
Malfunction  .
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The
procedure is complete.
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