Code No.86: Rear
Differential Lock Detection Switch Circuit Incomplete <Vehicles without Rear Differential
Lock>
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If there is any problem in
the CAN bus lines, an incorrect diagnosis code may be set. Diagnose the CAN bus lines before
the diagnosis codes (Refer to GROUP 54D, CAN bus-line diagnostic flow  ).
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As for vehicles with rear differential lock, ASTC-ECU detects the rear differential lock
operation status by the following information.
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- Rear differential lock detection switch: ON
- Rear differential lock indicator signal: illuminates or flashes
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When any of these signals becomes effective, it is judged that the rear differential lock
is activated, the ABS (EBD)/ASC/TCL control becomes prohibited, and the ASC indicator
lamp, ASC OFF indicator lamp, ABS warning lamp, and brake warning lamp are illuminated. However,
as for vehicles without rear differential lock, the terminal section that detects ON/OFF
of rear differential lock detection switch is fixed in an open status, rendering the rear differential
lock status to be OFF at all times.
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DIAGNOSIS CODE SET CONDITIONS
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The code is set when "the rear differential lock engage switch: ON" as well as "the rear
differential lock indicator signal: OFF" are received simultaneously for a specified period.
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- Damaged wiring harness or connector
- Malfunction of rear differential lock detection switch
- Malfunction of ASTC-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Before connecting or disconnecting the M.U.T.-III, turn the ignition
switch to the "LOCK" (OFF) position.
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(1)Connect M.U.T.-III to the 16-pin diagnosis connector.
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(2)Turn the ignition switch to the "ON" position.
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(3)Diagnose the CAN bus line.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is the check result normal?
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 Go to Step 3
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 Repair the CAN bus line (Refer to GROUP 54D, CAN bus line Diagnostic flow ).
Then go to Step 2.
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STEP 2. Check whether the diagnosis code is reset.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Turn the ignition switch to the "ON" position.
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(6)Drive the vehicle more than 10 seconds at the speed exceeds 10 km/h.
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(7)Check if the diagnosis code is set.
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Go to Step 3
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The procedure is complete.
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STEP 3. Check the M.U.T.-III data list.
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(1)Turn the ignition switch to the "ON" position.
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(2)Operate the rear differential lock switch, and check if the operation status matches
the service data output.
- Item No.85: Rear differential lock
OK: UNLOCK
- Item No.86: Rear differential lock engage switch
OK: OFF
- Item No.87: Rear differential lock indicator
OK: OFF
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Q.
Is the check result normal?
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Go to Step 11
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NO (Output of item No. 85 or No. 86 is unmatched) : Go to Step 4
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NO (Item No. 87 output unmatched) : Go to Step 8
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STEP 4. Connector check: D-223 ASTC-ECU connector, D-34 joint connector,
D-123 transfer-ECU connector, D-219 intermediate connector, D-228 intermediate connector and D-230
intermediate connector.
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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). Then go to Step 13.
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STEP 5. Resistance measurement at the D-34 joint connector
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(1)Disconnect the D-34 joint connector and measure the resistance at the harness side.
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(2)Measure the resistance between the D-34 joint connector terminal No.80 and body
earth.
OK: No continuity
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Q.
Is the check result normal?
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Go to Step 6
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Repair the wiring harness. Then go to Step 13.
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STEP 6. Resistance measurement at the D-34 joint connector
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(1)Disconnect the D-34 joint connector and D-123 transfer-ECU connector, and measure
the resistance at the harness side.
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(2)Measure the resistance between the D-34 joint connector terminal No.66 and body
earth.
OK: No continuity
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Q.
Is the check result normal?
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Go to Step 7
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Repair the wiring harness. Then go to Step 13.
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STEP 7. Resistance measurement at the D-34 joint connector
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(1)Disconnect the D-34 joint connector and D-223 ASTC-ECU connector, and measure the
resistance at the harness side.
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(2)Measure the resistance between the D-34 joint connector terminal No.122 and body
earth.
OK: No continuity
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Q.
Is the check result normal?
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Go to Step 8
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Repair the wiring harness. Then go to Step 13.
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STEP 8. Connector check: D-223 ASTC-ECU connector, D-124 transfer-ECU
connector and D-225 intermediate connector.
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Q.
Is the check result normal?
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Go to Step 9
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Repair or replace the damaged component(s). Then go to Step 13.
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STEP 9. Resistance measurement at the D-223 ASTC-ECU connector and
D-124 transfer-ECU connector
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(1)Disconnect the D-223 ASTC-ECU connector and D-124 transfer-ECU connector, and measure
the resistance at the harness side.
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(2)Measure the resistance between the D-223 ASTC-ECU connector terminal No.85 and
D-124 transfer-ECU connector terminal No.6.
OK: Continuity exists (2 Ω
or less)
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Q.
Is the check result normal?
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Go to Step 10
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Repair the wiring harness. Then go to Step 13.
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STEP 10. Resistance measurement at the D-223 ASTC-ECU connector
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(1)Disconnect the D-223 ASTC-ECU connector and D-124 transfer-ECU connector, and measure
the resistance at the harness side.
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(2)Measure the resistance between the D-223 ASTC-ECU connector terminal No.85 and
body earth.
OK: No continuity
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Q.
Is the check result normal?
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Go to Step 11
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Repair the wiring harness. Then go to Step 13.
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STEP 11. Transfer-ECU check.
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Refer to GROUP 27 -
Transfer-ECU Check.
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Q.
Is the check result normal?
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Go to Step 12
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Replace the transfer-ECU. Then go to Step 13.
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STEP 12. Check whether the diagnosis code is reset.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Turn the ignition switch to the "ON" position.
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(6)Drive the vehicle more than 10 seconds at the speed exceeds 10 km/h.
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(7)Check if the diagnosis code is set.
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Replace the ASTC-ECU (Refer to ). Then go to Step
13 .
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Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent
Malfunction ).
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STEP 13. Check whether the diagnosis code is reset.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Turn the ignition switch to the "ON" position.
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(6)Drive the vehicle more than 10 seconds at the speed exceeds 10 km/h.
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(7)Check if the diagnosis code is set.
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Return to Step 1.
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This diagnosis is complete.
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