Code No.35: Free-wheel engage switch system
OPERATION
The free-wheel engage switch is turned ON when the
freewheel engage solenoid valve is activated and the condition is shifted to
the 4WD condition. The power supply voltage is imposed to the free-wheel
engage switch from the transfer-ECU, and when the free-wheel engage switch is
turned ON, the power supply voltage from the transfer-ECU is grounded.
DIAGNOSIS CODE SET CONDITIONS
When the energizing condition to the
free-wheel engage solenoid valve and the condition of free-wheel engage switch
do not agree, code No.35 is set as the open circuit or the short circuit on
the free-wheel engage switch system.
PROBABLE CAUSES
- Malfunction of the free-wheel engage switch
- Damaged harness wires and connectors
- Malfunction of the transfer-ECU
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STEP 1. M.U.T.-III diagnosis code.
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Check if the diagnosis code is set.
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Q.
Is diagnosis code 34 set?
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 Refer
to diagnosis code 34: Free-wheel Engage Solenoid Valve System  .
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 Go to Step 2.
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STEP 2. M.U.T.-III data list.
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Item 38: Free-wheel engage switch (Refer to
data list reference table ).
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to
GROUP 00 - How to Cope with Intermittent Malfunction ).
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Go to Step 3.
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STEP 3. M.U.T.-III data list.
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(1)Remove the free-wheel engage switch.
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(2)Do not disconnect connector B-114.
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(3)Turn the ignition switch to the ON position.
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(4)Item 38: Free-wheel engage switch.
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(5)When the free-wheel engage switch is released
(OFF).
OK: M.U.T.-III display should be "OFF"
When the
free-wheel engage switch is pressed (ON).
OK: M.U.T.-III
display should be "ON"
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 5.
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STEP 4. Check the free-wheel engage solenoid valve.
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Refer to GROUP 26 - On-vehicle Service .
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Q.
Is the check result normal?
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Repair
or replace the actuator assembly and free-wheel engage clutch (Refer to
GROUP 26 - Differential Carrier and Free-wheel Clutch ).
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Repair
or replace the free-wheel engage solenoid valve and vacuum hoses (Refer to
GROUP 26 - Solenoid Valve and Vacuum Hose ).
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STEP 5. Check the free-wheel engage switch.
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Refer to GROUP 26 - Differential Carrier
and Free-wheel Clutch .
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Q.
Is the check result normal?
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Go to Step 6.
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Replace the free-wheel engage switch
(Refer to GROUP 26 - Differential Carrier and Free-wheel Clutch ).
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STEP 6. Measure the voltage at freewheel engage switch connector
B-114.
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(1)Disconnect the connector, and measure the voltage between
terminal No.2 and earth at the wiring harness side.
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(2)Turn the ignition switch to the ON
position.
OK: 10.5 V
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Q.
Is the check result normal?
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Go to Step 12.
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Go to Step 7.
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STEP 7. Measure the voltage at transfer-ECU connector
D-123.
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(1)Turn the ignition switch to the ON position.
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(2)Transmission gear should be neutral position.
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(3)Measure the voltage between transfer-ECU connector D-123
terminal No.50 and earth.
OK:
- When the transfer shift lever position is 2H, voltage should measure
10.5 V.
- When the transfer shift lever position is other than 2H, voltage
should measure 1 V or less.
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Q.
Is the check result normal?
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Go to Step 10.
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Go to Step 8.
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STEP 8. Connector check: B-20, D-225 intermediate connector, B-114
free-wheel engage switch connector, D-123 transfer-ECU
connector.
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Check for the contact with terminals.
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Q.
Is the check result normal?
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Go to Step 9.
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Repair
the defective connector.
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STEP 9. Check the harness between transfer-ECU connector D-123 terminal
No.50 and free-wheel engage switch connector B-114 terminal
No.2.
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Check the output line for short
circuit.
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Q.
Is the check result normal?
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Go to Step 15.
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Repair
the wiring harness.
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STEP 10. Connector check: B-20, D-225 intermediate connector, B-114
free-wheel engage switch connector, D-123 transfer-ECU
connector.
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Check for the contact with terminals.
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Q.
Is the check result normal?
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Go to Step 11.
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Repair
the defective connector.
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STEP 11. Check the harness between transfer-ECU connector D-123
terminal No.50 and free-wheel engage switch connector B-114 terminal
No.2.
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Check the output line for open
circuit.
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Q.
Is the check result normal?
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Go to Step 15.
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Repair
the wiring harness.
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STEP 12. Measure the resistance at free-wheel engage switch connector
B-114.
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Disconnect the connector, and measure the
resistance between terminal No.1 and earth at the wiring harness
side.
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OK: Continuity (2 Ω or
less)
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Q.
Is the check result normal?
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Go to Step 15.
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Go to Step 13.
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STEP 13. Connector check: B-20 intermediate connector, B-114 free-wheel
engage switch connector.
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Q.
Is the check result normal?
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Go to Step 14.
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Repair
the defective connector.
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STEP 14. Check the harness between free-wheel engage switch connector
B-114 terminal No.1 and earth.
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Check the earth line for open circuit.
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Q.
Is the check result normal?
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Go to Step 15.
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Repair
the wiring harness.
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STEP 15. M.U.T.-III data list.
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Item 38: Free-wheel engage switch (Refer to
data list reference table ).
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to
GROUP 00 - How to Cope with Intermittent Malfunction ).
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Replace the transfer-ECU.
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