Code No.C1458: Free-wheel Engage Switch System (Abnormal)
OPERATION
The free-wheel engage switch is turned ON when the free-wheel 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.C1458 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 No.C1457 set?
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 Refer to diagnosis code No.C1457: 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 77: 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 77: 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: Approx. 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)Measure the voltage between terminal No.48 and earth at the ECU side.
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(2)Transmission gear should be neutral position.
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(3)Turn the ignition switch to the ON position.
OK:
- When the transfer shift lever position is 2H, voltage should measure approx. 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.48 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.48 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 77: 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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