Inspection Procedure 17: 4LLc detection switch system
OPERATION
- System voltage is applied to the 4LLc detection switch output terminal
(terminal No.1) from the ECU via the resistance in the unit.
- The 4LLc detection switch is grounded through the transfer case to the
vehicle body.
COMMENTS ON TROUBLE SYMPTOM
The cause is probably a malfunction of
the 4LLc detection switch or ECU.
PROBABLE
CAUSES
- Malfunction of the 4LLc detection switch
- Damaged harness wires and connectors
- Malfunction of the A/T-ECU <4M4>
- Malfunction of the engine-A/T-ECU <6G7>
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STEP 1. M.U.T.-III data list
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Item 31: 4LLc detection 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 2.
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STEP 2. Check the 4LLc detection switch.
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Refer to .
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Q.
Is the check result normal?
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Go to Step 3.
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Replace the 4LLc detection
switch.
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STEP 3. Measure the voltage at 4LLc detection switch connector
C-09.
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(1)Disconnect the connector, and measure the voltage between
terminal No.1 and earth at the wiring harness side.
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(2)Turn the ignition switch to the ON
position.
OK: System voltage
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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. M.U.T.-III data list
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Item 31: 4LLc detection 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 A/T-ECU <4M4>
or engine-A/T-ECU <6G7>.
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STEP 5. Measure the voltage at A/T-ECU connector D-37 <4M4>
or engine-A/T-ECU connector D-214 <6G7>.
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(1)Disconnect 4LLc detection switch connector C-09.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between A/T-ECU connector D-37
terminal No.9 <4M4> and earth or engine-A/T-ECU connector D-214
terminal No.55 <6G7> and earth.
OK: System
voltage
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 8.
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STEP 6. Connector check: C-09 4LLc detection switch connector, D-225
intermediate connector, D-37 A/T-ECU connector <4M4> or D-214
engine-A/T-ECU connector <6G7>
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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 7.
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Repair
the defective connector.
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STEP 7. Check the harness between 4LLc detection switch connector C-09
terminal No.1 and A/T-ECU connector D-37 terminal No.9 <4M4>
or engine-A/T-ECU connector D-214 terminal No.55
<6G7>.
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Check the power supply line for open
circuit.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair
the wiring harness.
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STEP 8. Connector check: C-09 4LLc detection switch connector, D-225
intermediate connector, D-37 A/T-ECU connector <4M4> or D-214
engine-A/T-ECU connector <6G7>
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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 4LLc detection switch connector C-09
terminal No.1 and A/T-ECU connector D-37 terminal No.9 <4M4>
or engine-A/T-ECU connector D-214 terminal No.55
<6G7>.
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Check the power supply line for short
circuit.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair
the wiring harness.
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