Code No.31: Transfer shift lever switch system
![](../../../img/22/AC607007AB00ENG.png)
![](../../../img/22/AC607564AZ00ENG.png)
![](../../../img/22/AC607571AZ00ENG.png)
![](../../../img/22/AC607567AI00ENG.png)
![](../../../img/22/AC607609AH00ENG.png)
![](../../../img/22/AC607564AX00ENG.png)
![](../../../img/22/AC607571AX00ENG.png)
![](../../../img/22/AC607564AU00ENG.png)
![](../../../img/22/AC607571AU00ENG.png)
OPERATION
- System voltage is applied to the transfer shift lever switch (terminal
No.1) when the ignition switch is turned ON.
- System voltage is applied to the transfer-ECU terminal No.20, 21, 22, or
23 when the transfer shift lever is in the "2H," "4H," "4HLc" or "4LLc." The
transfer-ECU judges that the transfer shift lever is in the "2H," "4H,"
"4HLc" or "4LLc" when the system voltage is applied.
DIAGNOSIS CODE SET CONDITIONS
In the case that the input signal
from the transfer shift lever switch is open or shorted, the code No.31 is set
as the open circuit or the short circuit of the transfer shift lever switch
system.
PROBABLE CAUSES
- Malfunction of the transfer shift lever switch
- Malfunction of the ignition switch
- Damaged harness wires and connectors
- Malfunction of the transfer-ECU
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STEP 1. M.U.T.-III data list.
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Item 6: Transfer shift lever position (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 transfer shift lever 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 transfer shift lever
switch (Refer to ).
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STEP 3. Measure the voltage at transfer shift lever switch connector
D-20.
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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 6.
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Go to Step 4.
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STEP 4. Connector check: D-401 junction block connector, D-225, D-229
intermediate connector, D-20 transfer shift lever switch
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 5.
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Repair
the defective connector.
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STEP 5. Check the harness between junction block connector D-401
terminal No.12 and transfer shift lever switch connector D-20 terminal
No.1.
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Check the power supply line for short or open
circuit.
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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.
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STEP 6. Measure the voltage at transfer-ECU connector
D-124.
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(1)Disconnect transfer shift lever switch connector
D-20.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between transfer-ECU connector D-124
terminal No.20 (Transfer shift lever position: 2H) and earth.
[terminal No.21 (Transfer shift lever position: 4H), terminal No.22
(Transfer shift lever position: 4HLc), terminal No.23 (Transfer shift lever
position: 4LLc) and earth]. OK: System
voltage
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Q.
Is the check result normal?
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Go to Step 9.
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Go to Step 7.
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STEP 7. Connector check: D-124 transfer-ECU connector, D-20 transfer
shift lever switch 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 8.
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Repair
the defective connector.
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STEP 8. Check the harness between transfer-ECU connector D-124 terminal
No.20 (No.21, No.22 and No.23) and transfer shift lever switch connector
D-20 terminal No.3 (No.5, No.6 and No.2).
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Check the output line for short or open
circuit.
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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.
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STEP 9. Connector check: D-124 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 10.
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Repair
the defective connector.
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STEP 10. M.U.T.-III data list
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Item 6: Transfer shift lever position (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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