Code No.42: Shift actuator system (short circuit)
Code No.43: Shift
actuator system (open circuit)
SHIFT ACTUATOR SYSTEM CIRCUIT
Refer to
.
![](../../../img/22/AC607557AE00ENG.png)
![](../../../img/22/AC607559AG00ENG.png)
![](../../../img/22/AC607564AU00ENG.png)
![](../../../img/22/AC607571AU00ENG.png)
OPERATION
Refer to
.
DIAGNOSIS CODE SET CONDITIONS
When the shift actuator current is
more than the target value +1 ampere during drive, the code No.42 is set
as the short circuit of the shift actuator system.
When the main relay
voltage is 6 V or less or the actual value of the shift actuator current is
less than 0.1 A, the code No.43 is set as the open circuit of the shift
actuator system.
PROBABLE CAUSES
- Malfunction of the shift actuator
- 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 10: Shift actuator current (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. Measure the voltage at shift actuator connector
C-15.
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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.
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(3)Transmission gear should be neutral position.
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(4)When the operating transfer shift lever 2H → 4H, 4H
→ 4HLc or 4HLc → 4LLc. OK: System
voltage
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(5)Measure the voltage between terminal No.1 and earth at the
wiring harness side.
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(6)When the operating transfer shift lever 4LLc → 4HLc,
4HLc → 4H or 4H → 2H. OK: System
voltage
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Q.
Is the check result normal?
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Replace the shift actuator (Refer to
GROUP 22B - Transfer ).
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Go to Step 3.
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STEP 3. Measure the voltage at transfer-ECU connector
D-124.
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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-124
terminal No.1 and earth. OK:
- When the operating transfer shift lever 2H → 4H, 4H → 4HLc
or 4HLc → 4LLc, the voltage should measure 1/2 system voltage
→ system voltage → 1 V or less → 1/2 system
voltage.
- When the operating transfer shift lever 4LLc → 4HLc, 4HLc
→ 4H or 4H → 2H, the voltage should measure 1/2 system
voltage → 1 V or less → 1/2 system voltage.
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(4)Measure the voltage between transfer-ECU connector D-124
terminal No.3 and earth. OK:
- When the operating transfer shift lever 2H → 4H, 4H → 4HLc
or 4HLc → 4LLc, the voltage should measure 1/2 system voltage
→ 1 V or less → 1/2 system voltage.
- When the operating transfer shift lever 4LLc → 4HLc, 4HLc
→ 4H or 4H → 2H, the voltage should measure 1/2 system
voltage → system voltage → 1 V or less → 1/2 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: C-15 shift actuator connector, 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 5.
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Repair
the defective connector.
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STEP 5. Check the harness between shift actuator connector C-15
(terminal No.2, No.1) and transfer-ECU connector D-124 (terminal No.1,
No.3).
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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 8.
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Repair
the wiring harness.
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STEP 6. Connector check: C-15 shift actuator connector, 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 7.
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Repair
the defective connector.
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STEP 7. Check the harness between shift actuator connector C-15
(terminal No.2, No.1) and transfer-ECU connector D-124 (terminal No.1,
No.3).
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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 8.
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Repair
the wiring harness.
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STEP 8. M.U.T.-III data list.
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Item 10: Shift actuator current (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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