Code No.44: Shift actuator system (overload)
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 accumulated time to operate
the shift actuator exceeds five minutes, code No.44 is set as the overload of
the shift actuator.
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 2, 3: Shift actuator (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. M.U.T.-III data list.
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Item 12: Shift actuator voltage (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. 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 4.
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STEP 4. 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 7.
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Go to Step 5.
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STEP 5. 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 6.
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Repair
the defective connector.
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STEP 6. 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 9.
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Repair
the wiring harness.
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STEP 7. 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 8.
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Repair
the defective connector.
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STEP 8. 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 9.
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Repair
the wiring harness.
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STEP 9. M.U.T.-III data list.
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Item 12: Shift actuator voltage (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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