Code No.44: Shift actuator system (overload)


SHIFT ACTUATOR SYSTEM CIRCUIT


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OPERATION


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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



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list.
Item 2, 3: Shift actuator (Refer to data list reference table ).

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Go to Step 2.

STEP 2. M.U.T.-III data list.
Item 12: Shift actuator voltage (Refer to data list reference table ).

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Go to Step 3.

STEP 3. Measure the voltage at shift actuator connector C-15.
(1)Disconnect the connector, and measure the voltage between terminal No.2 and earth at the wiring harness side.
(2)Turn the ignition switch to the ON position.
(3)Transmission gear should be neutral position.
(4)When the operating transfer shift lever 2H → 4H, 4H → 4HLc or 4HLc → 4LLc.
OK: System voltage
(5)Measure the voltage between terminal No.1 and earth at the wiring harness side.
(6)When the operating transfer shift lever 4LLc → 4HLc, 4HLc → 4H or 4H → 2H.
OK: System voltage

Q. Is the check result normal?
Replace the shift actuator (Refer to GROUP 22B - Transfer ).
Go to Step 4.

STEP 4. Measure the voltage at transfer-ECU connector D-124.
(1)Turn the ignition switch to the ON position.
(2)Transmission gear should be neutral position.
(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.
(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.

Q. Is the check result normal?
Go to Step 7.
Go to Step 5.

STEP 5. Connector check: C-15 shift actuator connector, D-124 transfer-ECU connector.
Check for the contact with terminals.

Q. Is the check result normal?
Go to Step 6.
Repair the defective connector.

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).
Check the output line for short circuit.

Q. Is the check result normal?
Go to Step 9.
Repair the wiring harness.

STEP 7. Connector check: C-15 shift actuator connector, D-124 transfer-ECU connector.
Check for the contact with terminals.

Q. Is the check result normal?
Go to Step 8.
Repair the defective connector.

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).
Check the output line for open circuit.

Q. Is the check result normal?
Go to Step 9.
Repair the wiring harness.

STEP 9. M.U.T.-III data list.
Item 12: Shift actuator voltage (Refer to data list reference table ).

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the transfer-ECU.