Code No.41: Shift actuator system (short/open circuit)












OPERATION


When voltage is applied to the shift actuator terminal No.2 from the transfer-ECU, the motor turns to the normal direction and the drive mode is shifted in the order of 2H → 4H → 4HLc → 4LLc. When voltage is applied to the shift actuator terminal No.1, the motor turns to the reverse direction and the drive mode is shifted in the order of 4LLc → 4HLc → 4H → 2H.

DIAGNOSIS CODE SET CONDITIONS


In the case that the transfer-ECU terminal voltage is more than the main relay voltage (90% of specified voltage) or lower than the main relay voltage (10% of specified voltage) when the shift is not operated, code No.41 is set as the open circuit or the short circuit of the shift actuator system.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. 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 2.

STEP 2. Measure the voltage at shift actuator connector C-15.
(1)Turn the ignition switch to the ON position.
(2)Transmission gear should be neutral position.
(3)Disconnect the connector, and measure the voltage between terminal No.2 and earth at the wiring harness side.
(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 3.

STEP 3. 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 6.
Go to Step 4.

STEP 4. 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 5.
Repair the defective connector.

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).
Check the output line for short circuit.

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

STEP 6. 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 7.
Repair the defective connector.

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).
Check the output line for open circuit.

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

STEP 8. 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.