Code No.42: Shift actuator system (short circuit)
Code No.43: Shift actuator system (open circuit)


SHIFT ACTUATOR SYSTEM CIRCUIT


Refer to .








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



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list.
Item 10: Shift actuator current (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)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 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 10: Shift actuator current (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.