Code No.C161C: ACD Proportioning Valve System (Malfunction)












caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION



DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



  • ACD proportioning valve malfunction
  • Damaged harness wires and connectors
  • Malfunction of AWC-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting ). After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the diagnosis code is reset.

Q. Is diagnosis code No.C161C set?
Go to Step 3.
This diagnosis is complete.

STEP 3. ACD proportioning valve check.
Measure the resistance of ACD proportioning valve.
Standard value: 3.7 ± 0.3 Ω

Q. Is the check result normal?
Go to Step 4.
Replace the hydraulic unit. (Refer to). Then go to Step 8.

STEP 4. AWC-ECU connector, intermediate connector, proportioning valve (for ACD) connector check: C-44, D-12, F-36

Q. Is the check result normal?
Go to Step 5.
Repair the defective connector. Then go to Step 8.

STEP 5. Check the wiring harness between C-44 AWC-ECU connector terminal No.1 and F-36 proportioning valve (for ACD) connector terminal No.3 and between F-36 proportioning valve (for ACD) connector terminal No.2 and body earth.
Check the power supply line for open or short circuit, and check the earth line for open circuit.

Q. Is the check result normal?
Go to Step 6.
Repair the wiring harness. Then go to Step 8.

STEP 6. M.U.T.-III data list.
Item 92: ACD proportional valve indicator current (Refer to data list reference table ).

Q. Is the check result normal?
Go to Step 7.
Replace the AWC-ECU. (Refer to ). Then go to Step 8.

STEP 7. Check whether the diagnosis code is reset.

Q. Is diagnosis code No.C161C set?
Replace the AWC-ECU. (Refer to ). Then go to Step 8.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 8. Check whether the diagnosis code is reset.

Q. Is diagnosis code No.C161C set?
Return to Step 1.
This diagnosis is complete.