Code No. C202B: Vacuum abnormal consumption (VP)


OPERATION



DIAGNOSIS CODE SET CONDITIONS



  • Although there is no brake operation, if the brake vacuum drops to the brake electric vacuum pump operation set value several times in a short period, the diagnosis code No. C202B will be set.
note
  • The slight brake operation to maintain the vehicle speed of approx. 6 km/h or less may set the diagnosis code.

PROBABLE CAUSES



  • Malfunction of the vacuum line
  • Malfunction of the brake fluid pressure sensor
  • Malfunction of the brake booster vacuum sensor

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Check the service data for the ASC. (Refer to .)

  • Item No.15 : Master cylinder pressure

Q. Is the check result normal?
Go to Step 2.
Check if any diagnosis code is set to the ASC (Refer to GROUP 35C - Troubleshooting/Diagnosis Code Chart ). Then go to Step 4.

STEP 2. Vacuum line check
Check the vacuum line. (Refer to GROUP 35A - On-vehicle Service - Brake Vacuum Line Check .)

Q. Is the check result normal?
Go to Step 4.
Check the vacuum hose installation. Then go to Step 3.

STEP 3. BRAKE BOOSTER OPERATION CHECK
Check the operation of the brake booster. (Refer to GROUP 35A - On-vehicle Service - Brake Booster Operation Check .)

Q. Is the check result normal?
Go to Step 4.
Replace the brake booster. (Refer to GROUP 35A - Master Cylinder Assembly and Brake Booster Assembly Removal and Installation <LHD>, <RHD>.)

STEP 4. Check the diagnosis code again.
Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
(3)After 120 seconds, check if the diagnosis code is set.

Q. Is the diagnosis code set?
Return to Step 1.
The diagnosis is complete.