Code No. C202C:
Long time abnormal vacuum drop (VP)
OPERATION
The EV-ECU monitors the brake fluid pressure received from the ASC-ECU via the CAN and
the brake vacuum converted to the voltage by the brake booster vacuum sensor.
DIAGNOSIS CODE SET CONDITIONS
Although there is no brake operation, the state below
the brake vacuum warning value continues, the diagnosis code No. C202C 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.
When the air bleeding is conducted with the electric motor switch set to the ON
position, the diagnosis code may be set.
PROBABLE CAUSES
Malfunction of the vacuum line
Malfunction of the brake fluid pressure sensor
Malfunction of the brake booster vacuum sensor
Malfunction of the EV-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
Check the service data for the the ASC. (Refer to .)
Item No.15 : Master cylinder pressur
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 6.
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 - Brake Booster
Operation Check .)
Q.
Is the check result normal?
Go to Step 4.
Replace the brake booster. (Refer to GROUP 35A - On-vehicle Service - Master
Cylinder Assembly and Brake Booster Assembly Removal and Installation <LHD>, <RHD>.)
STEP 4. M.U.T.-III data list
Check the service data for the brake booster vacuum sensor. (Refer to .)
Item 250: VP: Vacuum sensor value
Q.
Is the check result normal?
Go to Step 5.
Replace the brake booster vacuum sensor. (Refer to GROUP 35A - Master
Cylinder Assembly and Brake Booster Assembly Removal and Installation <LHD>,
.<RHD>) Then go to Step 6.
STEP 5. Diagnosis code recheck
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)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Replace the EV-ECU. (Refer to .) Then go to
Step 6.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction .)
STEP 6. Diagnosis code recheck
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.
.)
Go to Step 2.
Check if any diagnosis code is set to the ASC (Refer to GROUP 35C - Troubleshooting/Diagnosis
Code Chart 