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DTC C202A: Pump motor drive long time (VP)
DTC C202B: Vacuum PRS.abnormal loss (VP)
DTC C202C: Pressure long time low (VP)
 
 
cautionWhenever ECU is replaced, ensure that the CAN bus lines are normal.
noteWhen the DTC is set under the following conditions, it does indicate a malfunction. Erase the DTC and then complete the check.
  • DTCs C202A, C202B, C202C: Bleeding is carried out with the system activated [READY (ready to drive) illuminates and the power supply mode of the electric motor switch is at ACC].
  • DTC C202B: The brake pedal is depressed gently to maintain a vehicle speed of approximately 6 km/h (3.7 mph) or less.
 
 
DTC SET CONDITIONS
The PHEV-ECU sets the DTCs below when the brake vacuum pressure system fails.
DTC C202A
  • The brake electric vacuum pump motor is energized for a certain period or more with the brake pedal not depressed.
DTC C202B
  • The brake vacuum decreases by a certain amount with the brake pedal not depressed.
DTC C202C
  • The brake vacuum decreases for a certain period (this DTC is set when the vacuum warning tone alarm sounds for a certain period).
 
 
 
PROBABLE CAUSES
  • Malfunction of vacuum line.
  • Malfunction of the check valve.
  • Malfunction of the brake booster.
  • Malfunction of the brake electric vacuum pump.
  • Malfunction of the brake electric vacuum pump relay box.
  • Malfunction of the brake booster vacuum sensor.
 
 

 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Check whether another DTC, which is related to the brake vacuum generating system, is set (Refer to ).
Is the DTC set?
Troubleshoot for the relevant DTC.
Go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-IIISE), check the data list. <ASC-ECU>
Check that the following data list display contents are normal (Refer to GROUP 35C - Diagnosis, Data List Reference Table ).
Data list
  • Item No.10: Master cylinder pressure (+: pressure increase, -: pressure decrease)
 
Check conditionNormal condition
The brake pedal is depressed.Increases by the amount of the brake pedal depression.
The brake pedal is released.-3 to 3 bar
  • Item No.91: Brake pressure sensor
 
Check conditionNormal condition
The brake pedal is depressed.ON
The brake pedal is released.OFF
Is the check result normal?
Go to Step 5.
Go to Step 3.
 
STEP 3. Brake vacuum line check.
Refer to GROUP 35A - On-vehicle Service, Brake Vacuum Line Check .
Is the check result normal?
Go to Step 4.
Repair it.
 
STEP 4. Electric brake vacuum pump check.
Refer to GROUP 35A - On-vehicle Service, Brake Electric Vacuum Pump Check .
Is the check result normal?
Go to Step 5.
Replace the brake electric vacuum pump (Refer to GROUP 35A - Brake Electric Vacuum Pump ).
 
STEP 5. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Recheck the DTC.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Depress the brake pedal, and turn on the power supply mode of the electric motor switch (READY operation).
(4) Check the DTC.
Is the DTC set?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
The procedure is complete.