STEP 1. Brake electric vacuum pump check.
STEP 2. Voltage measurement at brake electric vacuum pump (terminal No 2).
(1) Measure the brake electric vacuum pump connector side by backprobing.
(2) Voltage measurement at the electric vacuum pump connector (terminal No.2) and body ground.OK: Approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 4. Go to Step 3.
STEP 3. Check the power supply line for open circuit and short to ground circuit (brake electric vacuum pump control relay 1, 2 and brake electric vacuum pump).
STEP 4. Resistance measurement at the brake electric vacuum pump connector (terminal No.1).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Resistance measurement the between the brake electric vacuum pump connector (terminal No.1) and body ground.OK: Continuity exists (2 Ω or less)
Is the check result normal?
Go to Step 6. Go to Step 5.
STEP 5. Check the ground line for open circuit (brake electric vacuum pump and body ground).
STEP 6. 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?
Replace the PHEV-ECU (Refer to ). The procedure is complete.