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