STEP 1. Brake electric vacuum pump main relay check.
STEP 2. Voltage measurement at brake electric vacuum pump main relay connector (terminal No.5).
(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.5) 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 (fusible link and brake electric vacuum pump main relay).
STEP 4. Voltage measurement at brake electric vacuum pump control relay 1 and 2 connector (terminal No.5).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn on the power supply mode of the electric motor switch.
(3) Check the harness wires and connectors between the terminal and body ground as shown below.- Measure the voltage between the brake electric vacuum pump control relay 1 connector (terminal No.5) and body ground.
- Measure the voltage between the brake electric vacuum pump control relay 2 connector (terminal No.5) and body ground.
OK: Approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 6. Go to Step 5.
STEP 5. Check the power supply line for open circuit and short to ground (electric vacuum pump main relay and electric vacuum pump control relay 1 or 2).
STEP 6. Voltage measurement at PHEV-ECU connector (terminal VPM1).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn on the power supply mode of the electric motor switch.
(3) Measure the voltage between the PHEV-ECU connector (terminal VPM1) and body ground.OK: Approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 8. Go to Step 7.
STEP 7. Check the power supply line for open circuit and short to ground (Electric vacuum pump main relay and PHEV-ECU).
STEP 8. 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.