STEP 1. Using scan tool (M.U.T.-IIISE), check the data list. <PHEV-ECU>
STEP 2. Voltage measurement at PHEV-ECU connector (terminal VCS1).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the voltage between the PHEV-ECU connector (terminal VCS1) and body ground.OK: Approximately 4.9 - 5.1 volts (Power supply voltage)
Is the check result normal?
Go to Step 4. Go to Step 3.
STEP 3. Check the signal line for open circuit and short to ground circuit (Brake booster vacuum sensor and PHEV-ECU).
STEP 4. Resistance measurement at the brake booster vacuum sensor connector (terminal No.1).
STEP 5. Check the ground line for open circuit, short to ground circuit and short to power supply circuit (Brake booster vacuum sensor and 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) Turn on the power supply mode of the electric motor switch.
(4) Check if the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to ). The procedure is complete.