STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
STEP 2. Brake vacuum line check.
STEP 3. Electric brake vacuum pump check.
STEP 4. Using scan tool (M.U.T.-IIISE), check the data list. <PHEV-ECU>
STEP 5. Check at the PHEV-ECU connector and the brake booster vacuum sensor connector.
STEP 6. Voltage measurement at PHEV-ECU connector (terminals VCSP, VCS1).
(1) Measure the PHEV-ECU connector side by backprobing.
(2) Measure the voltage between the PHEV-ECU connector (terminals VCSP, VCS1) and body ground.OK: 4.9 - 5.1 volts (Power supply voltage)
Is the check result normal?
Go to Step 8. Go to Step 7.
STEP 7. Check the signal line for open circuit and short to ground circuit (Brake booster vacuum sensor and PHEV-ECU).
STEP 8. Resistance measurement at the PHEV-ECU connector (terminal VCSN).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Resistance between the PHEV-ECU connector (terminal VCSN) and body ground.OK: Continuity exists (2 Ω or less)
Is the check result normal?
Go to Step 10. Go to Step 9.
STEP 9. Check the signal line for open circuit and short to ground circuit (Brake booster vacuum sensor and PHEV-ECU).
STEP 10. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Recheck the DTC.note | To check the DTC again, activate the system (the READY indicator illuminates), and then depress the brake pedal three times strongly within 120 seconds. |
(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.