STEP 1. Using scan tool (M.U.T.-IIISE), check the data list.
STEP 2. Water/oil pump relay check.
STEP 3. Voltage measurement at water/oil pump relay.
(1) Disconnect the water/oil pump relay, and measure at the wiring harness side.
(2) Turn off to on the power supply mode of the electric motor switch.
(3) Measure the voltage between the harness side 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. (IGCT control relay and the water/oil pump relay).
STEP 5. Check the signal line for short to ground circuit (water/oil pump relay and the PHEV-ECU).
STEP 6. Check the power supply line for open circuit and short to ground circuit (water/oil pump relay and the electric water pump).
STEP 7. Check the power ground line for open circuit (electric water pump and the ground).
STEP 8. Check the signal line for open circuit or short to ground circuit (electric water pump connector and the PHEV-ECU).
STEP 9. Check the ground line for open circuit or short to ground circuit (electric water pump connector and the PHEV-ECU).
STEP 10. Test the OBD-II drive cycle.
STEP 11. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 . (2) Check the DTC.
Is the DTC set?
Retry the troubleshooting. The procedure is complete.