STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
STEP 2. Water/oil pump relay check
STEP 3. Measure the resistance in the 12V starter battery line between the 12V starter battery positive terminal and the water/oil pump relay connector.
(1) Disconnect the 12V starter battery positive terminal.
(2) Remove the water/oil pump relay.
(3) Measure the resistance between the 12V starter battery positive terminal and the relay box 3 (water/oil pump relay connector).OK: Continuity exists (2 Ω or less)
Is the check result normal?
Go to Step 4. Replace the wiring harness (12V starter battery line). Then go to Step 7.
STEP 4. Measure the resistance in the WPR- line between the PHEV-ECU connector and the water/oil pump relay connector.
(1) Disconnect the PHEV-ECU connector.
(2) Remove the water/oil pump relay.
(3) Measure the resistance between the PHEV-ECU connector (WPR- terminal) and the relay box 3 (water/oil pump relay connector).OK: Continuity exists (2 Ω or less)
Is the check result normal?
Replace the PHEV-ECU (Refer to GROUP 54Da - PHEV-ECU ). Then go to Step 7. Replace the wiring harness (WPR- line). Then go to Step 7.
STEP 5. Measure the resistance in the power supply line between the electric oil pump connector and the water/oil pump relay connector.
(1) Disconnect the electric oil pump connector.
(2) Remove the water/oil pump relay.
(3) Measure the resistance between the electric oil pump connector (power supply terminal) and the relay box 3 (water/oil pump relay connector).OK: Continuity exists (2 Ω or less)
Is the check result normal?
Go to Step 6. Replace the wiring harness (power supply line). Then go to Step 7.
STEP 6. Measure the resistance in the OPCP line between the electric oil pump connector and the power drive unit connector.
STEP 7. 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 3 . (2) Check the DTC.
Is the DTC set?
Retry the troubleshooting. The inspection is complete.