Hybrid Vehicle Control ECU Communication Stop Mode [11/2022 - ]: Procedure
WARNING: This page is about a different car, the 2025 Toyota Corolla Cross, 2024 Toyota Corolla Cross, and 2023 Toyota Corolla Cross. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK FOR OPEN IN CAN BUS LINES (HYBRID VEHICLE CONTROL ECU BRANCH LINE)
- Disconnect the cable from the negative (-) auxiliary battery terminal.
- Disconnect the hybrid vehicle control ECU connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I249-51 (CA1H) - I249-52 (CA1L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω *a Front view of wire harness connector
(to Hybrid Vehicle Control ECU)Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (HYBRID VEHICLE CONTROL ECU)
Result:
OK
See step 2
- CHECK ECU POWER SOURCE CIRCUIT
- Check the ECU power source circuit.
Refer to ECU Power Source Circuit [11/2022 - ]
Result
Proceed to OK NG
Result:
OK
REPLACE HYBRID VEHICLE CONTROL ECU
Refer to REMOVAL [11/2022 - 12/2024] , or refer to REMOVAL [12/2024 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
- Check the ECU power source circuit.