Caution / Notice / Hint
WARNING: This page is about a different car, the 2022 Toyota Corolla, 2021 Toyota Corolla, 2020 Toyota Corolla, and 2019 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
When one of the following DTCs is output and the MIL is illuminated, actuator position learning is performed during the next trip. After the system returns to normal, actuator position learning is performed during the next trip and the MIL remains illuminated until learning is complete.
| Actuator position learning is performed when these DTCs are output. |
|---|
| P1049, P104A, P1055, P2646, P2647, P2648, P2649, P264A, U011B |
HINT:
- Do not disconnect the cable from the negative (-) battery terminal when the power supply of the continuously variable valve lift controller assembly is energized.
- Because the VALVEMATIC system memorizes settings when the ignition switch is turned off, make sure to wait at least 1 minute after turning the ignition switch off before disconnecting the cable from the negative (-) battery terminal.
If the cable is disconnected from the negative (-) battery terminal when the power supply is energized or within 1 minute after turning the ignition switch off, DTC P10A0 or P1055 may be stored.
- After performing repairs, perform the following procedures and check that DTCs are not output again.
- After using the Techstream to perform minimum valve lift learning, keep the engine idling for 30 seconds to complete learning. Otherwise, the VALVEMATIC system may not operate normally, causing poor acceleration, etc.
- Read Freeze Frame Data using the Techstream. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.