What is the HICM Resistance Learning Value reset?
The HICM (Heated Intake Camshaft) Resistance Learning Value reset is a procedure that involves resetting a specific parameter stored in the engine control unit (ECU) of a vehicle. This parameter, known as the HICM Resistance Learning Value, is used by the ECU to track and adjust for changes in the resistance of the HICM sensor over time.
The HICM sensor is a component of the variable valve timing (VVT) system, which is responsible for adjusting the timing of the intake camshaft to improve engine performance, fuel efficiency, and emissions. As the HICM sensor ages, its resistance can change, and the ECU uses the HICM Resistance Learning Value to compensate for these changes and maintain optimal operation of the VVT system.
There are several situations in which the HICM Resistance Learning Value may need to be reset:
1. After replacing the HICM sensor: When a new HICM sensor is installed, it will have a different resistance profile than the old one, so the ECU’s learned value needs to be reset to accurately compensate for the new sensor.
2. To troubleshoot engine performance issues: If the engine is experiencing problems related to the VVT system, resetting the HICM Resistance Learning Value can help the ECU relearn the correct resistance and potentially improve performance.
3. As part of a comprehensive engine service: Resetting the HICM Resistance Learning Value may be recommended as part of a larger ECU reset or engine service procedure.
To reset the HICM Resistance Learning Value, a diagnostic tool or scanner that can communicate with the vehicle’s ECU is typically required. The specific steps may vary by vehicle make and model, but generally involve connecting the diagnostic tool to the vehicle’s OBD-II port, locating the HICM Resistance Learning Value reset function within the tool’s menu, and initiating the reset procedure while following any on-screen instructions.
Instruction to Access the HICM Resistance Learning Value resetin the OBD Scanner
The HICM Resistance Learning Value resetcan be accessed by following this instruction.
- Open your OBD scanner.
- Select Local Diagnose if you are using Launch X431.
- Select Car Brand Select Model (auto-detect is better to detect the vehicle VIN).
- Select and check the following: ECMECT (Engine and ECT), ECM (Engine Control Module)
- Select Special Function Then click HICM Resistance Learning Value reset.
The sample car model with this feature is the Toyota 4Runner 2019.
It’s important to note that resetting the HICM Resistance Learning Value or other learned values in the ECU should be done only when necessary, as the ECU has learned these values over time to optimize the engine’s performance and efficiency. Resetting them may cause the engine to run less optimally until the ECU can relearn the values. Additionally, in some cases, the reset procedure may need to be performed using specialized diagnostic equipment or at a dealer/manufacturer service center.