MaxxECU offers a powerful feature to read engine data from any OBD-II compliant vehicle’s ECU. This functionality is primarily used in piggyback applications, allowing MaxxECU to access critical engine parameters.
Important Note: Disconnect the MaxxECU unit when using any other OBD-II diagnostic tool to prevent conflicts. Also, be aware that this feature might not be available in all vehicles due to variations in system implementations.
CAN OBD-II ID Setup
OEM ECUs often handle broadcast requests differently. MaxxECU provides options to configure the CAN bus communication for optimal data retrieval. This involves setting the request and response ECU IDs.
Request ECU ID: This ID specifies the target ECU for data requests. Using the broadcast ID (0x7DF) requests data from all ECUs, increasing CAN bus load but potentially necessary for certain vehicles.
Response ECU ID: This ID determines the ECU from which MaxxECU listens for data responses. In most cases, the request and response ECU IDs share the same functional value.
Common CAN OBD-II ID Configurations
This example demonstrates a common setup: requesting engine data parameters from functional ID “0” and receiving responses from the same ID.
This scenario illustrates a broadcast request (ID 0x7DF) to all ECUs, with the response originating from functional ID “0”. This method increases CAN bus load.
Reading Specific Parameters with MaxxECU OBD2
MaxxECU can read a range of essential engine parameters via the OBD-II protocol:
- CLT (Coolant Temperature): Reads and utilizes the vehicle’s CLT data.
- IAT (Intake Air Temperature): Reads and utilizes the vehicle’s IAT data.
- TPS (Throttle Position Sensor): Reads and utilizes the vehicle’s TPS data.
- MAP (Manifold Absolute Pressure): Reads and utilizes the vehicle’s MAP data.
- SPEED: Reads and utilizes the vehicle’s speed data.
- Lambda: Reads and utilizes the vehicle’s oxygen sensor data. Remember to configure the lambda sensor input in MaxxECU to “lambda from OBD2 input system”.
- TORQUE: Reads the engine’s torque value.
- RPM: Reads the engine’s RPM. Note: This value is for monitoring only and should not be used for fuel or ignition control.
For more customized OBD-II PID requests, utilize the MaxxECU CAN Inputs system, which allows you to specify and read specific parameters from the vehicle’s ECU. This enables in-depth monitoring and data analysis.
Implementing MaxxECU OBD2 for CLT Reading
This example shows how to enable CLT reading from OBD-II:
- Navigate to “CAN Bus” -> “CAN OBD2 input” within the MaxxECU software.
- Enable the “get CLT from OBD2” feature. This instructs MaxxECU to prioritize the OBD-II CLT data from the stock ECU, overriding any data from the CLT electrical inputs. This seamlessly integrates the stock ECU’s CLT readings into the MaxxECU system.
