Parent/child module diagnosis
WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
- Each CAN bus consists of a parent module which integrates multiple modules, and other child modules.
- When a child module detects a malfunction, it sends the malfunction information to the parent module via CAN communication, and the parent module outputs a DTC according to the malfunction content.NOTE:
- DTCs are not supported, but because the data logger also has child modules which it supports, verify DTCs even with the child modules if the PID/data monitor function or simulation function is used.
- The parent/child module relationship for each CAN bus is as follows.
-: Not applicable
PARENT AND CHILD MODULE DIAGNOSIS
| Parent module | Body control module (BCM) | Vehicle control module | PCM | TCM |
|---|---|---|---|---|
| Child module | Electrical supply unit (ESU) | Rear side radar sensor | NOx sensor | Shift panel (indicator) |
| Door-electrical supply unit | Front radar sensor | PM sensor | - | |
| LF control unit | Parking assist unit (ultrasonic) | - | - | |
| Light control module | Driver monitoring camera unit | - | - | |
| Instrument cluster | 360° view monitor control module | - | - | |
| Active driving display | Parking assist unit (optical) | - | - | |
| Steering angle sensor | Forward sensing camera (FSC) | - | - | |
| - | Front side radar sensor | - | - |
*: Differs depending on availability of each module, based on the specification.