M-CAN Communication Line Inspection
| Inspection Item | Inspection Condition | (+) Probe | (-) Probe | Specification | ||
|---|---|---|---|---|---|---|
| Connector | Terminal | Connector | Terminal | |||
| Oscilloscope (AVN) |
|
AVN connector | 7 (M-CAN high) | Chassis ground | - | Fig.1 to 6 |
| AVN connector | 20 (M-CAN low) | Chassis ground | - | |||
Information
CAN Communication Wave monitors signals from CAN High line and CAN Low line simultaneously.
The reference value for the Low Speed CAN signal is 0V and 5V for CAN High signal and CAN Low signal, respectively, in BUS IDLE state (DIGITAL 1). If it rises to 3.5V, it is considered 'High' whereas it sets 'Low' if it drops to 1.5V. "0" is detected when the difference between 'High' and 'Low' is greater than 2V. Also, the information can be used to determine if the 'High' and 'Low' display voltage values reverse to each other.
Good
- Go to "COMPONENT INSPECTION " procedure.
No Good
- Repair open or short in circuit and then Go to "VERIFICATION OF REPAIR " procedure.