M-CAN Inspection
| Inspection Item | Inspection Condition | (+) Probe | (-) Probe | Specification | ||
|---|---|---|---|---|---|---|
| Connector | Terminal | Connector | Terminal | |||
| Open in circuit inspection (HUD ↔ ICU) |
|
HUD connector | 5 (M-CAN high) | ICU connector | 6 (M-CAN high) | Approx. below 1Ω |
| HUD connector | 6 (M-CAN low) | ICU connector | 7 (M-CAN low) | Approx. below 1Ω | ||
| M-CAN oscilloscope (ICU) |
|
ICU connector | 6 (M-CAN high) | Chassis ground | - | Fig.1 to 6 |
| ICU connector | 7 (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.