Circuit Inspection
| Inspection Item | Inspection Condition | (+) Probe | (-) Probe | Specification | ||
|---|---|---|---|---|---|---|
| Connector | Terminal | Connector | Terminal | |||
| Power inspection (CVVD actuator ↔ Chassis ground) |
|
CVVD actuator connector | 1 (Memory power) | Chassis ground | - | B+ |
| CVVD actuator connector | 4 (ON/START Input) | Chassis ground | - | B+ | ||
| Power inspection (CVVD actuator ↔ Chassis ground) |
|
CVVD actuator connector | 1 (Memory power) | Chassis ground | - | B+ |
| CVVD actuator connector | 4 (ON/START Input) | Chassis ground | - | B+ | ||
| Open in circuit inspection (CVVD actuator ↔ Chassis ground) |
|
CVVD actuator connector | 2 (ground) | Chassis ground | - | Approx. below 1Ω |
| PT L-CAN oscilloscope (CVVD actuator) |
|
CVVD actuator connector | 5 (PT L-CAN high) | Chassis ground | - | Fig.1 to 6 |
| CVVD actuator connector | 6 (PT L-CAN low) | Chassis ground | - | |||
Information
It is important to check the waveform on the CAN communication line simultaneously for CAN high and low. The CAN signal is high signal raised to 3.5 V in bus idle state (digital 1") relative to 2.5 V, and the low signal is lowered to 1.5 V, resulting in a voltage difference of 2 V between high and low signals to detect "0". It also monitors whether the high and low signals have conflicting voltages based on 2.5 V as the waveform on the left, monitoring whether the current CAN signal has been transmitted normally. In CAN communication, a continuous "0" signal greater than 6 bits indicates an error. During the CAN communication waveform check, verify that continuous "0" signals of not less than 6 bits occur.
- Reference Voltage Approx. 2.5V (high: 2.5V → 3.5V raise, low: 2.5V → 1.5V decrease)
- idle (2.5V) interval of a constant cycle
- regular data frame time
- high and low frame shapes that are symmetrical
Good
- Go to "COMPONENT INSPECTION " procedure.
No Good
- Repair or replace as necessary and then, Go to "VERIFICATION OF REPAIR " procedure.