This is DTC which is related with communication error between IPM and other units.
(※ Control Units : IPM(Inter Panel Module), FAM(Front Area Module), PDM(Power Distribution Module), DDM(Drive Door Module), ADM(Assist Door Module), CLU(Cluster), PSM(Power Seat Module), SCM(Steering Control Module), RAM(Rear Area Module), SMK(Smart Key)
*¹ CAN (Controller Area Network) : CAN is serial bus communication type which links not only communication system but also control units each other.
*² LIN (Local Interconnect Network) : LIN is serial communication type which is used in electrical control system.
Pattern | Status | Communication is normal but DTC set if IPM detects 7 error status as follows. ① Short to battery in CAN High circuit ② Short to ground in CAN High circuit ③ Short to battery in CAN Low circuit ④ Short to ground in CAN Low circuit ⑤ Short between CAN High and Low circuit ⑥ Open or Poor connection in CAN Low circuit ⑦ Open or Poor connection in CAN High circuit |
1 | Open in CAN High circuit | |
2 | Open in CAN Low circuit | |
3 | Short to battery in CAN High circuit | |
4 | Short to battery in CAN Low circuit | |
5 | Short to ground in CAN High circuit | |
6 | Short to ground in CAN Low circuit | |
7 | Short between CAN High and Low circuit |
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
CAN communication status |
•
Short to battery / ground in CAN high circuit
•
Short to battery / ground in CAN low circuit
•
Short between CAN high and CAN low circuit
•
Open or poor connection in CAN high and low circuit
•
Faulty IPM | ||
Enable Conditions |
•
IG "ON"
•
Engine "START"
•
B/T voltage engerzied to IPM | |||
Threshold Value | CAN high | 0 V | Short to ground | |
B+ V | Short to battery | |||
CAN low | 0 V | Short to ground | ||
B+ V | Short to battery | |||
Diagnostic Time |
•
Failure continues for 2sec. | |||
DTC Erasing Time |
•
DTC is erased immediately after trouble fixed (In case of the past error, perform DTC erasing procedure.) | |||
Fig 1) Signal waveform of CAN Low and HIGH
Fig 2) CAN BUS VOLTAGE LEVEL (LOW SPEED CAN)
