Button Engine Start System

General Description

This is DTC which is related with communication error between PDM and other units.
(** Control Units : BCM (Body Control Module), PDM(Power Distribution Module), SMK(Smart Key) ECU.
* 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. (This is less expensive.)






DTC Description

This is DTC which is related with communication error between PDM and other units.
** Control Units : BCM(Body Control Module), PDM(Power Distribution Module), CLU(Cluster), SMK(Smart Key) ECU.
Case1: After short between PDM CAN Low Line and High Line, short to ground together.
Case2: After short between PDM CAN Low Line and High Line, short to power together.
** This code is occurred when It is not possible to transmit data by CAN Line in those way of Software and Hardware. But, It is possible to receive data by CAN Line.
This code reports BUS OFF status when data transmit error count number is over 255. The purpose is to verify the status of CAN controller and CAN communication line when error is detected.
According to operation condition, some of module which are connected to CAN line may not detect B1603.
Also, B1602 coincides with B1603 at all times.

CAUTION:
Difference between CAN ERROR and CAN BUS ERROR
CAN Error : MIL On, CAN Bus Error : No MIL

DTC Detecting Condition






Diagnostic Circuit Diagram






Signal Waveform & Data










Fig.1) Signal waveform of CAN Low and HIGH
Fig.2) CAN BUS VOLTAGE LEVEL (LOW SPEED CAN)

Monitor Scantool Data

Check DTC
1. Connect GDS.
2. IG "ON" and engine "OFF".
3. Select "DTC Analysis" mode.
4. After erase DTC, keep the vehicle condition within "the enable conditions"







5. Is the same DTC occurred again?






Terminal & Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?






Component Inspection

Check internal errors of CAN communication in PDM.
1. Replace with a known-good PDM after removing installed PDM
2. Connect GDS.
3. IG "ON" and engine "OFF".
4. Select "DTC Analysis" mode.
5. Is the code erased?






Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "DTC Analysis" mode.
2. Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
3. Is any DTC outputted again?