P1603

DTC P1603 CAN COMMUNICATION BUS OFF

COMPONENT LOCATION:

GENERAL DESCRIPTION
The TCM can either receive data from the Engine Control Module or ABS control module, or it can send data to the ECM and ABSCM by using CAN communication. The CAN communication is one of the vehicle communications method, which is now widely used to transfer the vehicle data.

DTC DESCRIPTION
The TCM reads data on the CAN-BUS line and checks whether the data is equal to the data which the TCM sent before. If the data is not the same the TCM decides that either the CAN-BUS line or TCM are malfunctioning and sets this code.

DTC DETECTING CONDITION

DTC DETECTING CONDITION:

MONITOR SCAN TOOL DATA
1. Connect scan tool to data link connector (DI-C).
2. Engine "ON".
3. Monitor the "CAN COMMUNICATION SERVICE DATA (ENGINE RPM, VEHICLE SPEED SENSOR, THROTTLE P. SENSOR)" parameters on the scan tool.





Does "CAN BUS LINE DATA" follow the reference data?
YES - Fault is intermittent caused by poor contact in the sensor's and/or PCM/TCM's connector or was repaired and PCM/TCM memory was not cleared. And go to Verification of Vehicle Repair procedure.
NO - Go to "W/Harness Inspection" procedure.

VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using a scan tool, Clear DTC.
3. Operate the vehicle within DTC; Enable conditions in General information.
4. Are any DTCs present?
YES - Go to the applicable troubleshooting procedure. Transmission
NO - System performing to specification at this time.