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 communicaton is one of the vehicle communications method, which is now widely used to transfer signals.
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 malfuncting and sets this code.
Item | Detecting Condition & Fail Safe | Possible Cause |
DTC Strategy | ● Check voltage range | ● Open or Short in CAN communication harness. ● Faulty ECM. ● Faulty TCM. |
Enable Conditions | ● IG switch on ● No actuator test ● No FAIL SAFE status of 3rd gear holding ● No FAIL in PG-A,B ● Power voltage ≥ 10V is detected for a series of 0.5 sec ● Engine STOP | |
Threshold Value | ● In case of no ECU information | |
Diagnostic Time | ● 0.5 Sec. | |
Fail safe | ● INTELLIGENT SHIFT and is inhibited ● Learning for oil pressure control is inhibited ● Torque Retard requirement is inhibited ● Direct connection control of TCC is inhibited |
Connect scantool to data link connector(DLC).
Engine "ON".
Monitor the "CAN COMMUNICATION SERVICE DATA (ENGINE RPM, VEHICLE SPEED SENSOR, THROTTLE P. SENSOR)" parameters on the scantool.
Compare it with referance data as below.
Does "CAN BUS LINE DATA " follow the referance data?
▶ 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.
▶ Replace PCM/TCM and then go to "Verification of Vehicle Repair" procedure.
After a repair, it is essential to verify that the fault has been corrected.
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
Using a scantool, Clear DTC.
Operate the vehicle within DTC Enable conditions in General information.
Are any DTCs present?
Go to the applicable troubleshooting procedure.
▶ System performing to specification at this time.
