The ECM systems which communicate over the CAN are the EMS(Engine Management System), TCS(Traction Control System), and TCM(Transmission Control Module). With the introduction of a CAN, only two lines are required to achieve this function. Data is in digital format and this method does not use an integrated ECM. Input signals to TCM through " CAN communication " are as follows.
- Engine rpm, TPS signal, A/C signal, WTS signal, AFS signal, Vss signal, Shift holding signal (FTCS on) Output signals from TCM through " CAN communication " are as follows.
- Request signal for torque reduction, ATF temperature, TCM type, TCM error or not, damper clutch on, off/gear position.
In case of CAN failure, the engine symptoms that will occur are corrupted torque reduction signal information, shift shock, and an abrubt increase in engine rpm.
If a short to ground or open circuit between the ECM and the TCM occurs, or a CAN bus error is detected during two driving cycles, a DTC P0600 code will be set.
DTC NO. | Detecting Condition | Possible Cause |
P 0600 | ● P0600 ① Error between ECM and TCM communication ② Error between ECM and ABS ECM communication ● Engine Condition : IG ON ● Fuel Limit : NO ● Fuel Cut : NO ● EGR OFF : NO ● MIL : NO | ● Open or short in circuit ● TCM ● ECM |
