Component Location
Description

The ECM communicates over the CAN with the EMS(Engine Management System), TCS(Traction Control System) and

TCM(Transmission Control Moudle). Through CAN, only two Lines are required to achieve the same function. The information is in digital format . This method does not use a 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 the CAN failure, the engine symptoms will occur the corrupted torque reduction signal information, shift shock and increasing engine rpm abruptly.

If the CAN communication is generated threshold value, the ECM judged this as a fault and DTC is set.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

● Signal check, high and low

● Open in signal circuit

● Short to ground in signal circuit

● Faulty TCM

● Faulty ECM

Enable Conditions

● Ignition on

Threshold Value

● Error between ECM and TCM communication.

Diagnostic Time

● 1 sec.

MIL

Fuel Limit

Fuel Cut

EGR Off

● No

● No

● No

● No

Schematic Diagram
Signal Waveform
Яндекс.Метрика