The HECU sends requirement data, such as torque reduction, the number of fuel cut cylinders, and the ESP control request, to the ECM through CAN bus line. The ECM performs the fuel cut function according to a request signal from the HECU and then retards an ignition timing. The ECM) maintains current gear position during the ESP control period in order not to increase power which causes a Kickdown shift.
The HECU checks the CAN communcation lines for normal ESP control, and sets this code if an ECM message is not received within 500ms.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
CAN message monitoring | 1. Faulty ECM 2. Open or short in CAN communication line 3. Poor connection |
Enable Conditions |
•
In case that EMS1 or EMS2 message was not received for more than 500ms within normal voltage condition | |
Fail Safe |
•
Inhibit the ESP/HAC control and allow the ABS/EBD control
•
The ESP warning lamp is activated |
