The HECU send requirement data, such as Torque reduction, the number of fuel cut cylinders, and ESP control requests, to the Engine PCM(ECM & TCM) through CAN bus line.
The Engine PCM(ECM) performs fuel cut functions according to requests from the HECU and retards ignition timing by torque reduction requests.
The PCM(TCM) maintains current gear positions during ESP control time, 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.
The HECU does not detect this code until 2 seconds after the IG KEY is turned to ON.
Item
Detecting Condition
Possible cause
DTC Strategy
CAN message monitoring
Faulty PCM(ECM)
Faulty HECU
Enable Conditions
In case that EMS1 or EMS2 message was not received for more than 500ms within normal voltage condition.
- The Monitoring starts 2000 ms after Power Up.
Fail Safe
Inhibit the ESP control and allow the ABS/EBD control.
The ESP warning lamp is activated.