Brake System > ESC(Electronic Stability Control) System > C1647 CAN Hardware Error

Component Location

General Description

When the vehicle is turning with respect to a vertical axis the yaw rate sensor detects the yaw rate electroniclly by the vibration change of plate fork inside the yaw rate sensor.

If yaw velocity reaches the specific velocity after it detects the vehicle' yawing, the ESC control is reactivated.

The later G sensor senses vehicle's lateral G. A small element inside the sensor is attached to a deflectable leverarm by later G.

Direction and magnitude of lateral G loaded to vehicle can be known with electrostatic capacity changing according to lateral G.

It interchanges signals with HECU through extra CAN line which only used for communication between HECU and sensor.

DTC Description

The HECU checks the sensor CAN H/W for normal ESC control, and sets this code if a sensor CAN H/W malfunction is detectedcted.

DTC Detecting Condition

Item

Detecting Condition

Possible cause

DTC
Strategy

•	Internal Monitoring

•	Faulty HECU

•	Faulty Yaw Rate & Lateral G sensor

Enable
Conditions

•	Sensor CAN H/W failure.

Fail Safe

•	Inhibit the ESC control and allow the ABS/EBD control.

•	The ESC warning lamp is activated

Schematic Diagram

Terminal and Connector Inspection

1.	Many malfunctions in the electrical system are caused by poor harness(es) and terminal condition. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

2.	Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

	▶ Repair as necessary and then go to "Verification Of Vehicle Repair" procedure.
	▶ Go to "Component Inspection" procedure.

Component Circuit Inspection

1.	Ignition "OFF" & Engine "OFF".

2.	Ignition "ON" & Engine "OFF".

3.	Connect scantool and select "Diagnostic Trouble Codes(DTCs)" mode.

4.	Using a scantool, Clear DTC.

5.	Select "Diagnostic Trouble Codes(DTCs)" mode again.

Are any DTCs present ?

	▶ Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU and then go to "Verification Of Vehicle Repair" procedure.
	▶ Fault is intermittent caused by faulty HECU or was repaired and HECU memory was not cleared. Go to "Verification Of Vehicle Repair" procedure.

Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.

1.	Connect scantool and select "Diagnostic Trouble Codes(DTCs)" mode.

2.	Using a scantool, Clear DTC.

3.	Operate the vehicle within DTC Detecting Condition in General Information.

4.	Using a scantool, Check DTC present.

Are any DTCs present ?

	▶ Go to the applicable troubleshooting procedure.
	▶ System performing to specification at this time.