Engine Control: SFI System

2AZ-FXE ENGINE CONTROL: SFI SYSTEM: U0028,U0037: Vehicle Communication Bus "A"
U0037 - Vehicle Communication Bus "B"

MONITOR DESCRIPTION

The Controller Area Network (CAN) is a serial data communication system for real-time application. It is a multiplex communication system designed for on-vehicle use that provides a superior communication speed of 500 kbps and a capability to detect malfunctions.

The hybrid vehicle control ECU sends and receives data to and from ECUs connected to the V1 bus and V2 bus. If a communication error occurs between the hybrid vehicle control ECU and one of these ECUs, the hybrid vehicle control ECU stores a DTC.





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





CONFIRMATION DRIVING PATTERN





* Connect the Techstream to the DLC3.

* Turn the power switch on (IG) and turn the Techstream on.

* Clear the DTCs DTC Check / Clear.

* Turn the power switch off and wait for at least 30 seconds.

* Turn the power switch on (READY) and turn the Techstream on [A].

* Drive the vehicle for 10 minutes or more [B].

* Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

* Check for DTCs [C].

HINT
* If a DTC is output, the system is malfunctioning.
* If a DTC is not output, perform the following procedure.
* Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

* Input the DTC: U0028 or U0037.

* Check the DTC judgment result.





HINT
If the judgment result shows ABNORMAL, the system has a malfunction.

INSPECTION PROCEDURE

Refer to the CAN Communication System How to Proceed With Troubleshooting.