B2786

NETWORKING: LIN COMMUNICATION SYSTEM: B2786: No Response from Steering Lock ECU
B2786 - No Response from Steering Lock ECU

DESCRIPTION

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and transmission control ECU assembly stops for 10 seconds or more.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
Although "No Response from Steering Lock ECU" is displayed on the Techstream, this message is shown if the certification ECU (smart key ECU assembly) cannot communicate with the transmission control ECU assembly.

NOTICE:
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.
* If the certification ECU (smart key ECU assembly) is replaced, register the keys Engine Immobilizer System.
* If the transmission control ECU assembly is replaced, register the ECU code Engine Immobilizer System.
* When using the Techstream to troubleshoot with the power switch off:
* Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.
PROCEDURE

1. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU ASSEMBLY - BATTERY AND BODY GROUND)

(a) Disconnect the A35 and A36 transmission control ECU assembly connectors.

(b) Measure the resistance and voltage according to the value(s) in the table below.

Standard Resistance:





Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - TRANSMISSION CONTROL ECU ASSEMBLY)

(a) Disconnect the F50 certification ECU (smart key ECU assembly) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. REPLACE TRANSMISSION CONTROL ECU ASSEMBLY

(a) Replace the transmission control ECU assembly Removal.

NEXT -- Continue to next step.

4. CHECK DTC OUTPUT

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Recheck for DTCs.

OK:

DTC B2786 is not output.

NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal

OK -- END (TRANSMISSION CONTROL ECU ASSEMBLY WAS DEFECTIVE)