B1271

NETWORKING: MULTIPLEX COMMUNICATION SYSTEM: B1271: Combination Meter ECU Communication Stop
B1271 - Combination Meter ECU Communication Stop

DESCRIPTION

This DTC is stored if communication between the combination meter assembly and gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
If DTC B1266 or B1267 (+B or GND short malfunction of communication bus) is stored at the same time as DTC B1271, perform troubleshooting for DTC B1266 or B1267 first.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY AND BODY GROUND)

(a) Disconnect the J34 connector.





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

Standard Voltage:





Standard Resistance:





Text in Illustration





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

2. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)

(a) Disconnect the J76 connector.

(b) Disconnect the J58 connector.





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

Standard Resistance:





Text in Illustration





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

3. REPLACE COMBINATION METER ASSEMBLY

(a) Replace the combination meter assembly Removal.

NEXT -- Continue to next step.

4. CHECK DTC OUTPUT

(a) Clear the DTC Multiplex Communication System.

(b) Recheck for DTCs.

OK:

DTC B1271 is not output.

NG -- REPLACE GATEWAY ECU Removal

OK -- END (COMBINATION METER ASSEMBLY WAS DEFECTIVE)