B1271

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

DTC B1271 - Combination Meter ECU Communication Stop

DESCRIPTION

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






WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: If "+B of GND short malfunction of communication bus" DTCs (B1266 and B1267) are detected at the same time as "communication stop" DTC B1271, repair the "+B or GND short malfunction of communication bus" DTCs first B1266.

PROCEDURE

1. INSPECT FUSE (DOME, MPX-B)
(a) Remove the DOME and MPX-B fuses from the engine room relay block No. 1.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE FUSE (DOME, MPX-B)
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (COMBINATION METER - BATTERY AND BODY GROUND)





(a) Disconnect the J34 connector.
(b) Measure the voltage and resistance of the wire harness side connector.
Standard Voltage:






Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER - BATTERY AND BODY GROUND)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)





(a) Disconnect the J34, J49 and A27 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE COMBINATION METER