B1271

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

DTC B1271 - Combination Meter ECU Communication Stop

DESCRIPTION

DTC B1271 is output when communication between the combination meter and the multiplex network gateway ECU stops for more than 10 seconds.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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





(a) Disconnect the C10 connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (COMBINATION METER - GROUND)





(a) 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. CHECK COMMUNICATION LINE





(a) Disconnect the A9 and G4 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





HINT: *1: for Automatic A/C
*2: for Manual A/C

Result:






C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
B -- REPAIR OR REPLACE HARNESS OR CONNECTOR AND COMBINATION METER
A -- REPLACE COMBINATION METER