B1271

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

DTC B1271 - Combination Meter ECU Communication Stop

DESCRIPTION

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






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK TACHOMETER (OPERATION)
(a) Check that the tachometer can operate properly while the engine is idling.
OK:
Tachometer can operate properly while the engine is idling.
OK -- REPLACE COMBINATION METER ASSEMBLY
NG -- Continue to next step.
2. CHECK WIRE HARNESS (COMBINATION METER - BATTERY AND BODY GROUND)




(a) Disconnect the C8 meter connector.
(b) Measure the voltage and resistance of the wire harness side connector.
Standard voltage:






Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE




(a) Disconnect the C8 meter connector.
(b) Disconnect the G3 and S6 ECU connectors.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






Result





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