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 (meter ECU) and network gateway ECU stops for more than 10 seconds.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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




(a) Disconnect the K31 meter connector.
(b) Measure the resistance and voltage of the wire harness side connector.
Standard Resistance:






Standard Voltage:






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




(a) Disconnect the K31 meter connector.
(b) Disconnect the K66 ECU connector.
(c) Disconnect the K44 sensor connector.
(d) Measure the resistance of the wire harness side connectors.
Standard resistance:






Result





C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
B -- REPAIR OR REPLACE COMBINATION METER ASSEMBLY AND WIRE HARNESS OR CONNECTOR
A -- REPLACE COMBINATION METER (METER ECU)