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 gateway ECU stops for more than 10 seconds.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK OPERATION
(a) Check that the indicator (READY) on the combination meter illuminates when the hybrid vehicle control system is operating (power switch ON (READY)).
OK:
Indicator can operate properly.
OK -- CHECK RESISTANCE OF COMMUNICATION LINE
NG -- Continue to next step.

2. CHECK WIRE HARNESS (COMBINATION METER - BODY GROUND)




(a) Disconnect the C10 meter connector.
(b) Measure the resistance and voltage of the wire harness side connector.
Standard resistance:






Standard voltage






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

3. CHECK RESISTANCE OF COMMUNICATION LINE




(a) Disconnect the C10 meter connector.
(b) Disconnect the P6 and T11 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 AND REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- REPLACE COMBINATION METER