Toyota RAV4 manuals

Toyota Sienna Service Manual: 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.

DTC No.

DTC Detection Condition

Trouble Area

B1271

Combination meter communication stops
  • Combination meter
  • Wire harness

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK HARNESS AND CONNECTOR (COMBINATION METER - BATTERY)

CHECK HARNESS AND CONNECTOR (COMBINATION METER - BATTERY)

  1. Disconnect the C10 connector.
  2. Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

2 CHECK HARNESS AND CONNECTOR (COMBINATION METER - GROUND)

CHECK HARNESS AND CONNECTOR (COMBINATION METER - GROUND)

  1. Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

3 CHECK COMMUNICATION LINE

CHECK COMMUNICATION LINE

  1. Disconnect the A9 and G4 connectors.
  2. Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

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

Result

Result

REPLACE COMBINATION METER

A/C ECU Communication Stop
DTC B1262 A/C ECU Communication Stop DESCRIPTION DTC B1262 is output when communication between the A/C amplifier and the multiplex network gateway ECU stops for more than 10 seconds. ...

Power Seat ECU Communication Stop
DTC B1272 Power Seat ECU Communication Stop DESCRIPTION This DTC is detected when communication between the seat position control ECU and the multiplex network gateway ECU stops for more than 10 ...

Other materials:

Checking the messages
Display the message inbox screen. Select the desired message from the list. Check that the message is displayed. E-mails: Select “Mark Unread” or “Mark Read” to mark mail unread or read on the message inbox screen. This function is available when “Update Read Stat ...

Disassembly
1. INSPECT PACK CLEARANCE OF FORWARD CLUTCH HINT: (See page AX-242) 2. REMOVE FORWARD MULTIPLE DISC CLUTCH DISC (a) Using a screwdriver, remove the snap ring. (b) Remove the flange, 5 discs and 5 plates from the input shaft assembly. 3. REMOVE FORWARD CLUTCH RETURN SPRING SUB-ASSEMB ...

How to proceed with troubleshooting
1 VEHICLE BROUGHT TO WORKSHOP 2 CUSTOMER PROBLEM ANALYSIS 3 CHECK AND CLEAR DTCs Refer to the diagnostic check/clear 4 PROBLEM SYMPTOM CONFIRMATION 5 SYMPTOM SIMULATION 6 CHECK DTC 7 CHECK IF THE SAME SYMPTOM APPEARS IN THE NAVIGATION SYSTEM Refer to the navigation system 8 PROBLE ...

© 2011-2019 Copyright www.tsienna.net