B1271
Diagnostic trouble codes
DESCRIPTION
This DTC is detected when communication between the combination meter ECU and gateway ECU stops for more than 10 seconds.| DTC No. |
DTC Detection Condition |
Trouble Area |
| B1271 |
Combination meter ECU communication stops |
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WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- When "+B of GND short malfunction of communication bus" DTCs (B1266 and B1267) are detected at the same time as "communication stop" DTC B1271, repair the "+B or GND short malfunction of communication bus" DTCs first.
| 1. INSPECT FUSE (DOME, MPX-B) |
Remove the DOME and MPX-B fuses from the engine room J/B No. 1.
Measure the resistance of the fuses.
- Standard resistance:
- Below 1 Ω
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| OK | |
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| Go to step 3 |
| 2. CHECK WIRE HARNESS (COMBINATION METER ECU - BATTERY AND BODY GROUND) |
Disconnect the J34 ECU connector.
Measure the voltage and resistance of the wire harness side connector.
- Standard voltage:
Tester Connection
Condition
Specified Condition
B (J34-23) - Body ground
Always
10 to 14 V
B (J34-24) - Body ground
Always
10 to 14 V
- Standard resistance:
Tester Connection
Specified Condition
E2 (J34-1) - Body ground
Below 1 Ω
ES (J34-13) - Body ground
Below 1 Ω
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| OK | |
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| 3. CHECK RESISTANCE OF COMMUNICATION LINE |
Disconnect the J34, J76, A27 and J58 ECU connectors.
Measure the resistance between the specified terminals on the wire harness side connectors.
- Standard resistance:
Tester Connection
Specified Condition
MPX- (J34-18) - MPI1 (J76-4)
Below 1 Ω
*1MPX+ (J34-6) - MPX2 (A27-6)
Below 1 Ω
*2MPX+ (J34-6) - MPX- (J58-31)
Below 1 Ω
- HINT:
- *1: w/ Adaptive front-lighting system
- *2: w/o Adaptive front-lighting system
- *1: w/ Adaptive front-lighting system
- Result:
Result
Proceed to
Both are OK
A
One is OK
B
Both are NG
C
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| OK | ||
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