Toyota Yaris: Lin Communication System / Power Source Control System Missing Message (B278C87)
DESCRIPTION
When an internal malfunction is detected in the certification ECU (smart key ECU assembly), this DTC is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B278C87 | Power Source Control System Missing Message | An internal malfunction occurs in the certification ECU (smart key ECU assembly). | Certification ECU (smart key ECU assembly) |
CAUTION / NOTICE / HINT
NOTICE:
- When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry & Start (CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
- Before replacing the certification ECU (smart key ECU assembly), refer to Registration.
PROCEDURE
| 1. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
|
| 2. | CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Smart Key > Trouble Codes| Result | Proceed to |
|---|---|
| DTC 278588 is output | A |
| DTC 278588 is not output | B |
| A |
 | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| B |
 | USE SIMULATION METHOD TO CHECK |
ID-BOX Missing Message (B278987)
DESCRIPTION This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) stops for 10 seconds or more...
Other information:
Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Inspection
INSPECTION PROCEDURE 1. INSPECT FUEL PUMP ASSEMBLY (a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition D24-1 - D24-2 20°C (68°F) 0.45 to 0.55 Ω If the result is not as specified, replace the fuel pump assembly...
Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Components
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Fuel-Filler Lid and Cap
WARNING
When removing the fuel-filler cap, loosen the cap slightly and wait for any hissing to stop, then remove it
Fuel spray is dangerous. Fuel can burn skin and eyes and cause illness if ingested. Fuel spray is released when there is pressure in the fuel tank and the fuel-filler cap is removed too quickly.
