Toyota Yaris: Sfi System / MIL Circuit
DESCRIPTION
The Malfunction Indicator Lamp (MIL) is used to indicate vehicle malfunctions detected by the ECM.
The MIL operation can be checked visually. When the ignition switch is first turned to ON, the MIL should be illuminated and should then turn off after the engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the GTS.
WIRING DIAGRAM
PROCEDURE
| 1. | CHECK THAT MIL IS ILLUMINATED |
(a) Perform troubleshooting in accordance with the table below.
| MIL | Condition | Proceed to |
|---|---|---|
| Illuminates → Turns off | Ignition switch ON → engine is started | A |
| Other than above | - | B |
| A |
 | CHECK FOR INTERMITTENT PROBLEMS |
|
| 2. | CHECK COMMUNICATION BETWEEN GTS AND ECM |
(a) Check the communication between the GTS and ECM.
HINT:
It can be checked using the "Engine" item of the Data List.
| Result | Proceed to |
|---|---|
| Communication is possible | A |
| Communication is not possible | B |
| B |
 | GO TO VC OUTPUT CIRCUIT |
|
| 3. | CHECK WHETHER DTC OUTPUT RECURS |
(a) Perform the Health Check using the GTS.
(b) Check if any DTCs have been detected. Note down any DTCs.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| Any DTCs is output | B |
HINT:
Check for detected DTCs output from other ECUs which relate to the MIL.
| B |
 | REPAIR CIRCUIT INDICATED BY OUTPUT |
|
| 4. | PERFORM ACTIVE TEST USING GTS |
(a) Check the status of the MIL while performing the Active Test.
Body Electrical > Combination Meter > Active Test| Tester Display |
|---|
| Check Engine Warning |
| Result | Proceed to |
|---|---|
| Changes | A |
| Does not change | B |
| A |
 | REPLACE ECM |
| B |
 | REPLACE COMBINATION METER ASSEMBLY |
Brake Override System
DESCRIPTION When the vehicle is being driven, depressing the accelerator pedal sensor assembly and brake pedal will activate the brake override system to restrict engine output...
Ignition Circuit
DESCRIPTION A direct ignition system is used on this vehicle. The direct ignition system is a 1 cylinder ignition system which ignites one cylinder with one ignition coil...
Other information:
Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid (B279986)
DESCRIPTION If there is a communication malfunction between the ECM and ID code box (immobiliser code ECU), or when the communication ID codes do not match, the ECM stores this DTC. DTC No. Detection Item DTC Detection Condition Trouble Area Note B279986 Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid Either of the following conditions is met (1 trip detection logic*): A malfunction is detected in the communication or communication lines between the ECM and ID code box (immobiliser code ECU)...
Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Security Indicator Light Does not Blink
DESCRIPTION The certification ECU (smart key ECU assembly) blinks the security indicator light (combination meter assembly) when the immobiliser is set (engine switch off). The certification ECU (smart key ECU assembly) receives the security indicator light signal from the main body ECU (multiplex network body ECU) via CAN communication when the theft deterrent system is in the arming preparation state or alarm sounding state...
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Front Seat Belt Pretensioners
The front seat belt pretensioners are designed to deploy in moderate or severe frontal, near frontal collisions.
In addition, the pretensioners operate when a side collision or a rollover accident is detected. The pretensioners operate differently depending on what types of air bags are equipped. For more details about the seat belt pretensioner operation, refer to the SRS Air Bag Deployment Criteria.
