Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fail safe: Description
When a DTC is detected, ECM executes a mode (in the Fail-safe mode) applicable to the DTC. The fail-safe mode has the preset traveling control mode (accelerator angle variation and engine output limit) and device fix mode.
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Fail safe mode |
Vehicle behavior |
Fail safe pattern |
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Traveling control mode |
Accelerator angle variation control |
ECM controls the accelerator pedal depression speed to make it slower than actual speed. This causes a drop in accelerating performance and encourages the driver to repair malfunction.
NOTE:
ECM does not control the accelerator pedal releasing speed.
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A |
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Engine output control |
ECM reduces the engine output, according to the rise in engine speed. This reduces the vehicle speed to encourage the driver to repair malfunction. Driving at 70 km/h (44 MPH) or more is possible.
NOTE:
This value is a reference value converted from engine power to vehicle speed.
Actual power limitation value differs due to the malfunctioning part and driving condition. |
B |
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Device fix mode |
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C |
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Combustion control mode |
Stratified charge combustion control at starting |
No stratified charge combustion at starting (cold start). |
D |
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Idle speed control |
Stops feedback control of idle speed and controls with specified speed. |
E |
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Recovery speed control at decelerating |
Stops recovery speed control by the fuel cut at decelerating and controls with specified speed. |
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Ignition timing correction control |
Partially controls ignition timing control. |
F |
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Retardation control |
Controls ignition timing delay control in the intermediate water temperature range. |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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