Engine Control System: 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), device fix mode and combustion control 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 |
|
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.
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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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Fail Safe List
x:Applicable --: Not applicable
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DTC No. |
Detected items |
Vehicle behavior |
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Pattern |
Others |
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A |
B |
C |
D |
E |
F |
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P0011 P0012 P0016 |
Intake valve timing control |
-- |
-- |
x |
-- |
-- |
-- |
-- |
|
|
P0014 P0015 P0017 |
Exhaust valve timing control |
-- |
-- |
x |
-- |
-- |
-- |
-- |
|
|
P0075 |
Intake valve timing control solenoid valve |
-- |
-- |
x |
-- |
-- |
-- |
-- |
|
|
P0078 |
Exhaust valve timing control solenoid valve |
-- |
-- |
x |
-- |
-- |
-- |
-- |
|
|
P0087 P0088 |
FRP control system |
x |
-- |
-- |
x |
-- |
-- |
-- |
|
|
x |
-- |
x |
x |
-- |
-- |
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P0090 |
x |
-- |
x |
x |
-- |
-- |
-- |
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P0101 |
Mass air flow sensor circuit |
x |
-- |
-- |
x |
-- |
-- |
-- |
|
|
x |
x |
x |
x |
x |
x |
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P0102 P0103 |
x |
x |
x |
x |
x |
x |
-- |
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P0117 P0118 |
Engine coolant temperature sensor circuit |
-- |
-- |
-- |
x |
x |
-- |
Engine speed will not rise more than 1, 800 rpm due to the fuel cut. |
|
|
P0122 P0123 P0222 P0223 P2135 |
Throttle position sensor |
-- |
-- |
-- |
-- |
-- |
-- |
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. So, the acceleration will be poor.
NOTE:
If throttle position sensor 1 and 2 malfunction at the same time conducts following control.
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P0171 P0172 |
Fuel injection system |
x |
-- |
-- |
x |
x |
-- |
-- |
|
|
P0190 |
FRP sensor |
x |
-- |
x |
x |
x |
-- |
-- |
|
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P0191 P0192 P0193 P119A P119B P119C |
x |
-- |
-- |
x |
-- |
-- |
-- |
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P0196 P0197 P0198 |
Engine oil temperature sensor |
-- |
-- |
-- |
-- |
-- |
-- |
Intake and exhaust valve timing control does not function. |
|
|
P0201 P0202 P0203 P0204 |
Injector |
x |
-- |
-- |
x |
-- |
-- |
-- |
|
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P0300 P0301 P0302 P0303 P0304 |
Misfire |
x |
-- |
-- |
x |
x |
-- |
-- |
|
|
P0335 |
Crankshaft position sensor |
-- |
-- |
x |
-- |
-- |
-- |
-- |
|
|
P0340 |
Camshaft position sensor |
-- |
-- |
x |
-- |
-- |
-- |
-- |
|
|
P0365 |
Exhaust valve timing control position sensor |
-- |
-- |
x |
-- |
-- |
-- |
-- |
|
|
P0500 |
Vehicle speed sensor |
x |
-- |
-- |
x |
x |
-- |
-- |
|
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P0524 |
Engine oil pressure |
-- |
-- |
-- |
-- |
-- |
-- |
|
|
|
P0603 P0607 |
ECM |
x *1 |
x *1 |
-- |
-- |
-- |
-- |
-- |
|
|
P0604 P060B |
-- |
-- |
x |
-- |
-- |
-- |
(Computing part of ECM does not operate normally.) ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring. |
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|
P0605 P0606 |
-- |
-- |
x *1 |
-- |
-- |
-- |
(Computing part of ECM does not operate normally.) ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring. *1 |
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|
P060A |
-- |
-- |
x |
-- |
-- |
-- |
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring. |
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|
x |
x |
x |
-- |
-- |
-- |
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P062B |
x *1 |
-- |
-- |
x *1 |
-- |
-- |
NOTE:
Fail-safe mode may not start depending on malfunction type of ECM.
|
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P062D |
x |
-- |
x |
x |
-- |
-- |
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P0643 |
Sensor power supply |
-- |
-- |
x |
-- |
-- |
-- |
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring. |
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|
P1197 |
Out of gas |
-- |
-- |
x |
-- |
-- |
-- |
Engine torque is limited. |
|
|
P1217 |
Engine over temperature |
-- |
-- |
-- |
-- |
-- |
-- |
Engine speed will not rise more than 1, 800 rpm due to the fuel cut. |
|
|
P1805 |
Brake switch |
-- |
-- |
-- |
-- |
-- |
-- |
ECM controls the electric throttle control actuator by regulating the throttle opening to a small range. Therefore, acceleration will be poor. |
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Vehicle condition |
Driving condition |
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When engine is idling |
Normal |
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When accelerating |
Poor acceleration |
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P2004 |
Intake manifold runner control valve |
x |
x |
x |
x |
-- |
-- |
-- |
|
|
P2014 P2016 P2017 P2018 |
Intake manifold runner control valve position sensor |
-- |
-- |
x |
-- |
-- |
-- |
-- |
|
|
P2100 P2103 |
Throttle control motor relay |
-- |
-- |
x |
-- |
-- |
-- |
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring. |
|
|
P2101 |
Electric throttle control function |
-- |
-- |
x |
-- |
-- |
-- |
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring. |
|
|
P2118 |
Throttle control motor |
-- |
-- |
x |
-- |
-- |
-- |
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring. |
|
|
P2119 |
Electric throttle control actuator |
x |
x |
-- |
-- |
-- |
-- |
-- |
|
|
-- |
-- |
x |
-- |
-- |
-- |
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
NOTE:
For pattern A and B refer to A and B of P2119 DTC detection logic. (Refer to DTC Description
..)
For C of P2119 DTC detection logic ECM behaves as above. |
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P2122 P2123 P2127 P2128 P2138 |
Accelerator pedal position sensor |
-- |
-- |
x |
-- |
-- |
-- |
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. Therefore, the acceleration will be poor.
NOTE:
If accelerator pedal position sensor 1 and 2 malfunction at the same time conducts following control.
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