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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) and device fix mode.

Fail safe mode Vehicle behavior Fail safe pattern
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: SYMBOL ECM does not control the accelerator pedal releasing speed.
 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: SYMBOL 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
Device fix mode
  • Fixes electric intake valve timing control motor in the reference position.
  • Fixes exhaust valve timing control solenoid valve in the reference position.
  • A control signals is not transmitted to EGR volume control valve and the EGR volume control is deactivated.
  • The Intake manifold runner control valve motor is turned OFF (Intake manifold runner control valve opens).
 C
Combustion control mode Stratified charge combustion control at starting No stratified charge combustion at starting (cold start). D
Idle speed control Stops feedback control of idle speed and controls with specified speed. E
Recovery speed control at decelerating Stops recovery speed control by the fuel cut at decelerating and controls with specified speed.
Idle neutral control Stops idle neutral control.
Ignition timing correction control Partially controls ignition timing control. F
Retardation control Controls ignition timing delay control in the intermediate water temperature range.

Fail Safe List  x: Applicable, -: Not applicable

DTC No. Detected items Vehicle behavior
Pattern Others
A B C D E F
P0010 Electric intake valve timing control module - - x x - - ECM stops the electric valve timing control. (The camshaft returns to the position of most retard angle.)
- - x x x -
P0011, P0012, P052A, P052B Intake valve timing control - - x - - - ECM stops the electric valve timing control. (The camshaft returns to the position of most retard angle.)
NOTE: SYMBOL When VTC mechanism sticks, camshaft position does not change from position of stuck angle.
P0016 - - - - - -
P0014, P0015, P0017 Exhaust valve timing control - - x - - - -
P0078 Exhaust valve timing control solenoid valve - - x - - - -
P0101, P0102, P0103 Mass air flow sensor x x x x x x -
P0117, P0118 Engine coolant temperature sensor - - - x x - -
P0122, P0123, P0222, P0223, P2135 Throttle 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. So, the acceleration will be poor.
P0171, P0172 Fuel injection system function x - - x x - -
P0300, P0301, P0302, P0303, P0304 Misfire x - - x x - -
P0335 Crankshaft position sensor - - x x x - -
P0340, P0345 Intake camshaft position sensor - - x x - - -
- - x x x -
P0365 Exhaust camshaft position sensor - - x - - - -
P0500 Vehicle speed sensor x - - x x - -
P0603, P0607 ECM - - x - - - ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
ASCD operation may be deactivated.
P0605 ECM - - x - - - ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
- - - - - - -
P0606 ECM - - x - - - ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
- - - - - - -
P060A ECM - - x - - - ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
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.
  • ASCD operation may be deactivated.
P061B ECM - - x - - - ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
P0641 Sensor power supply - - x x - - ECM stops the electric valve timing control. (The camshaft returns to the position of most retard angle.)
- - x x x -
P0643 - - x - - - ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
P1805 Brake switch - - - - - - ECM controls the electric throttle control actuator by regulating the throttle opening to a small range. Therefore, acceleration will be poor.
Vehicle condition Driving condition
When engine is idling Normal
When accelerating Poor acceleration
P2004 Intake manifold runner control valve x x x x - - -
P2008 x x x x x x
P2014, P2015, P2016, P2017, P2018 - - 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 - - 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.
P2122, P2123, P2127, P2128, P2138 Accelerator pedal position sensor - - x - - - -
P2614, P2615 Intake camshaft position sensor (electric intake valve timing control signal) - - x x - - ECM stops the electric valve timing control. (The camshaft returns to the position of most retard angle.)
- - x x x -
P2616 - - x x - -
P2617, P2618 Crankshaft position sensor (electric intake valve timing control signal) - - x x - - ECM stops the electric valve timing control. (The camshaft returns to the position of most retard angle.)
P2619 - - x x x -
P25DF, P34AC, P34AD Electric intake valve timing control actuator - - x x - - ECM stops the electric valve timing control. (The camshaft returns to the position of most retard angle.)
NOTE: SYMBOL Normal bank transitions intermediate F/S valve timing.
P34C4 Electric intake valve timing control module - - x x - - ECM stops the electric valve timing control. (The camshaft returns to the position of most retard angle.)
P34C8 - - x x - - ECM stops the electric valve timing control. (The camshaft returns to the position of most retard angle.)
- - x x x -
U012E, U042F Engine communication - - x x - - ECM stops the electric valve timing control. (The camshaft returns to the position of most retard angle.)
- - x x x -
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