Functional Operation

When the main sensor functions are detected by the on-board diagnostics, the vehicle is controlled by means of the following defaults.

VOLUME AIR FLOW SENSOR
- Uses the Throttle Position Sensor (TPS) signal and engine speed signal (crankshaft position sensor signal) to read the injector basic drive time and basic ignition timing from the preset map.
- Fixes the Idle Air Control (IAC) motor in the appointed position so the idle air control is not performed.

INTAKE AIR TEMPERATURE SENSOR
- Controls as if the intake air temperature is 25°C (77°F).

THROTTLE POSITION SENSOR (TPS)
- No increase in fuel injection amount during acceleration due to the unreliable throttle position signal.

ENGINE COOLANT TEMPERATURE SENSOR
- Controls as if the coolant temperature is 80°C (176°F).

CAMSHAFT POSITION SENSOR
- Injects fuel into the cylinders in the order 1-3-4-2 with regular timing. (After the ignition switch is turned to ON, the No. 1 cylinder top dead center position is not detected at all.)

BAROMETRIC PRESSURE SENSOR
- Controls as if the barometric pressure is 101 kPa (170 mm Hg, 30 in. Hg) (sea level).

IAC VALVE POSITION SENSOR
- Idle air control is not performed.

HEATED OXYGEN SENSOR (FRONT)
- Air/Fuel ratio closed loop control is not performed.

HEATED OXYGEN SENSOR (REAR)
- Performs the closed loop control of the air/fuel ratio by using only the signal of the heated oxygen sensor (front) installed on the front side of the catalytic converter.

MISFIRE DETECTION
- The Engine Control Module (ECM) stops supplying fuel to the cylinder with the highest misfiring rate if a misfiring that could damage the catalytic converter is detected.