PGM-FI System
The programmed fuel injection (PGM-FI) system is a sequential multiport fuel injection system.
Alternator Control
The alternator signals the ECM/PCM during charging.
Air Conditioning (A/C) Compressor Clutch Relay
When the ECM/PCM receives a demand for cooling from the A/C system, it delays the compressor from being energized, and enriches the mixture to assure smooth transition to the A/C mode.
Air Fuel Ratio (A/F) Sensor
The A/F sensor operates over a wide air/fuel range. The A/F sensor is installed upstream of the warm up three way catalytic converter (WU-TWC), and sends signals to the ECM/PCM which varies the duration of fuel injection accordingly.
Barometric Pressure (BARO) Sensor
The BARO sensor is inside the ECM/PCM. It converts atmospheric pressure into a voltage signal that modifies the basic duration of the fuel injection discharge.
Camshaft Position (CMP) Sensor B
CMP sensor B detects the position of the No. 1 cylinder as a reference for sequential fuel injection to each cylinder.
Clutch Switch (SIL) (KE, KG, KR models (M/T))
The clutch switch (SIL) signals the ECM when the clutch switch pedal is pressed. When the clutch switch (SIL) is ON, the ECM turns on shift indicator lamp (SIL) via the F-CAN.
Crankshaft Position (CKP) Sensor
The CKP sensor detects crankshaft speed and is used by the ECM/PCM to determine ignition timing, timing for the fuel injection of each cylinder, and engine misfire detection.
Engine Coolant Temperature (ECT) Sensors 1 and 2
ECT sensors 1 and 2 are temperature dependent resistors (thermistors). The resistance decreases as the engine coolant temperature increases.
Engine Oil Level Sensor (Except KQ model)
This sensor detects engine oil level.
Ignition Timing Control
The ECM/PCM contains the memory for basic ignition timing at various engine speeds and manifold absolute pressures. It also adjusts the timing according to engine coolant temperature and intake air temperature.
Injector Timing and Duration
The ECM/PCM contains the memory for basic discharge duration at various engine speeds and manifold pressures. The basic discharge duration, after being read out from the memory, is further modified by signals sent from various sensors to obtain the final discharge duration.
By monitoring long term fuel trim, the ECM/PCM can detest long term malfunctions in the fuel system and set DTCs (diagnostic trouble codes) if needed.
Knock Sensor
The knock control system adjusts the ignition timing to minimize knock.
Manifold Absolute Pressure (MAP) Sensor
The MAP sensor converts manifold absolute pressures into electrical signals to the ECM/PCM.
Mass Air Flow (MAF) Sensor/Intake Air Temperature (IAT) Sensor
The mass air flow (MAF) sensor/intake air temperature (IAT) sensor contains a hot wire, cold wire sensor and a thermistor. It is located in the intake air passage. The resistance of the hot wire, cold wire sensor and thermistor changes due to intake air temperature and air flow. The control circuit in the MAF sensor controls the current to keep the hot wire at a set temperature. The current is converted to voltage in the control circuit, then output to the ECM/PCM.
Output Shaft (Countershaft) Speed Sensor
This sensor detects countershaft speed.
Secondary Heated Oxygen Sensor (Secondary HO2S)
The secondary HO2S detects the oxygen content in the exhaust gas downstream of the warm up three way catalytic converter (WU-TWC), and sends signals to the ECM/PCM which varies the duration of fuel injection accordingly. To stabilize its output, the sensor has an internal heater. The ECM/PCM compares the HO2S output with the A/F sensor output to determine catalyst efficiency. The secondary HO2S is installed downstream WU-TWC.
Shift Indicator Lamp (SIL) (KE, KG, KR models (M/T))
The shift indicator lamp (SIL) indicates optimal gear shift position in optimal shift timing for better actual fuel consumption.
When prompting to one-gear shift up, shift up indicator lamp illuminate on.
When prompting to one-gear shift down, shift down indicator lamp illuminate on.
Keep engine speed low to improve fuel economy
More acceleration, SIL prompt to shift down to prevent excessive footing on acceleration pedal
Hill climbing, pulling or accelerating, SIL delays shift up prompt to prevent excessive footing on acceleration pedal