PCM [SKYACTIV-G 2.5T]

Function	Description
Main relay control	• Supplies power to each part by switching the main relay on/off at the optimal timing according to the vehicle conditions.
Drive-by-wire control	• To realize the driving required by the driver, the throttle valve actuator is controlled by electric signals and an optimum target throttle valve opening angle is calculated, and not by physically linking the accelerator pedal operation and throttle valve operation using a throttle cable. • The drive-by-wire control is composed of the idle air control, accelerator control, traction control, excess engine speed control, overspeed control, electric variable valve timing cooperation control, engine oil temperature control, ice break control, cruise control system, and the brake override system.
Boost control	• The PCM controls the boost pressure to improve the responsiveness of the turbocharger, the acceleration performance and fuel economy of the vehicle, and to reduce surge noise. • The PCM controls the following 3 valves to obtain optimum boost pressure according to the driving conditions. ― Wastegate valve actuator ― Air bypass valve ― Three way solenoid valve
Hydraulic variable valve timing control	• Changes the exhaust valve timing according to the engine operation conditions to improve the engine output, fuel economy, and emission performance. • Based on each input signal, the PCM determines the optimum exhaust valve timing according to the engine operation conditions, drives the OCV, and switches the oil passages of the hydraulic variable valve timing actuator to optimally control the exhaust valve timing. • Based on the coordination with the electric variable valve timing control and by increasing the amount of overlap during high engine loads, nitrogen oxide (NOx) occurring largely at high temperatures is reduced by re-circulating exhaust gas into the combustion chamber, which also reduces combustion temperature.
Electric variable valve timing control	• The PCM determines the optimum intake valve timing according to the engine operation conditions, and sends the motor drive signals to the electric variable valve timing driver. With the adoption of the electric drive system, variable intake valve timing can be controlled without any influence from the engine conditions, thus the fuel economy has been improved and pumping loss has been decreased. • Based on the coordination with the hydraulic variable valve timing control and by increasing the amount of overlap during high engine loads, nitrogen oxide (NOx) occurring largely at high temperatures is reduced by re-circulating exhaust gas into the combustion chamber which reduces combustion temperature.
Fuel injection control system	• Performs optimum fuel injection according to engine operation conditions. • The PCM determines the engine operation conditions based on the signals from each input device and drives the fuel injectors at the optimal fuel injection time (fuel injection amount) and the fuel injection timing to inject fuel. • Optimally controls combustion based on fuel injection amount, fuel injection timing, number of fuel injections, and the fuel pressure to achieve emission performance improvement and higher engine output.
Fuel pump control	• The PCM accurately controls the fuel pump discharge amount and fuel pressure while monitoring the fuel temperature/fuel pressure between the fuel pump unit and the high pressure fuel pump according to the engine operation conditions and the environment conditions to optimize power consumption by the fuel pump and improve fuel economy.
High pressure fuel pump control	• Changes the fuel pressure applied to the fuel injector to perform optimum fuel injection according the engine operation conditions. • The PCM determines the fuel pressure value corresponding to the engine operation conditions based on each input signal, and drives the spill valve control solenoid valve for optimum control of fuel pressure.
Electronic spark advance control	• Controls ignition for optimum timing (according to engine operation conditions). • Serviceability has been improved by eliminating the necessity of ignition timing adjustment. • The PCM determines the engine operation conditions (based on input signals from each sensor) and blocks current to the ignition coils at the calculated ignition timing. This causes the spark plugs to discharge (ignite) by the effect of electromagnetic mutual induction.
EGR control	• To recirculate an optimum amount of exhaust gas to the combustion chamber according to engine operation conditions, the PCM controls the EGR valve (stepping motor) to open and close the valve. • The intake gas temperature increases or decreases rapidly according to the exhaust gas temperature, and it affects the combustion temperature. To optimize the temperature of the recirculated exhaust gas, the opening and closing of the EGR valve are controlled according to the engine coolant temperature.
Purge control	• Controls the purge solenoid valve according to the engine operation conditions to introduce an appropriate amount of evaporative gas into the intake manifold and prevent release of evaporative gas into the atmosphere while assuring the drivability. • The PCM drives the purge solenoid valve based on the signal from each control part.
A/F sensor heater control	• Performs duty control of the heater according to the engine operation conditions (exhaust gas temperature) for A/F sensor protection and enhanced emission performance. • By controlling the A/F sensor heater, stable detection of oxygen concentration is possible even with low exhaust gas temperature, and feedback control for the fuel injection control is possible even after cold engine start, enhancing the emission performance under cold temperatures. • A pre-heat has been adopted to prevent water, (produced from the exhaust system when the engine is started), from adhering to the sensor and damaging it.
HO2S heater control	• Performs duty control of the heater according to the engine operation conditions (exhaust gas temperature) for HO2S heater protection and enhanced emission performance. • By controlling the HO2S heater, stable detection of oxygen concentration is possible even with low exhaust gas temperature, and feedback control for the fuel injection control is possible even after cold engine start, enhancing the emission performance under cold temperatures.
A/C cut-off control	• To improve drive performance and A/C compressor reliability, the A/C relay is turned off at the appropriate timing (according to the engine operation conditions), and the A/C operation is controlled.
Electrical fan control	• To improve engine reliability and cooling performance, operates the cooling fan according to the vehicle conditions and cools the radiator and condenser. • The PCM determines the engine operation conditions based on the signal from each sensor and performs duty-control of the fan control module to control the operation time and rotation speed of the cooling fan motor.
Starter cut-off control	• The PCM controls the excitation of the starter relay according to the request from the immobilizer system to improve security. • While not in P or N position, the starter relay energization by the push button start is inhibited.
Generator control	• To assure Idling stability, controls the generator output voltage to the optimum amount according to the engine operation and electrical load conditions. • The PCM determines the engine operation and electrical load conditions based on the input signals from each control part. It then uses this information to control the energization time of the generator field coils.
i-stop control	• When the vehicle is stopped such as at a stop light, the i-stop control stops/starts the engine automatically to improve fuel economy and reduce exhaust gas and idling noise. • The PCM determines whether to permit/inhibit i-stop control based on the signal from each input part and CAN communication. • The i-stop control includes the engine stop control, engine restart control, electric AT oil pump driver control, and vehicle roll prevention functions.
Engine oil variable control	• To reduce the oil pump operation load applied to the engine, the PCM adjusts the engine hydraulic pressure to the appropriate pressure according to the engine operation conditions. • The PCM performs duty control of the engine oil solenoid valve to variably adjust the engine oil discharged from the oil pump.

Function

Description

Main relay control

• Supplies power to each part by switching the main relay on/off at the optimal timing according to the vehicle conditions.

Drive-by-wire control

• To realize the driving required by the driver, the throttle valve actuator is controlled by electric signals and an optimum target throttle valve opening angle is calculated, and not by physically linking the accelerator pedal operation and throttle valve operation using a throttle cable.

• The drive-by-wire control is composed of the idle air control, accelerator control, traction control, excess engine speed control, overspeed control, electric variable valve timing cooperation control, engine oil temperature control, ice break control, cruise control system, and the brake override system.

Boost control

• The PCM controls the boost pressure to improve the responsiveness of the turbocharger, the acceleration performance and fuel economy of the vehicle, and to reduce surge noise.

• The PCM controls the following 3 valves to obtain optimum boost pressure according to the driving conditions.

― Wastegate valve actuator

― Air bypass valve

― Three way solenoid valve

Hydraulic variable valve timing control

• Changes the exhaust valve timing according to the engine operation conditions to improve the engine output, fuel economy, and emission performance.

• Based on each input signal, the PCM determines the optimum exhaust valve timing according to the engine operation conditions, drives the OCV, and switches the oil passages of the hydraulic variable valve timing actuator to optimally control the exhaust valve timing.

• Based on the coordination with the electric variable valve timing control and by increasing the amount of overlap during high engine loads, nitrogen oxide (NOx) occurring largely at high temperatures is reduced by re-circulating exhaust gas into the combustion chamber, which also reduces combustion temperature.

Electric variable valve timing control

• The PCM determines the optimum intake valve timing according to the engine operation conditions, and sends the motor drive signals to the electric variable valve timing driver. With the adoption of the electric drive system, variable intake valve timing can be controlled without any influence from the engine conditions, thus the fuel economy has been improved and pumping loss has been decreased.

• Based on the coordination with the hydraulic variable valve timing control and by increasing the amount of overlap during high engine loads, nitrogen oxide (NOx) occurring largely at high temperatures is reduced by re-circulating exhaust gas into the combustion chamber which reduces combustion temperature.

Fuel injection control system

• Performs optimum fuel injection according to engine operation conditions.

• The PCM determines the engine operation conditions based on the signals from each input device and drives the fuel injectors at the optimal fuel injection time (fuel injection amount) and the fuel injection timing to inject fuel.

• Optimally controls combustion based on fuel injection amount, fuel injection timing, number of fuel injections, and the fuel pressure to achieve emission performance improvement and higher engine output.

Fuel pump control

• The PCM accurately controls the fuel pump discharge amount and fuel pressure while monitoring the fuel temperature/fuel pressure between the fuel pump unit and the high pressure fuel pump according to the engine operation conditions and the environment conditions to optimize power consumption by the fuel pump and improve fuel economy.

High pressure fuel pump control

• Changes the fuel pressure applied to the fuel injector to perform optimum fuel injection according the engine operation conditions.

• The PCM determines the fuel pressure value corresponding to the engine operation conditions based on each input signal, and drives the spill valve control solenoid valve for optimum control of fuel pressure.

Electronic spark advance control

• Controls ignition for optimum timing (according to engine operation conditions).

• Serviceability has been improved by eliminating the necessity of ignition timing adjustment.

• The PCM determines the engine operation conditions (based on input signals from each sensor) and blocks current to the ignition coils at the calculated ignition timing. This causes the spark plugs to discharge (ignite) by the effect of electromagnetic mutual induction.

EGR control

• To recirculate an optimum amount of exhaust gas to the combustion chamber according to engine operation conditions, the PCM controls the EGR valve (stepping motor) to open and close the valve.

• The intake gas temperature increases or decreases rapidly according to the exhaust gas temperature, and it affects the combustion temperature. To optimize the temperature of the recirculated exhaust gas, the opening and closing of the EGR valve are controlled according to the engine coolant temperature.

Purge control

• Controls the purge solenoid valve according to the engine operation conditions to introduce an appropriate amount of evaporative gas into the intake manifold and prevent release of evaporative gas into the atmosphere while assuring the drivability.

• The PCM drives the purge solenoid valve based on the signal from each control part.

A/F sensor heater control

• Performs duty control of the heater according to the engine operation conditions (exhaust gas temperature) for A/F sensor protection and enhanced emission performance.

• By controlling the A/F sensor heater, stable detection of oxygen concentration is possible even with low exhaust gas temperature, and feedback control for the fuel injection control is possible even after cold engine start, enhancing the emission performance under cold temperatures.

• A pre-heat has been adopted to prevent water, (produced from the exhaust system when the engine is started), from adhering to the sensor and damaging it.

HO2S heater control

• Performs duty control of the heater according to the engine operation conditions (exhaust gas temperature) for HO2S heater protection and enhanced emission performance.

• By controlling the HO2S heater, stable detection of oxygen concentration is possible even with low exhaust gas temperature, and feedback control for the fuel injection control is possible even after cold engine start, enhancing the emission performance under cold temperatures.

A/C cut-off control

• To improve drive performance and A/C compressor reliability, the A/C relay is turned off at the appropriate timing (according to the engine operation conditions), and the A/C operation is controlled.

Electrical fan control

• To improve engine reliability and cooling performance, operates the cooling fan according to the vehicle conditions and cools the radiator and condenser.

• The PCM determines the engine operation conditions based on the signal from each sensor and performs duty-control of the fan control module to control the operation time and rotation speed of the cooling fan motor.

Starter cut-off control

• The PCM controls the excitation of the starter relay according to the request from the immobilizer system to improve security.

• While not in P or N position, the starter relay energization by the push button start is inhibited.

Generator control

• To assure Idling stability, controls the generator output voltage to the optimum amount according to the engine operation and electrical load conditions.

• The PCM determines the engine operation and electrical load conditions based on the input signals from each control part. It then uses this information to control the energization time of the generator field coils.

i-stop control

• When the vehicle is stopped such as at a stop light, the i-stop control stops/starts the engine automatically to improve fuel economy and reduce exhaust gas and idling noise.

• The PCM determines whether to permit/inhibit i-stop control based on the signal from each input part and CAN communication.

• The i-stop control includes the engine stop control, engine restart control, electric AT oil pump driver control, and vehicle roll prevention functions.

Engine oil variable control

• To reduce the oil pump operation load applied to the engine, the PCM adjusts the engine hydraulic pressure to the appropriate pressure according to the engine operation conditions.

• The PCM performs duty control of the engine oil solenoid valve to variably adjust the engine oil discharged from the oil pump.

Function	Page
Main relay control	(See MAIN RELAY CONTROL [SKYACTIV-G 2.5T].)
Drive-by-wire control	(See DRIVE-BY-WIRE CONTROL [SKYACTIV-G 2.5T].)
Boost control	(See BOOST CONTROL [SKYACTIV-G 2.5T].)
Hydraulic variable valve timing control	(See HYDRAULIC VARIABLE VALVE TIMING CONTROL [SKYACTIV-G 2.5T].)
Electric variable valve timing control	(See ELECTRIC VARIABLE VALVE TIMING CONTROL [SKYACTIV-G 2.5T].)
Fuel injection control system	(See FUEL INJECTION CONTROL SYSTEM [SKYACTIV-G 2.5T].)
Fuel pump control	(See FUEL PUMP CONTROL [SKYACTIV-G 2.5T].)
High pressure fuel pump control	(See HIGH PRESSURE FUEL PUMP CONTROL [SKYACTIV-G 2.5T].)
Electronic spark advance control	(See ELECTRONIC SPARK ADVANCE CONTROL [SKYACTIV-G 2.5T].)
EGR control	(See EGR CONTROL [SKYACTIV-G 2.5T].)
Purge control	(See PURGE CONTROL [SKYACTIV-G 2.5T].)
A/F sensor heater control	(See AIR FUEL RATIO (A/F) SENSOR HEATER CONTROL [SKYACTIV-G 2.5T].)
HO2S heater control	(See HEATED OXYGEN SENSOR (HO2S) HEATER CONTROL [SKYACTIV-G 2.5T].)
A/C cut-off control	(See A/C CUT-OFF CONTROL [SKYACTIV-G 2.5T].)
Electrical fan control	(See ELECTRICAL FAN CONTROL [SKYACTIV-G 2.5T].)
Starter cut-off control	(See STARTER CUT-OFF CONTROL [SKYACTIV-G 2.5T].)
Generator control	(See GENERATOR CONTROL [SKYACTIV-G 2.5T].)
i-stop control	(See i-stop CONTROL [SKYACTIV-G 2.5T].)
Engine oil variable control	(See ENGINE OIL VARIABLE CONTROL [SKYACTIV-G 2.5T].)

Function

Page

Main relay control

(See MAIN RELAY CONTROL [SKYACTIV-G 2.5T].)

Drive-by-wire control

(See DRIVE-BY-WIRE CONTROL [SKYACTIV-G 2.5T].)

Boost control

(See BOOST CONTROL [SKYACTIV-G 2.5T].)

Hydraulic variable valve timing control

(See HYDRAULIC VARIABLE VALVE TIMING CONTROL [SKYACTIV-G 2.5T].)

Electric variable valve timing control

(See ELECTRIC VARIABLE VALVE TIMING CONTROL [SKYACTIV-G 2.5T].)

Fuel injection control system

(See FUEL INJECTION CONTROL SYSTEM [SKYACTIV-G 2.5T].)

Fuel pump control

(See FUEL PUMP CONTROL [SKYACTIV-G 2.5T].)

High pressure fuel pump control

(See HIGH PRESSURE FUEL PUMP CONTROL [SKYACTIV-G 2.5T].)

Electronic spark advance control

(See ELECTRONIC SPARK ADVANCE CONTROL [SKYACTIV-G 2.5T].)

EGR control

(See EGR CONTROL [SKYACTIV-G 2.5T].)

Purge control

(See PURGE CONTROL [SKYACTIV-G 2.5T].)

A/F sensor heater control

(See AIR FUEL RATIO (A/F) SENSOR HEATER CONTROL [SKYACTIV-G 2.5T].)

HO2S heater control

(See HEATED OXYGEN SENSOR (HO2S) HEATER CONTROL [SKYACTIV-G 2.5T].)

A/C cut-off control

(See A/C CUT-OFF CONTROL [SKYACTIV-G 2.5T].)

Electrical fan control

(See ELECTRICAL FAN CONTROL [SKYACTIV-G 2.5T].)

Starter cut-off control

(See STARTER CUT-OFF CONTROL [SKYACTIV-G 2.5T].)

Generator control

(See GENERATOR CONTROL [SKYACTIV-G 2.5T].)

i-stop control

(See i-stop CONTROL [SKYACTIV-G 2.5T].)

Engine oil variable control

(See ENGINE OIL VARIABLE CONTROL [SKYACTIV-G 2.5T].)

DTC No.	Fail-safe function
P0130:00	• Fixes duty value of A/F sensor heater. • Stops fuel feedback control of A/F sensor.
P0601:00	• Restricts the upper limit of the engine speed. • Stops the drive-by-wire control (throttle valve is open at approx. 8° by return spring force).
P0604:00	• Restricts the upper limit of the engine speed. • Stops the drive-by-wire control (throttle valve is open at approx. 8° by return spring force).
P0606:00	• Restricts the upper limit of the engine speed. • Stops the drive-by-wire control (throttle valve is open at approx. 8° by return spring force).
P061B:00	• Restricts the upper limit of the engine speed.
P061D:00	• Restricts the upper limit of the engine speed.
P2107:00	• Restricts the upper limit of the engine speed. • Stops the drive-by-wire control (throttle valve is open at approx. 8° by return spring force).
P2110:00	• Restricts the upper limit of the engine speed. • Stops the drive-by-wire control (throttle valve is open at approx. 8° by return spring force).

DTC No.

Fail-safe function

P0130:00

• Fixes duty value of A/F sensor heater.

• Stops fuel feedback control of A/F sensor.

P0601:00