Specifications of the injection system of gasoline engines Technical characteristics of the injection system of gasoline engines K4M and F4P Checks performed with the engine idling Specifications of the L7X petrol injection system Checks performed with engine idling**
Elements of the injection system of engines K4M and F4P 1 - absorber purge solenoid valve; 5 - ignition coils; 10 - air temperature sensor 2 - absolute pressure sensor: 12 - solenoid valve of the camshaft dephaser (only on F4P engine). 3 - throttle valve block with servo...
Elements of the injection system of L7X engines 3 - upper oxygen sensor (rear cylinders); 4 - absolute pressure sensor; 6 - lower oxygen sensor (rear cylinders); 7 - throttle valve with servo; 11 - coolant temperature sensor 13 - lower oxygen sensor (front...
Features of the SAGEM multipoint injection system «S2000» The SAGEM 112-pin S2000 ECU manages the injection and ignition systems and has multipoint sequential injection (F4P engines). On the camshaft there is no sensor B MT of the piston of the first cylinder, therefore,...
Features of the BOSCH multipoint injection system The 128-pin 8OSCH-ME 7.4 6 ECU controls the injection system of the L7X engine. Injection is carried out sequentially in accordance with the order of operation of the cylinders (1-6-3-5-2-4). Ignition system with static...
Motorized Throttle Valve (K4M and F4P) The servo-driven throttle valve control idling and air filling of the engine cylinders. It consists of an electric motor and a potentiometric throttle position sensor with two conductive tracks. At idle, the throttle...
Motorized Throttle Valve (L7X) The servo-driven throttle valve unit controls the idle speed and air filling of the feeder cylinders. It consists of an electric motor and a potentiometric throttle position sensor with two conductive tracks. Throttle...
Idle speed correction depending on the coolant temperature (K4M and F4P) Idle speed correction depending on the battery voltage and on the balance of electrical energy The engine idle speed correction compensates for the voltage drop when the consumer of electricity is turned on, if the...
Idle speed correction depending on the coolant temperature (L7X) Idle speed correction depending on the battery voltage and on the balance of electrical energy The engine idle speed correction compensates for the voltage drop when the electrical consumer is switched on if the battery...
Adaptive engine idle speed correction (K4M and F4P) There is adaptive idle speed correction, but the scan tool does not reflect this feature. Under normal warm engine operating conditions, the idle open cycle ratio changes from high to low to achieve rated idle speed. It...
Regulation of the composition of the working mixture (K4M and F4P) Engine with ECU «SAGEM S 2000» equipped with two oxygen sensors: upper and lower. Heated sensors Heated oxygen sensors are switched on by the command of the ECU under the following conditions: the intake pressure is...
Regulation of the composition of the working mixture (L7X) Note. Engine with ECU «BOSCH ME 7.4.6 is equipped with two oxygen sensors for each row of cylinders: upper and lower. Heated sensors Heated oxygen sensors are switched on by the ECU command if: battery voltage below 15...
Adaptive correction of the composition of the working mixture (L7X) With closed control loop, during mixture control (PR 35) the injection duration is adjusted to get the dosage as close as possible to mixture ratio 1. The correction value is close to 1. and the extreme values are 0.75...
Centralized coolant temperature control (K4M and F4P) The engine cooling fan is controlled by the injection computer. Overheat prevention function The overheat prevention system is controlled by the injection computer. Information about the coolant temperature comes from...
Centralized coolant temperature control (L7X) The engine cooling fan is controlled by the injection computer. Overheat prevention function The overheat prevention system is controlled by the injection computer. Information about the coolant temperature comes from...
Camshaft Phase Control (F4P) The phase regulator 1 of the camshaft is located on the intake camshaft. The phase regulator is designed to change the valve timing. It's managed (based on yes or no») Injection control unit with solenoid valve 2...
Camshaft Phase Control (L7X) A camshaft phaser is located on each intake camshaft. Phase regulators are designed to change the valve timing. They are managed (according to principle «Not really») Injection control unit with two solenoid valves...
Regulator and speed limiter (K4M and F4P) General information Speed control: allows you to maintain the speed selected by the driver. This feature can be disabled at any time by depressing the brake pedal (clutch pedals on cars with manual gearbox) or one of...
Regulator and speed limiter (L7X) General information Speed control: allows you to maintain the speed selected by the driver. This feature can be disabled at any time by depressing the brake pedal, (manual transmission clutch) or one of the system...
Features of the on-board diagnostics system (all engines) This vehicle is equipped with an on-board diagnostic system, which is characterized by the following features. If a malfunction is detected that leads to excessive emissions of toxic substances, a warning lamp lights up...
Conditions for Switching on the On-Board Diagnostic Warning Light Electrical faults The signal lamp lights up with a constant light after detecting a malfunction of the same device several times in a row. Number of mixture misfires damaging the catalytic converter The signal lamp...
Conditions for the diagnosis «OBD» (L7X) Conditions for the diagnosis For the OBD system to function correctly, there must be no electrical faults in the injection system, even if the OBD warning light does not come on. When diagnosing the catalytic converter...
Diagnostics of omissions of ignition of the mixture (K4M and F4P) Misfires of the mixture are recorded in order to identify malfunctions that lead to an excess of the exhaust gas toxicity threshold allowed by the on-board diagnostics system, which entails the failure of the catalytic...
Diagnostics of omissions of ignition of the mixture (L7X) Misfire mixtures are recorded in order to detect malfunctions that lead to an excess of the exhaust gas toxicity threshold allowed by the on-board diagnostics system, which entails the destruction of the catalytic...
Catalytic Converter Diagnostics (K4M and F4P) Catalytic converter diagnostics are performed to identify a malfunction that causes the exhaust gas toxicity threshold to be exceeded by the on-board diagnostic system. An indicator of the condition of a catalytic...
Catalytic Converter Diagnostics (L7X) Catalytic converter diagnostics are performed 8 to identify a malfunction that causes the exhaust gas toxicity threshold to be exceeded by the on-board diagnostic system. An indicator of the condition of a catalytic...
Oxygen Sensor Diagnosis (K4M and F4P) Catalytic converter diagnostics are performed in order to identify a malfunction that leads to an excess of the exhaust gas toxicity threshold, allowed by the on-board diagnostic system. It is performed by measuring and...
Oxygen Sensor Diagnosis (L7X) Catalytic converter diagnostics are performed to identify a malfunction that causes the on-board diagnostics system to exceed the threshold for toxic emissions of hydrocarbon oxides of carbon and nitrogen. Diagnosis is...
Assignment of the contacts of the injection computer (K4M and F4P) Connector A H2 - accelerator pedal position sensor signal (conductive track 1). NZ - «weight» accelerator pedal position sensor (conductive track 1). H4 - «weight» power circuit. G2 - power supply of the accelerator...
Assignment of the contacts of the injection computer (L7X) Connector A AZ - power supply of the absolute pressure sensor. 82 - power supply for the controls of the regulator and speed limiter. 83 - absolute pressure sensor signal. NW - «weight» absolute pressure sensor. C4 -...
Diagnostics of the petrol engine injection system (Motronic ME 7.4.6) System description The system includes: ECU Bosch ME 7.4.6; servo throttle valve (EGAS: Electronic control system for filling engine cylinders with air); adsorber; adsorber purge solenoid valve; absolute pressure...
Troubleshooting algorithm No communication with ECU Test the scan tool on another vehicle. Check; communication between the diagnostic tool and the diagnostic socket of the vehicle (good wiring condition); fuses protecting the circuits of the...
Removing and installing the accelerator pedal position sensor The sensor is rigidly connected to the accelerator pedal. To replace it, you need to replace the accelerator pedal. There are two types of pedals: with or without a switch. Vehicles equipped with cruise control/speed...
Removing and installing the fuel injection computer The injection computer is located under the battery tray. To remove the unit, it is necessary to remove the battery shelf, which is fixed with three non-removable bolts. Removing Disconnect and remove the battery....