The throttle potentiometer is located on the throttle housing. Supplied with +5 V by the ECU, this potentiometer transmits a variable voltage to the ECU which is a function of the position of the throttle (driver's wishes). This information is used for recognising no load and full load positions and transitories for acceleration,...

The main supply to the system is by means of a double relay, which provides 3 operating states: • ignition off: − the power to some system components such as: . the injectors, . the ignition coil, . the fuel pump, . the canister bleed electrovalve, . the oxygen sensor heating resistors, . the air pump relay (specific to ifL5 depollution),...

The engine speed sensor consists of a magnetic core and a winding. It is positioned opposite a ring on the flywheel with 60 teeth, 2 of which have been removed in order to determine the TDC (top dead centre) position. When the teeth of the flywheel pass in front of the sensor, a variation in magnetic field is created. This variation...

The injectors are of twin jet type. They are supplied with +12 V via the double multifunction relay. The ECU controls the injectors separately by earthing them in the firing order 1-3-4-2 when the inlet valves are closed. The amount of fuel injected depends on the injector opening time (called the injection time). Pulses from the...

The ignition is of twin static type: BBC2.2 (Compact Coil Unit and no HT leads). The compact coil unit consists of 2 coils with 2 HT outputs. It is located directly above the spark plugs. Each coil consists of a primary winding linked to a secondary winding. Each secondary output is connected to a spark plug. This technology improves ignition...

Overview The piezo-electric type knock sensor / pinking sensor is mounted on the rear of the engine block. This sensor is used to detect knock (vibrations caused by the mixture detonating in the combustion chamber), often caused by pre-ignition. This phenomenon, if repeated, can destroy mechanical parts due to an abnormal rise in temperature...

Overview The inlet air pressure sensor is a new generation sensor and incorporates the inlet air temperature sensor. The inlet air pressure sensor constantly measures the pressure in the inlet manifold as well as the temperature of the engine inlet air. It is supplied with +5V by the ECU when the ignition is switched on. Inlet air...

Overview The idle regulation stepper motor is mounted on the end of the inlet manifold or on the throttle housing; it is controlled electrically by the ECU. This stepper motor controls an air flow taken in parallel to the throttle with the aim of: • providing an additional air flow (cold starting), • regulating an idle speed as a function of...

Overview The downstream oxygen sensor is used to comply with the EOBD regulations (European On Board Diagnosis) which applied to Saxos from 2001 onwards. It is located after the catalytic converter and it is used to check the efficiency of the catalytic converter. The specifications and heating device of the downstream oxygen sensor are the...

This sensor is mounted on the exhaust manifold, at the inlet to the catalytic converter and permanently supplies a voltage to the ECU representing the oxygen content of the exhaust gases. It has a green 4 way connector. Two of these four connector pins supply current to the sensor's internal heater. The other two provide a voltage from the sensor...