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...
Overview
The Bosch ME7.4.4 and M7.4.4 ignition-injection ECUs have been developed to control the following functions:
• engine torque,
• sequential multipoint injection,
• twin static ignition,
• cruise control (optional),
• L4 (EOBD)*/K'/ifL5 depollution standards,
• engine cooling,
• dialogue with the other ECUs on the CAN... 1 Comments
The ECU is responsible for controlling the "coolant temperature warning" LED when the temperature reaches a critical level (risk of damaging the engine).
To perform this function, a coolant temperature thermocontact switch is used. This is mounted directly into the engine block as it can be more reactive in the event of loss of coolant.
The...
The coolant temperature sensor has two functions:
• it informs the ECU of the coolant temperature in the cooling circuit and therefore the temperature of the engine,
• it transmits the coolant temperature information to the temperature gauge on the control panel for non multiplexed vehicles.
The ECU uses the coolant temperature...
Electronic immobiliser ignition key
The Saxo electronic immobiliser device locks the engine management system as soon as the key is removed from the ignition, making the car immobilised. For all Saxo models, which do not use a keypad immobiliser (only early Mk1 Saxos have keypad) the ignition key contains an electronic component which ensures...
