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...

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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...
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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...

The rear torsion bars are normally best left to a garage to adjust them, but if you're confident in your abilities and you can obtain the correct tools for the job, this is a modification that you CAN do yourself! Please be aware that this is quite a tricky task to undertake and that your actions could lead to malfunction of your rear...

If you'd like to lower the front suspension of your Saxo, this can be done in a number of ways. By far the cheapest option is to fit a pair of uprated, shorter springs. It is important to realise that the springs you will purchase are not simply shorter, the spring damping rate is also increased to compensate for the shorter spring length. On...
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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...