Renault Clio II expression- electronic light comes up and car stops !

[Mara]

Hello!

I wonder if anyone knows anything about our problem.

The car basically works ok whilst being driven but when about to stop for any reason (example:traffic lights), power drops, electronic fault light comes on and car stops completely. As soon as it gets restarted, it works ok whilst being driven but same problem occurs the next time it is about to reduce speed to stop.

When initially plagued in, the indicated problem was map sensor. Map sensor was changed and problem still occurred. We took the car to Renault dealer for diagnostic, and the same codes came up (to replace map sensor). We explained that this sensor was already changed but Renault refused to check anything else since these codes came up. We took the car back to our local engineer and changed once again the map sensor in case it was faulty. Unfortunately, the problem still persists.

Any idea what this might be? Is it worth fixing this problem - anyone had anything similar?

Please advise! Thanks,
Mara

	MAP Sensor Map Sensor A MAP sensor (manifold absolute pressure) is one of the sensors used in an internal combustion engine's electronic control system. Engines that use a MAP sensor are typically fuel injected. The manifold absolute pressure sensor provides instantaneous pressure information to the engine's electronic control unit (ECU). This is necessary to calculate air density and determine the engine's air mass flow rate, which in turn is used to calculate the appropriate fuel flow. (See stoichiometry.) An engine control system that uses manifold absolute pressure to calculate air mass, is using the speed-density method. Engine speed (RPM) and air temperature are also necessary to complete the speed-density calculation. Not all fuel injected engines use a MAP sensor to infer mass air flow, some use a MAF sensor (mass air flow).

[hondo]

Hello Mara, Welcome.

I've moved your post over to the Electronics section

[Lagdti]

Hello and welcome to the forum.

Which engine has your Clio got?.

[Mara]

Hello!!

1.2 16V Expression - it is!

[Lagdti]

OK,as you have a reoccuring MAP sensor fault logged then depending on exactly what that code is it could be a couple of things.

The ECU plugs are 'protected' by two metal brackets,these brackets come close and then eat through the wiring loom (mmm....great protection then!).It is possible that they have damaged the wiring to the MAP sensor,or even to another component which effects the sensor.General corrosion inside of the wiring loom is common too,this can make finding faults even more difficult.

The second problem is the throttle body,another pretty common fault.These can be tested and repaired by a company called BBA Reman (Google them for more details).

I would try and find a good engine management specialist/auto-electrician to go through the wiring and go from there.The main problem is that as soon as a 'MAP Sensor code' comes up on a diagnostic check the component is instantly changed even though the wiring to it could be the cause of the fault,it's an easy trap to fall into to be honest but once one new sensor was fitted and this didn't cure the problem a closer look into the problem should have been made.

	ECU Electronic Control Unit In automotive electronics, an electronic control unit (ECU) is an embedded system that controls one or more of the electrical subsystems in a vehicle. Some modern cars have up to 70 ECUs.

	MAP Sensor Map Sensor A MAP sensor (manifold absolute pressure) is one of the sensors used in an internal combustion engine's electronic control system. Engines that use a MAP sensor are typically fuel injected. The manifold absolute pressure sensor provides instantaneous pressure information to the engine's electronic control unit (ECU). This is necessary to calculate air density and determine the engine's air mass flow rate, which in turn is used to calculate the appropriate fuel flow. (See stoichiometry.) An engine control system that uses manifold absolute pressure to calculate air mass, is using the speed-density method. Engine speed (RPM) and air temperature are also necessary to complete the speed-density calculation. Not all fuel injected engines use a MAP sensor to infer mass air flow, some use a MAF sensor (mass air flow).

	Throttle Body Throttle Body In a fuel injection engine, the throttle body is the part of the air intake system that controls the amount of air flowing into the engine, in response to driver input. While the accelerator is often called a "gas pedal", it would be more accurate to describe it as an "air pedal". The throttle body is usually located between the air filter box and the intake manifold, and usually attached to, or near, the mass airflow sensor. The largest piece inside the throttle body is the throttle plate, which is a butterfly valve that regulates the airflow.