If after the above checks and adjustments there is no improvement in engine performance, you should contact a specialized Renault workshop to check the car. Specialists using a diagnostic tool connected to a special connector located under the center console ashtray, display information about any node of the injection system on the device screen. There are no combinations of fault codes during diagnostics, so it is impossible for the car owner to independently determine this or that malfunction.
If the indicator lights up in the instrument cluster while the vehicle is moving «Injection system malfunction» or it does not go out after 3 seconds after the ignition is turned on, this may indicate a defect in the following devices:
- pressure meter;
- throttle potentiometer;
- nozzles;
- idle speed controller;
- speed sensor;
- solenoid valve of the exhaust gas recirculation system;
- Automatic transmission.
Some units of the fuel injection system can be checked by measuring their parameters given in the subsection, however, the performance of a number of units cannot be assessed without special diagnostic equipment.
Experienced motorists with a tachometer and a gas analyzer can check the CO level in the exhaust gases at idle. However, if it turns out that these characteristics require adjustment, you will have to contact a specialist for further checks using specialized equipment. Neither the CO level nor the idle speed are adjustable. If they are incorrect, the injection system is faulty.
The content of toxic substances in the exhaust gases at the engine speed (750±50) min–1 and excess air coefficient 0.97 < l < 1.03
- CO* — no more than 0.5%
- CO2 - not less than 14.5%
- CH - no more than 100 p.m.
* At 2500 min-1 the CO content should not exceed 0.3%.
Checking the content of toxic substances is carried out at a coolant temperature above 80°C after stable operation of the engine with a speed of 2500 min–1 for approximately 30 s.