Thursday, 28 January 2016

Problems with the position lights in the Renault Megane II

Problems with the position lights in the Renault Megane II
In this post we discuss a typical failure in the lighting system of the Renault Megane II model (all engines).


A failure in the position lights on the right side prevents them working properly. There is a high probability that the respective fuse has blown and that after replacing it the problem persists.

If the error codes are read, no stored failure will be detected concerning this problem.


1-  Check fuse -F7A-, of 7.5 A of the Switching and Protection Unit, which manages the following elements:

Problems with the position lights in the Renault Megane II  
Right rear position lamps
Right front position lamps
Lighting of the speed control knob (if equipped with it).
Lighting of the ESP system control knob (if equipped with it).
Lighting of the sunroof control switch (if equipped with it).
Lighting of the heating button on driver and passenger seat (if equipped with it).
Lighting of gear display (automatic transmission).
2- Disconnect the right front and right rear pilot and operate the position light switch
. If fuse -F7A- does not blow, the problem will be in one of the two lamps, otherwise continue with the intervention plan.

Thursday, 21 January 2016

The Start-Stop system and the changes on power, charging and starting systems

start stop engine

The implementation of the Start-Stop system in many newly manufactured vehicles is causing major changes in power, charging and starting systems that should be known by mechanics in order to avoid problems when working on them.

The batteries used in today's cars, externally similar to traditional ones, may be technologically different, so that the way of checking, recharging and replacing them may be different. It should be remembered that the battery must be adapted on replacement, in compliance with the manufacturer's procedures both for recharging and for the connection of the jump start cables.

Due to the need for good control of the electrical power supply system, the use of current sensors located on the battery terminals (negative) is essential.
 This allows the current input and output of the battery to be recorded so its capacity can be determined at any time, this means there are no risks of starting problems when the Start-Stop system decides to switch off the engine when the vehicle is stationary. This sensor reports battery voltage, temperature and current flow.
The Start-Stop system and the changes on power, charging and starting systems
Power sensors housed in the battery terminal

Something similar happens with alternators. There are alternators found on the market that need to be stimulated to generate power, others will notify about their current level of power generation, and still others, called piloted, will receive the level of power to be generated from another control unit.
The Start-Stop system and the changes on power, charging and starting systems

Attempts are being made to reduce the size and weight of starter motors while increasing their reliability, as they must withstand a higher number of operating cycles.

Thursday, 14 January 2016

How does it work? Involuntary lane departure warning (LDW) system

This system, known generically as LDW (Lane Departure Warning System) is able to detect whether the vehicle has crossed a lane-dividing line unintentionally, alerting the driver so that he can correct the path.
Sistema de alerta de cambio involuntario de carril LDW

This steering assistance system is a new safety feature incorporated by different brands in some of their high and medium range models, allowing it to prevent an important number of accidents related to situations of fatigue, sleepiness or distraction while driving.

 How does it work?

Three different technologies are currently used to detect lane lines.

Infrared sensors: they are mounted at the bottom of the front bumper and among their advantages are simplicity and low system cost. Infrared light is projected onto the road and is reflected by the lane lines; this reflection allows the system to know when the vehicle is inside a lane.

Sensores infrarrojos en el sistema de alerta de cambio involuntario de carril LDW
Infrared sensors located at the bottom of the front bumper

Computer vision: A dynamic camera that continuously records and detects road markings is installed behind the windshield. These images are analysed and allow knowing in advance the correct path to be followed by the vehicle. If the path travelled differs from the correct path, the system can react before the lane is left.

Thursday, 7 January 2016

Fuel leak in Hyundai Matrix and Getz vehicles

In this post we discuss a common fault in the Common Rail Bosch type CP1 with 3 pistons pumps, used in 1.5 CRDi (D3EA) Hyundai Matrix and Getz engines. 
The fault in this case is the result of fuel leakage whose symptoms are defined below.

Hyundai Getz y Matrix

There is a smell of fuel in the engine area, including difficulty in starting once some time has elapsed since the engine was last stopped.


Verify the presence of fuel in the cylinder head plane below the high pressure pump.

The high pressure pump is located at the opposite end of the camshaft timing.
Bomba de alta presiĆ³n
High pressure pump

Detalle de las fugas alrededor del alojamiento de la bomba
Detail of leakage around the pump housing

Get a set of gaskets to make the repair. The gaskets of the high pressure pump should be replaced, but it is not necessary to replace the pump itself.

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