Power Window Diagnosis and Methodology

Power Window Switch

Power Windows problems are usually caused by oxidation in the joints as do many electrical connects but shorting to ground is also common. A basic understanding of the circuitry is important and the best approach is using a test pen to pin point by back probing the connectors with the ign on , the ground pins and the live pins.
Test pen can be used to test ground or live as follows:

Brake Bleeding

 

Brake Wheel Cylinder

Brake bleeding must be performed whenever the brake pedal felt 'spongy' or any brake components are replaced, for example, brake shoes, brake pads, brake calliper pistons, brake wheel cylinders or every 50,000 km or 5 years or more.  Vehicles that are 5 years or more will have brake fluid heavily contaminated and the water absorbed in the brake fluid will corrode the brake wheel cylinders, the brake piston chambers etc.. Brake bleeding at the rear wheels normally will show a highly contaminated brown fluid oozing out of the brake nipple.

ISC check cleaning and replacement

Of Mitsubishi variant, the ISC (Idle Speed Control) servo valve need to be cleaned especially the secondary gear support shaft. This support shaft is basically a hollow sleeve that accepts the secondary gear which will turn according to the engine load demand by opening the bypass air passage from below the throttle body to allow more air into the throttle body which will raise the rpm especially during idling  where the vacuum is greatest. These transfer gear may crack as they are made of plastic and if true will need to be replaced.

C22 Vac Hose connections at Air Cleaner end



C22 Vac Hoses

Convoluted as it seems , but prior to removing the C22 carburettor cover, it is prudent to remember all the hose connections before doing so as the various components connected require the right vac to perform properly. For fuel emission control purposes, the EGR connection on the left is crucial which essentially recirculates the exhaust gas back to the base of the Carb to reduce oxides of nitrogen. The other vac hose connected to the Carb body (upper side) which goes half round the top of the cylinder head cover is connected to the distributor Vac advance mechanism. Make sure this line display vacuum when the engine is running as this enables ignition to advance as the engine gathers speed.

Auto Trans Pressure Test Table

Proper testing of the pressure at various points in the Auto Transmission Unit can reveal a lot about the condition of the AT box. A simple yet effective prognosis for instance could be the popular disconnection of the oil cooler hose and check if the ATF fluid oozes out when the Auto Box is in motion as proof of the working status of the TC (torque converter)  but more often there is more than that.