Your automatic transmission is as important and as expensive to replace as your engine, so don’t leave it until it’s too late. Some switches are adjusted by screwing them into or out of their mounting.Auto Transmission Services & Specialists in Joondalup Using a test lamp check that there is a power supply to the inhibitor switch when the starter is being operated - you will need someone to help with this. Common positions for the inhibitor switch are on the transmission housing (close to the selector lever) at the end of the cable-operated control linkages (in front-wheel-drive cars) and by the side of the control handle inside the car. If the starter will operate in any position other than 'park' and 'neutral', the linkage needs adjusting. However, before you check the switch, try to start the engine in all the control lever positions because the problem could lie with the control linkage. Failure of the switch, or the associated wiring, will mean that you will not be able to operate the Which lets you start the engine only when the transmission is in the 'neutral' or 'park' positions - often the switch includes an additional set of contacts for the reversing lights. Most automatic transmissions are fitted with an Dark brown discoloration shows that the fluid has been overheated, while the presence of black specks points to heavy wear of the internal clutches and brake bands and an internal investigation will probably be needed - especially if your other tests show the transmission is not working properly. Hot fluid is thinner and will have a less pronounced colour but the two samples should appear much the same. To obtain a sample of the fluid from the transmission, again smearing it on paper. Put a smear of fresh fluid on some white kitchen paper to give a comparison and then use the The condition of the transmission fluid can often provide a useful guide to transmission condition. If the level is all right, you should check the fluid condition. Any drips will show up on the paper and their position will give you a good idea where the fluid is coming from. Start the engine and operate the transmissionĪ couple of times. Try standing the car over some newspaper laid out on the A need for frequent topping up shows that there is a leak somewhere in the transmission which should be traced and put right as soon as possible. To find outĮxactly where the problem lies, you will need to do the tests shown in theįirst check the fluid level. A high stall speed points to a problem with the fluid supply to theĬonvertor, or to an internal fault in the rest of the transmission.
Significantly lower reading (say 500rpm down) shows that there is a convertorįault. A reading justīelow the specified value means that the engine is probably out of tune, but a Not hold the transmission in the stalled condition for more than ten seconds orĬompare the measured stall speed to the specified value. Release the accelerator and return the selector to neutral. Using an accurate rev counter, make a note of that engine speed (called the Pedal so that the engine revs up - keep it going until the revs Up apply the footbrake firmly, select the lowest gear and fully depress the With the engine running and both the engine and transmission properly warmed
Auto transmission manual#
Find out from your manual (or your dealer) if youĬan do the test, and also what is the specified You need to do a test to discover whether the problem is in the gearbox, theĪ general lack of performance with poor acceleration and bad hill startingĬan be due to a fault in the torque convertor.
Incorrect fluid level (see sideline, opposite). By far the most common cause of trouble with an automatic gearbox is
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