Why did the Volvo ETM fail in 1999?

Why did the Volvo ETM fail in 1999?

Volvo’s 1999-2002 ETM fails because there is physical contact between two small parts that results in wear, then damage, then failure. Artistic style applied to a line drawing of the problematic ETM. Here’s our VRD posts tagged “ETM”.

When did Volvo switch to electronic throttle module?

Volvos affected by the electronic throttle module (“ETM”) are 1999-2002 models (US model years). Before 1999, Volvo used a good old mechanical set of parts to control the throttle. In 1999, they switched to a “fly-by-wire” module… this problematic ETM. This design affects almost a half-million Volvo gasoline cars.

Why does Volvo ETM switch to limp home mode?

The fundamental flaw with this design is that the carbon layer’s chemical composition is not strong enough to withstand continuous wiper friction. As a result, the wiper scrapes off the carbon run right down to the substrate, creating an open circuit which causes the ETM to switch to limp-home mode.

Can a car upshift if the ETM is failing?

You can upshift and chances are that the throttle will not fail again at that point – though you’re now on borrowed time, and a complete failure can happen at any time. Once the throttle has reached this point, hunting at idle will be very common, even with the engine cold, and the car may also be hard to start.

What are the symptoms of a failing idle air control valve?

Symptoms of a failing idle air control valve. A faulty idle air control (IAC) valve can cause a number of problems with your vehicle: 1. Incorrect idle speed: An IAC valve that sticks in the closed position will create an idle speed that’s too low. Your RPMs will drop way down the car may feel like it’s about to stall.

How can I tell if my Volvo transmission is bad?

Volvo first starts to manifest transmission problems by hesitating to engage or take too long to change gear. As the problem gets worse, you will notice a bang or hard shifting between gear. If you ignore the problem for too long, the car will go into Limp Mode and get stuck in one gear.

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