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Bumpr sag e46 m3
Bumpr sag e46 m3








bumpr sag e46 m3

When the pump fails and the aforementioned fuse is blown, the on-board computers that monitor and control the pump are no longer able to communicate with it and have no way to “know” what gear the vehicle is in. How does a failed SMG pump cause the car to not start? Left: Blown 40 Amp SMG pump fuse, Right: SMG pump 40 Amp fuse location on a 2003 (E46) BMW M3

bumpr sag e46 m3

The SMG pump (pictured below) is similar to an ABS pump in both appearance and function, but controls the hydraulic pressures in the transmission and not the brake system. When the M3 arrived at the shop, we hooked it up to our computer diagnostics scan tool and found a DTC, or “diagnostic trouble code, “ indicating a fault with the Park/Neutral solenoid, which is an integrated component on the SMG hydraulic pump assembly.

#Bumpr sag e46 m3 how to#

Symptoms and Diagnosis: How to know when an SMG pump has failed and needs to be replaced. Instead, the clutch is controlled electronically by a computer and actuated by hydraulics. You still change gear much like you would in a conventional standard by using a “stick” of sorts (or by paddles mounted just behind the steering wheel), but there is no clutch pedal. Just to clarify for those who aren’t familiar with BMW’s SMG transmission, the simplest way to explain it is that it’s neither a conventional “manual” nor “automatic” transmission, but more like a combination of the two. There are many more common causes for a no start – like a dead battery, worn out starter, faulty brake pedal switch, etc.- and after checking the usual suspects and not finding the problem, he had the car towed over to our shop. When our customer got into his E46 M3 recently and found that it wouldn’t start, a transmission problem was the last thing he suspected to be the culprit.










Bumpr sag e46 m3