What is a DME relay for a Porsche?
What is a DME relay for a Porsche?
The DME relay is actually two relays in one. One relay controls the car’s DME [computer] and the other controls the fuel pump. The purpose of this relay is to prevent the fuel pump from continuing to operate in the event of an accident.
Where is the DME relay on a Porsche 911?
On the 84 to 89 911s, the DME relay is located under the left front seat directly adjacent to the DME box. On the 90 and up 911s, it is mounted in the fuse box. Contained within the relay are actually two relays which operate in sequence of the other.
What is a DME sensor?
The DME sensors detect all elements and factors affecting the engine’s operation. The captured data is then evaluated and translated into commands for the ignition and fuel injection systems.
What is DME main relay?
The DME main relay, the primary power source for nearly all engine management functions, supplies battery power to the engine ECM when the ignition is activated. A faulty DME relay can cause poor engine performance and hard starting problems. When it fails completely you may be left with an engine that doesn’t start.
Which faulty ignition component can result in a no start condition?
Car not starting: Another symptom of a faulty ignition relay is a no power condition. If the relay fails it will cut off power to fuel pump and ignition system, which will result in a no power, and therefore no start condition.
Where is the DME relay on a Porsche 944?
On the older 944s, the relay is known as the fuel pump relay and is located on the fuse panel under the dash on the driver side. On later 944s and 951s, the relay is located in the fuse /relay panel in the rear left side of the engine compartment close to the windshield and A-pillar.
Where is the DME on a Porsche 944?
The DME relay which is used on 1985.5 and newer 944s is essentially the same as the fuel pump relay used on early 944s. The fuel pump relay on the early cars is located on the fuse / relay panel under the dash on the driver’s side (LHD). The DME relay actually has two relays / contacts.
Is DME same as ECU?
In the automotive industry, DME is often referred to as the Engine Control Unit (ECU), under the heading of Electronic Engine Management Systems. DME operates by continually monitoring such factors as engine temperature, speed, intake airflow, exhaust gas composition, and even altitude.
How do you know if your ignition relay is bad?
Usually a bad or failing ignition relay will produce a few symptoms that can notify the driver of a potential issue.
- Car suddenly stalls while operating. One of the most common symptoms of a failed ignition relay is a car that suddenly stalls while operating.
- Car not starting.
- Dead battery.
- Burned relay.