Table of Contents
How do you jump a DME relay?
To completely bypass DME relay you will need to jump pin 3 (86) “ignition switch power” to pins 8 (87) “DME power” and 4 (87b) “fuel pump power.” You can do this directly on the socket by using a set of jumper wires or by connecting the pins on the DME relay itself before plugging it in.
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.
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.
How do I know if my DME is bad?
Common Signs of a Faulty BMW DME, ECU, ECM, PME
- Sudden jerking or stopping while shifting gears, even though you maintain your transmission properly.
- Fan running on High.
- Unexplained error codes when all components have been tested or replaced.
What is a DME on Porsche?
Digital Motor Electronics (DME) is a microprocessor based system that controls the ignition, fuel injection, oxygen sensor, and numerous ancillary functions of an automobile. DME can fine-tune the engine hundreds of times a second to provide maximum performance and efficiency.
What is a Porsche DME report?
A DME report is generated by using the proper test equipment to read out any engine faults that have been stored in the DME or ECU memory. This is an important part of the pre-purchase inspection (PPI). Take a look at your PPI and it might have a section for engine faults or codes – that would be the DME report.
Where is the DME relay on a 1985 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.
Where is the fuel pump relay located 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. These relays are prone to failure, a lot of failures.
How does the DME relay work in a Porsche?
When you switch on the ignition the ECU sends a current to the DME relay which then switches on the ECU ready to control the engine. Then when the the starter motor is cranked, the ECU activates the second relay in the DME relay and power is supplied to the fuel pump for as long as the engine is running.
Is there a way to bypass the DME relay?
You can bypass the relay for testing purposes to eliminate the relay completely from your troubleshooting list. Use three pieces of 14-gauge wire along with three male spade connectors. Note: this should only be used to test or in an absolute emergency situation; do NOT regularly drive your car with this in place.