Need help to investigate why I keep getting a code P0093 engine fault which prevents me restarting the engine.
I am not an expert on such things.
The code indicates a large fuel leak has been detected. A dealer-standard diagnostic scanner might provide more information.
I am not sure how the management system detects a leak. There might be a pressure sensor somewhere or the system might be monitoring the current drawn by the fuel pump. A sudden drop in the current would indicate the pump is working less - possibly due to a leak.
While it would be natural to expect to see an expanding pool of fuel under the car and bewilderment if there isn't, the effect of a failed fuel pressure regulator, a blocked fuel pump intake or a situation where the pump is drawing in as much air as fuel would also significantly reduce the amount of work the pump is doing and therefore the current.
I suggest looking inside the tank for water or foreign matter and check the integrity of the pump, the prefilter and it's fittings and any inlet pipework. Once this is done replace the filter and carry out a fuel pressure and delivery volume test. The fuel pump relay might have to be bypassed for this.
If water has been discovered check the integrity of the tank breather system. If there has been any body or paintwork in the vicinity of the fuel filler expect foreign matter...
Once the fuel flow and pressure has been assured and if the fault still exists it would be reasonable to suspect a faulty pressure sensor somewhere, faulty wiring or connections, a faulty ecu or a software glitch.
Once any repairs have been carried out it would be necessary to erase the fault and might even be necessary to restore ecu defaults.
Jun 26, 2016 |
Cars & Trucks