At this point I connected my power probe to the oil control solenoid, and used both my manual pressure gauge and the WPS to view oil pressure as I manually applied power to the solenoid. This is where it would have been helpful to have a “T” to be able to view oil pressure and screw in the oil pressure switch. It is not reading oil pressure so the computer does not seem to send out the command. Also, when I remove the oil pressure switch it seems like, even though it is plugged in. Some thoughts came to mind, I cannot see in my capture that the solenoid is mechanically moving, I did not see anything in the waveform (pintle hump) etc to prove this. I wanted to condemn the pump, however I wasnt happy with that. The readings were the same, the pump is not capable of making the correct oil pressure. After taking these readings I decided to take the same readings with the solenoid unplugged. So I hooked my manual gauge to the oil pressure switch port, and took a reading at idle, 11-12 psi as previously tested (I wanted to see with my own eyes.) 2k RPM 15-17psi 4K RPM 30-35PSI. I read in the service manual, that with the solenoid unplugged, the oil pressure should be at max. The cost difference is severe, so I wanted to make the correct call on which component was failing. The solenoid is serviced separately from the oil pump. The oil pan has to be removed to access the solenoid. The oil control solenoid is mounted in the oil pump assembly.
This vehicle has a variable displacement oil pump that will reduce the oil pressure when the solenoid is commanded on. If that did not work, replace the oil pump.
To my surprise I had just as much data/info as I did with my autel elite.Īt this time the fault test plans were very vague, and the first step of the 2F5F code was to check oil level, and the next step was to replace the solenoid. I decided to hook up to the car with ISTA-D to see if I could gather any more info. This did however indicate low oil pressure, which was accurate. So, I decided to test the voltage return out of the oil pressure switch and at the DME connector. There was no data in the scan tool to show me what the computer was seeing for oil pressure. Using the Autel Elite/Snap on Modis ultra I was not able to gather much information on what the DME suspected the oil pressure was. The oil light would also come on, but would go off when you raised the idle to 2k rpm. And within a minute of the car idling, 2F5F-oil pump mechanical. At this point I scanned the vehicle for codes, there were a number of codes stored in the DME, only 2 were active at this time. I then checked the oil level, the oil level was correct. I could see that the oil pressure switch had been replaced. Upon receiving the car, I did a quick visual inspection. An off brand filter that was originally installed was exchanged for an OE Mini oil filter from the local dealer.
This car was running at the low end (hot idle) at about 11-12psi. This was done with the oil pressure switch removed, The minimum spec listed for oil pressure at idle is 10PSI.
While they had the switch out they checked the oil pressure with a manual gauge. They performed an oil change and also replaced the oil pressure switch. Customer immediately shut the car off, and called a tow truck.īefore taking the car in I questioned the service manager at the shop the car was towed in to. Customer complaint of oil light on at idle.