I have measured the two pick-up coils and they are both within spec.
G+ & G- = 240 ohms (socket side to ECM = 6.5K ohms)
NE+ & NE - = 490 ohms (socket side to ECM = 20K ohms)
None of the pins are shorted to body on both ends. There is only a slight oil leak from the shaft, perhaps the "O" Ring need to be replaced.
Despite the MIL ON, the car is performing perfectly without any problem.
However, when I disconnect the G and NE socket, the engine cannot be started. Meaning the ECM is okay and is getting healthy signal to run the engine when connected. Just my gut feeling, if I am not wrong.
Question 1- Therefore, can this boils down that one of the pick-up is faulty that is creating the MIL alarm but not affecting the car performance. If so, which pick-up coil? The one with single cam or the one with 4 cams? I believe the one with a single cam is the G pick-up coil. Please advise.
Question 2- Does the RPM reading on the dash board come from one of these pick-up coil? (RPM on dash board is working well anyway)
Question 3 - Is there any other fault that can give a Code 12 diagnostic?
Question 4 - What is SPA? Not sure what you mean by "STA open or short circuit".
The MIL is now quite permanently ON when engine is running unlike week before where it came only once or twice in a day.
Your expert advise will help me to narrow down what to change. Pick-up coil, whole distributor or ECM.
Thank you so much.
Thursday, December 27th, 2018 AT 1:11 PM