CX9 P0016, cam timing
Car presented with MIL illuminated, no particular drivability complaints. P0016 is bank one cam correlation. No timing chain rattles, no water pump bearing noises, no coolant in the oil. Scan data shows cams immobile, bank 2 at 5*, bank 2 at 10*. Note that bank 2 is closer to the crankshaft on the chain routing, so my first thought was chain stretch or loose water pump. However, when I clear codes, variable cam operation comes back. Correction factor shows as 1* on bank 2, 2* on bank one. 9* required to set this code. Test drive with Jamie watching the graphs on the scanner, and the requested advance is mirrored nicely by the actual. After several throttle changes on the drive, it resets the code, and goes back to being locked at 5* and 10*. There is a spike in the requested-actual difference to a bit over 10* as it sends the cams back to the zero position, for a few milliseconds.
Trying to find a good description of the code set criteria is a bit tough.
It seems that things just happen a wee bit slower than the system wants. As we are talking to the customer, who is collecting her car to head home, it occurred to me that the wrong oil could cause some issues. The oil in the engine is nice and clean, but this problem showed up after an oil change at a quick lube. Gets me wondering whether they grabbed the 20w50 spigot instead of the 5w20. Car has 120,000 km.
Comments? Questions? Silver bullets? Known good cam/crank waveforms?
The wrong weight oil can cause a slow response. I would suggest the correct weight oil and retest.
Hi James: You should be safe using Ford's code set enable criteria. HTH, Guido
James, Automotive Test Solutions has a pour in chemical that breaks down the sludge the inhibits the variable cam timing from working correctly. If the system is just sluggish, then it would help. 578d2c3f-4530-4edc-8b9e-50921f4a77cc.filesusr.com/ugd/a3454d_b03….pdf
"Automotive Test Solutions has a pour in chemical that breaks down the sludge the inhibits the variable cam timing from working correctly." Am I reading that wrong? Did you mean: "Automotive Test Solutions has a pour in chemical that breaks down the sludge that inhibits the variable cam timing from working correctly."
Is there any way to get a stethoscope close to the water pump to hear for a bad bearing or slop in the pump? It might be a good idea to just drain the oil and be sure you have the correct stuff in there. If it is always the same bank that sets that code after you are sure the oil is correct, I would put a new oil control valve in it, the old one may not be closing and sealing so the oil pressure…
I would change the oil and use recommended weight.I would suggest using a synthetic.Good luck