Hi all, I got a check engine light on my '14 California, the ODBII code reads "P2402 Evaporative Emissions System Lead Detection Pump Control Circuit High" Here's what I've done: cleared code twice, it came back twice checked fuses checked gas cap disconnected and reconnected the secondary air pump (evap pump) measured resistance across pump terminals (<1 ohm) felt the evap pump while the car was idling in my driveway - it didn't seem like the pump was on, I'm pretty sure I was just feeling the engine vibrations. Does it run continuously? There are no other codes or issues I'm aware of and the car has been running fine like this for months. I ordered a replacement solenoid and a replacement pump which will get here in a week or so - I'll swap those when they arrive. Before I take it to a shop / dealer is there more troubleshooting I can do? Thanks in advance, Asa
as I'm going through the workshop manual I'm realizing the 'diagnostic pump' control circuit is probably the issue not the 'secondary air pump'
Do you mean replacement items for the Secondary Air system (before you realised the code related to the evap leak detection pump)? Image Unavailable, Please Login
Yep, everything I listed initially was mistakenly troubleshooting the secondary air system pump in the engine bay before realizing the error is about the diagnostic pump in the rear wheel well. Also, for anyone reading this later and struggling through my general confusion the error code is "...leak detection pump control circuit high" not "lead" - too late for me to edit my post. @Qavion I have the same manual (thanks for posting the image). Fortunately, I was able to cancel my order of the wrong parts. So, tomorrow I'll check the correct pump and I guess order a replacement evap leak detection pump and a new charcoal filter. I'm assuming "leak detection pump control circuit high" means voltage or current is higher than expected. If that is correct there is either more pressure drop than expected in the system (filter clogged/old?) or the motor is failing and drawing more current than expected. I'm also assuming that I would get a different error code if a leak was detected. I'll check the connections/fittings anyways. I also could be thinking about this entirely wrong. I'll post as I learn and/or give up and let a professional handle it
Sorry, had to edit my previous message. Got my wiring crossed. If there is a 4 pin plug on the pump, the circuit for the California's pump may be similar to the F430. The control/power arrangement will look something like this: Image Unavailable, Please Login If there is a 4 pin plug, at least check for power on pin 4 (key on) The control circuit for the pump may be on pin 3 of the pump plug. It may be checking the current through the motor. On the other hand, "high" might mean resistance? Pure guesswork
I guess you could also measure the pump motor resistance (pins 1 & 4 on the pump side, not the car side). Maybe simply for a reference for future diagnostics?
As I said while doing my engine mounts and gearbox mount, "what's the worst case scenario? Car falls of the lift, crushes me, and I slowly bleed out? That probably won't actually happen - so really it's all upside"
Update [solved] I decided to try some easy things first: replaced gas cap, battery, and engine air filters I bought a gas cap off eBay from a crashed Cali rest its soul, replaced the battery, and replaced the two engine air filters. That seems to have fixed the CEL. It’s been a couple days and 20 or 30 miles with no check engine light coming back. No idea if it was the battery or gas cap. I doubt it was the air filters but the battery job gets you 90% of the way to replacing the filters so I figured I’d do that too. Thanks for the advice
When you see "Low" or "High" with a Ferrari fault, it refers to the what the computer is seeing as far as the reference voltage that is coming out of the computer. "Low" is a short to ground, causing the voltage to be too low. "High" is an open in the circuit, causing the voltage to be too high. I suppose that you could equate resistance to the Low and High as well, since very low resistance = a short to ground, and very high resistance = an open. I have replaced a couple of evap diagnostic pumps on California's due to the fault that you are getting. The Low and High fault codes relate to voltage readings that the ECU sees, and have nothing to due with gas caps, battery or engine air filter.
