PO1526 is a malfunction detected in the ABV solenoid valve (vent). This solenoid is used to verify the correct operation of the purge control solenoid valve. Although it is not used for anything other than a Diagnostic Support Solenoid it will bring a hard code of PO1526 when it goes bad. The troubleshooting procedure is fairly simple, although the solenoids and myriad of vacuum lines require careful checking to understand where they go. The main thing is to make sure the ABV solenoid valve (vent) is working. Suggest getting the All Data DIY subscription for your vehicle, it is reasonably priced and gives you all the info needed to properly troubleshoot this code. The website is www.alldatadiy.com. Good luck.
remove the plastic cover that says miller cycle engine on it. right about where "engine" is, you will see it. it has a gold dashpot with vacuum lines
The Supercharged 2.3 liter will have a large piece of black platic over the top of the engine that says "MILLER CYCLE ENGINE" in large green letters and 2 small air-to-air intercoolers inside the engine compartment.
2.3(miller cycle) is .7-.8mm(.028-.032in). 2.5 is 1.1mm(.044in). spark plugs with precious metals tips are NOT regappable. they come with the correct gap from the manufacturer. if the gap ain't right, it's the wrong plug
pull off the plastic cover that says miller cycle. the abv will have a yellowish vacuum "hat" on it, right below about where the 'cycle' word is. if your miller cycle cover is missing, then the abv will be on the back(driver side) of the engine, right in the middle. at the very end of the intake. you will see the yellowish vacuum dashpot on the end of it. but, that valve never goes bad. if you are getting 1540 codes, it is most likely vacuum or vent circuit/solenoids(p1525/1526)
if its a miller cycle engine its a nitemare 5.2 hours labor It's under the supercharger support bracket.5.2 hours is a rather anemic estimate as it took me almost that long to get the CAC assembly off.
Only a cyco freak knows that. 5.
SPARK PLUG GAP1999 Mazda Millenia 2.5L MFI DOHC 6cylThe Spark Plug Gap.044 (In thousandths of an inch)WRONG, WRONG, WRONG. read the question. Mazda millenia 'S' notice the S? the S engine is NOT a 2.5. it is a 2.3 miller cycle. the correct gap is .7-.8mm(.028-.032in). put in the wrong gap, like 1.1mm(.044in), and you will soon be buying new coils. about 174 each. times 6. plus new plugs, at about 12 bucks each, figger about 3 hrs labor. and NO, you cannot regap. if you do, then 174x 6 + 12 x 6 + 3 hrs labor.
I am sorry I cannot offer an answer to this as yet just to commiserate. I too have a 2000 millennia with under 80,000 km and the same malady. Is it blue or black smoke? Oil is leaking into the screw chamber on the supercharger,an early sign of failure.Another sign is oil pooling in the intercoolers.
living proof29s here, as i work in the within the automotive repair field (not a mech.) i can tell you that it is possible, i have seen a 98 2.3 with 212,000+ come by but it is not common. he was the only owner and took good care of the vehicle. and i have seen a 2.5 with 179,000+. the question is can you get more than 70,000 miles out of any of the front wheel bearings? not to my knowledge. i HAVE A 1995 MILLENIA 2.5,I GOT 114,000MI.my wheel bearing are still smooth,butti just replaced the tranny due 2 all the snow we had in baltimore,now im runnin strong again with 1 trouble code 02sensor..
bad coil(cop hates heat, coils short out when hot) bad gas-vapor lock bad fuel pressure regulator bad drainback valve, no fuel in the rail
most likely would be a bad plug or coil. but then, your ce lite would be flashing. then you could pull the code(s) and see for sure. but you knew that, right?
heat seems to be one of the weak points of the millenia cop system. generally, the right bank coils go first. also, oil in the wells can cause the coils to short out and die. my personal favorite is all the dummies who change their spark plugs, and put iridiums in there. even tho the gap is WAAAY off, they believe the aftermarket parts person OVER the dealer, and put the wrong plugs in "because the parts guy at autozone said they would work". the bigger gap makes the coil work harder, overheat, and die. if the plugs have not yet been changed(mazda says every 60k) then my money is on oil shorting out the coils. and it is really rare that it would need all 6.