Mazda CX-7 This sporty turbocharged 4 cylinder SUV combines the spirit of a performance car with the versatility of an SUV.

Please help CX7 Rebuild engine p0012

Old Jan 5, 2020 | 12:14 PM
  #1  
Turborattler's Avatar
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From: Oakboro NC
Default Please help CX7 Rebuild engine p0012

Need help badly I have done every thing I can think of I'll do my best to explain what all I've done. I bought this car with a blown engine I rebuilt the engine completely all new parts. New oil pump new rod an main bearings rebuilt head bought new turbo off Amazon. Keep getting code p0012. So bought another new oil pump bought new vvt Actuator new vvt solenoid. When it's been driven for a while oil light will come on at idle if you let it idle awhile and still get p0012. The pending code pops up with in 1 mile takes 40 to 50 miles for light to come on. So with the oil light coming on I pulled cam caps plastgauged them to check clearance wouldnt even smash the plastic gauge. Started milling caps untill I had .0015 on all caps. Oil light is no longer coming on but code is still coming back p0012. The first turbo I got went out with in 100 miles. Amazon sent me another felt shaft for play was no play like the first one we got. Was going to take oil pump off today and shim pump spring to get more pressure and I notice a lot of oil in the air box tubes going to turbo. Can someone please tell me is it possible for my oil pressure loss be caused by the turbo and what should my oil pressure be at hot idle I had 8lbs when light was coming on. I also pulled bottom end back down and checked clearance had .0015 on all bearings. I'm at my waist end cant get any info from dealer can someone please help me with this info. Can the turbo be causing oil pressure loss causing the p0012 code is there any place I've not looked that can cause this. I was starting to think I had bad ecm bought one from junk yard took it dealer to get it programmed they came out and said I didnt need a ecm I needed a new engine. Said oil light was on and when that code started there was nothing that could be done to fix it. I say bull crap to that anything can be fixed if you know what's causing it
 
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Old Jan 6, 2020 | 03:51 AM
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grim_reaper's Avatar
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From: Queensland Australia
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DTC P0012 CMP Timing over-retarded
DETECTION CONDITION

• Actual valve timing is over-retarded by 5 ° (when the following conditions are met) from the target valve timing for 5 s when the OCV system control is within the feed-back range.

MONITORING CONDITION― Engine speed is below 4,000 rpm.
― Engine coolant temperature is 70—110 °C {158—230 °F}.Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA is available.
• DTCs are stored in the PCM memory.

POSSIBLE CAUSE
• Low engine oil pressure
• Loose timing chain or improper valve timing due to timing chain slippage
• OCV malfunction
• Spool valve in OCV is stuck in the retard position.
• Variable valve timing actuator is stuck in the retard position.
• Following oil runners are clogged or have leakage.
Oil runners• Between oil pressure switch and OCV
• Between OCV and variable valve timing actuator
• In variable valve timing actuator• PCM malfunction
 
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Old Feb 23, 2020 | 10:00 AM
  #3  
luklyz's Avatar
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From: Wisconsin
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Do you still need help?
I have a few questions. Went through something like that with my cx-7.
 
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Old Jan 12, 2022 | 01:50 AM
  #4  
jserv's Avatar
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From: Australia
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Ever get to the bottom of this? I have the exact same issue after a top end rebuild and just can't get the P0012 code to clear. Tried re-facing the oil cap and all that.
 
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Old May 29, 2023 | 09:52 AM
  #5  
Corndog26j's Avatar
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From: South carolina
Default P0012

Did you ever resolve this? Having the same issue with a commercially rebuilt motor I installed. I’ve changed the OCV because the resistance was at 9 ohms. Should be 6.9-7.9 ohms. Well that didn’t do it.
Book says something about initializing the OCV? Doing a KOER test?
 
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