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Re: 2002 altima codes 1212 and 0011 please help
DTC P1212 - Mass Air Flow Circuit Intermittent Low DTC P0011 - "A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
A P0011 DTC trouble code may be caused by one or more of the following:
Incorrect camshaft timing
Wiring problems (harness/wiring) in intake timing control valve control solenoid system
Continuous oil flow to VCT piston chamber
Failed timing valve control solenoid (stuck open)
This DTC code is a result of a mechanical fault of the VCT unit or related components, so there is no need for electrical diagnosis. Refer to vehicle specific repair manual to perform component tests for the VCT unit. Notes: Dealer techs have advanced tools and the ability to follow detailed troubleshooting steps, including the ability to test components using a scan tool.
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on the cam shaft there is a dowel it sopose to be up while crank shaft pulley is aline to 0 in most case damper rubber on crank shaft pulley shifts and cant get timming line up. in that case you get #1 piston up make sure its # 1, then on cam shaft put #1 int. and exh. lobes opposite so int. and exh. are close ,when engine turns exh. opens