AboutRay Niemi Expertise ASE Master Rated. Ask any questions about Volvo models up to 2000. Runnability, starting and charging system, diagnostic codes, brakes, front end, where to get certain parts. Should I buy this Volvo or not? I will try to answer your question and give you the knowlege to make the best decision in your case.
Experience I started working on Volvo's in 1978 at the dealer and attended all the schools and achieved a Master rating. Since 1999 I have worked at independent shops and now own my own shop.
Organizations Alldata on line repair manuals. IATN network of techs.
ASE rating of Master.
Use Actron CP9135 to diagnose "check engine" light. There is a long delay before the CP9135 turns on. Don't know if it is a long delay or me tapping on connection for it to turn on.
when it turned on, i found errors P0236 & P0237. i replaced the booster pressure sensor and MAP sensor. using the actron to erase the code (again long delay to come on). i was able to erase 2 of 3 errors. the error that i am unable to erase is P0236.
btw; i've had this check engine light for about 6 months and i've just recently replace the battery (don't know if this has anything to do with the issue).
do i need to go through drive cycle to be able to erase this code? i don't know if the long delay for the CP9135 to come on or recently replaced battery that i need to go through drive cycle?
thx,
vu.
Answer Vu,
If the code will not clear I a would say there is stil a fault.
The control module checks the signal from the boost pressure sensor if the module has not detected a fault in the manifold absolute pressure (MAP) sensor or the mass air flow (MAF) sensor. Diagnostic trouble code (DTC) ECM-AD is stored if the signal from the boost pressure sensor is lower than a certain limit (signal too low) when the ignition is on but the engine is not running.
Diagnostic trouble code (DTC) ECM-AD is also stored if the signal from the boost pressure sensor is higher than a certain limit (signal too high) when the engine is running,
Substitute Value
No leak diagnostic.
Possible Source P0236 is A.K.A. ECM-AD
Signal too low
Contact resistance in the terminals
Defective boost pressure sensor 1.
A drive cycle is not needed to clear a fault code.
