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I have a '96 Subaru Outback Impreza with some computer
Sent to Car Experts October 02 05:09 PM

I have a '96 Subaru Outback Impreza with some computer problems. The OBDII test gives me a code P0340. This is the crankshaft position sensor, it also says 'Bank 1 circuit malfunction', what does this refer to? But after replacing the sensor and driving for a while, the check engine light comes on at startup and does not let the car start. I changed this sensor several times and still get the same code. Could the ECM be bad? and is there a battery on the ECM that needs to be changed every so often?This car has been in one major accident and many minor ones - should I go through all the electrical connectors first to try to find a broken wire or poor connection?

 

Optional Information:
1996 Subaru impreza 2.2 litre

Already Tried:
replaced crank position sensor, reset codes, took apart and reseated most connectors in engine compartment. Reseated connection to ECM.

Customer (name blocked for privacy)
Status:  Closed   Value: $8
Answer
October 2 5:38 PM (29 minutes and 14 seconds later)
         
REPLIEDCheck Mark

You'll need to replace the CMP (Camshaft Position Sensor) as well. It actually needs to be tested using an automotive labscope, but commonly both sensors have a high failure rate, and one can set the others code. For example, if you have a failed CKP (Crankshaft Position Sensor) it can set a DTC (Diagnostic Trouble Code) for the CMP, if the CMP has failed, it will set a CKP code. It's such a common failure on earnly Subaru's, that the dealer sells these sensors in a kit, which comes with both. The PCM, has an internal Capacitor, which holds a small amount of voltage for memory, but is not serviceable.The CMP is located on the left (Driver's) side of the front of the engine.

-Rip

 



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RIP -- Lead Technician -- 100% Positive Feedback on 2108 Car Accepts
A.S.E. Master Technician, Advanced Level, Smog - European, Domestic, & Asian -- Car Category Mentor
Reply
October 3 3:33 PM (21 hours and 54 minutes and 35 seconds later)
         
Reply to RIP's Post: Do you mean to say that I should replace both the main computer and the crankshaft position sensor? Would you also please identify 'CKP' for me? It seems that you are talking about two different sensors, the crankshaft position sensor is one - what is the other one?
Customer (name blocked for privacy)
Answer
October 3 3:37 PM (3 minutes and 56 seconds later)
         
ACCEPTEDCheck Mark

As I stated above, the CKP is the Crankshaft Position Sensor, and the CMP is the Camshaft Posistion Sensor. Both will cause a P0340 code. You do not need to replace the "main computer," but the circuit has to be correctly diagnosed because the computer plays an important role in it.

-Rip



Please click on "ACCEPT" if I was helpful-or if you still need assistance just reply, before leaving any feedback thanks
Picture
RIP -- Lead Technician -- 100% Positive Feedback on 2108 Car Accepts
A.S.E. Master Technician, Advanced Level, Smog - European, Domestic, & Asian -- Car Category Mentor
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