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2001 LSi P0340
Topic Started: Apr 14 2011, 10:32 PM (3,351 Views)
Third Gear
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Well, the car runs great unless it gets pretty warm outside then it will sometimes run rough - radiator fan functions normally. Noticed the check engine light doesn't work in this car. Discovered P0135 and P0340 with my scanner. P0135 is pretty easy to fix. P0340 is a little puzzling because the car starts and runs fine. If I unplug that sensor, the car basically dies out immediately.

Anyone else experience an intermittent problem like this? Maybe a grounding issue?
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Good bye


I would start with the grounds at the battery and then at the core support and transmission. The cam sensor may also open at high temps. I don't know what they cost but if you scrounge at wrecking yards a lot of good used sensors can be found. The cam sensor fits these cars:

Buyers Guide
Make Model Engine Year(s)
Chevrolet Metro 1.3 L 79 CID L4 1998 - 2000
Chevrolet Metro 2001 - 2001
Chevrolet Truck Tracker 1.6 L 98 CID L4 1999 - 2001
Chevrolet Truck Tracker 2.0 L 1995 CC L4 1999 - 2003
Suzuki Esteem 1.6 L 1590 CC L4 SOHC 16 Valve 2000 - 2001
Suzuki Esteem 1998 - 1999
Suzuki Swift 1998 - 2001
Suzuki Vitara 1.6 L 1590 CC L4 SOHC 8 Valve 1999 - 2001
Suzuki Vitara 2.0 L 2000 CC L4 1999 - 2001
Suzuki Vitara 2002 - 2003
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Bad Bent
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Facetious Educated Donkey

:hmm For what it is worth, at http://www.obd-codes.com/p0340 it says;

A code P0340 could mean one or more of the following has happened:

a wire or connector in the circuit could be grounded/shorted/broken
the camshaft position sensor may have failed
the PCM may have failed
there exists an open circuit
the crankshaft position sensor may have failed

Which is what me and my metro said, eh. Before panicking I'd start with that advice and move on the the open circuit, inspect the CKP and PCM connections. :-/
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Third Gear
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Yup. I will probably start with grounds first and inspect the wires. Junkyard isn't a bad idea, sometimes you can find some treasures. Places online want $50-70 dollars for a new one. This happens when it get hotter outside... perhaps the camshaft position sensor has a heat related failure when the oil temp gets above a certain range since it is in direct contact with engine oil.
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mwebb
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FOG

or choice C
timing belt alignment is incorrect , Mr ECM looks for CMP signal when it sees CKP in a certain place , if they do not match
it codes for CAM POS SENSOR but the sensor itself is fine it just reports in at the wrong time.

very common in the VW Audi world when DIY types do their own timing belts on ABA 2.o engines , DIY types do not do timing belts on the more advanced engines , but they also code for the same problem
some will not run if cam crank sync is wrong , to preserve the engine from valve to piston contact .

saturns will code for cam position sensors , p0340 , but saturns do not even have cam position sensors and they do not know cam timing at all
it is a failure in the spark module or a bad ignition wire on cylinder 4 or
both
does this car have DIS ? waste spark ignition ?
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Woodie
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mwebb
Apr 16 2011, 07:46 PM

saturns will code for cam position sensors , p0340 , but saturns do not even have cam position sensors and they do not know cam timing at all
it is a failure in the spark module or a bad ignition wire on cylinder 4 or
both
does this car have DIS ? waste spark ignition ?
Has to, it's a 2001. All 2001s were four cylinder, two coils, no distributor. Coils are mounted directly on two of the plugs, 2 and 4 I think, with a little two inch wire going from 2 to 3 and a huge six inch spark plug wire going from 4 to 1.


Edited by Woodie, Apr 17 2011, 07:43 AM.
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Third Gear
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Yes it is DIS, no distributor = one less headache. Interesting idea about the timing belt being a tooth off; I will keep that in mind. I didn't do the timing belt on this car, but it does run good most of the time. From my experience, engines don't like being a tooth off on the timing belt.
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Sinequa
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You could also try twisting the housing a little. I ran into this problem after I rebuilt. The cam sensor would code after the engine was warm the shut off and restarted with an hot engine compartment. Loosen the 3 bolts a little and turn a bit, in my case it was counter clock wise.
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mwebb
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FOG

Woodie
Apr 17 2011, 07:43 AM
mwebb
Apr 16 2011, 07:46 PM

saturns will code for cam position sensors , p0340 , but saturns do not even have cam position sensors and they do not know cam timing at all
it is a failure in the spark module or a bad ignition wire on cylinder 4 or
both
does this car have DIS ? waste spark ignition ?
Has to, it's a 2001. All 2001s were four cylinder, two coils, no distributor. Coils are mounted directly on two of the plugs, 2 and 4 I think, with a little two inch wire going from 2 to 3 and a huge six inch spark plug wire going from 4 to 1.


does the CMP cam position sensor have 3 wires ? or 2 ?

hall effect will have three wires
ac signal generator will have two

i can then upload an appropriate cam crank sync waveform
but
the user would need a 2 channel scope to test his / her car

testing of hall effect or ac signal generators is different as well , if i knew which it was i can detail testing procedures .... but for hall effect you must have a scope
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