It has died out when drivig , , service light soon cam on , the code was p0340 . i cleared the code and it died out again after 2 days and 50 miles of driving , with no codes reappering in the ecm. i have cleand the throtle body , which cured the dieing out when at idle . when it does die it will restart right away . It is a 02 chevy trailblazer 4.2l

why ask a clerk? that??
J18 engine has 2 key sensors,
CKP behind the flywheel (aaahhhcraaappppp)
and
CMP on rear of cam,
so what is 340,well the service manual is clear
why not ask it , NOT/clerks.
340 is CAM, or CMP sensor.
lucky you.
no pull transmissions!!

btw ,crank sensor sets DTC p0335

if not wanting to guess, and get rumors and lies.
ever see this?
posted 100s of times. the real deal.
just $4


https://suzukipitstopplus.com/Products/10133-1999-esteem-service-manual.aspx

this is easy, 340 is fully cover here
http://www.alldata.com/
Camshaft Position (CMP) Sensor Circuit
the sensor is bad/dead or intermittent.
the modern engines, (some) can run a while with one or both RPM
sensors bad.(not both same time)
there are 2, the CMP and the CKP.
crank, and cam in english.
on some cars, the ECU goes to limphome when one dies.
btw , both need to work for OBD2 MISFIRE to work.
use alldata, look up the code for your year, then look up
Diagnosing, CMP ,

some cmp on suzuki are very smart, they have dual sensors inside.
this allows limp home to work better.
the cmp is at the rear of the cam on most suzuki.

no need to pump the gas on fuel injected vehicles.
Make sure CPS was installed correctly.

• P0340 - Camshaft position sensor circuit malfunction.
  
• P0457 - Evaporative emission control system leak detected (fuel filler cap loose/off)
  
  There is a bulletin #0398 posted on 05/12/2003 for P0457 - Malfunction indicator lamp (mil) illumination with diagnostic trouble codes p0442, p0455, p0456, p0457, p1442 or check fuel cap lamp illuminated with diagnostic trouble code p0457.

I'd suggest checking with your local dealer, as it may be a fix that is covered by the dealer.

P0340 is cam position sensor. P1685 is for the key(has a chip in it) P1684 is battery has been disconnected. If the engine will still crank then codes P1684 & P1685 are probably old codes. So if the car will still crank, lets forget about those codes and focus on P0340 A bad cam position sensor will cause the engine to die and not allow it to start back up. Replace the cam position sensor and clear the code and the car should start up.

p0340 states: Cam Position Sensor A circuit (Bank 1, or single sensor)

p1318 : unknown code cannot find online or in my code reader definitions.

remember the code does not mean the part is bad just where to look for bad wires, connectors and to test for bad parts.

code p 0340 refers to cam shaft (CMP)sensor A bank 1---circuit malfunction===causes --wiring---CMP sensor ---ECM
indications are faulty harness connections , faulty wiring (stopping the starting indications ) and lastly replace the sensor

when run with a misfire, the cat will get loaded up with fuel, it takes awhile for it to burn out, and a code may set, on some occasions it ruins the converter, try clearing it and running it

Glad I can help. :)

hi greg check our gaz pressure i lock forward to it will find the problem have a good day from montreal canada pierre