Question about 2002 Mitsubishi Galant

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I got a 2001 galant with p0340 code, i been checking the cam sensor conector and wires to computer and power supplie, 5 volts and 12 volts, and everything it is ok. i have this problem since i repair the head replacing the head gasket and i send the head to the shop for full service, replace timming belt and water pump too.....What do you think it could be ?????

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Posted on Jan 02, 2017

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SOURCE: I have a 2000 Mitsu.

Hi, I found a couple of good articles on those codes. Rather than just copy and paste here are the links:

P0335 - Crankshaft Position Sensor Electrical Error
http://www.bba-reman.com/content.aspx?content=NEXT_DTC_P0335

P0340 - Camshaft Positio Sensor Circuit Malfunction
http://www.obd-codes.com/p0340

Posted on Jan 03, 2009

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Po340 po344 code has no power and runs rough already changed cam postioning sensor(both) still sending codes had it put on a better computer now is saying there is an electrical problem can't seem to...


checked the spark plug wires if is cracked P0340 is no cam signalat the PCM is. The camshaft position sensor information, along with the crankshaft position sensor information, is used control the fuel injection synchronization. The excess heat from the catalytic converter indicatesunburned fuel going out the exhaust. The catalytic converteris designed to burn any fuelleft in the exhaust. It sounds like your injectors are definitely out of sync dumping raw fuel out the exhaust. Since youreplaced the both the sensors and the PCM, it sounds like a wiring problem betweenone of the sensors and the PCM. Always use a digital multi-meter so you don't blow the PCM. Pull the cam sensor connector and check, with the key on, for about 8VDC on the orange wire (power from the PCM), and put the negative lead on the black/light blue wire (ground.) If you get about 8 volts both of those 2 wires are good. That just leaves thetan/yellow wire (sensor signal.) The signal should fluctuate 0 to 5 volts as the cam notches pass the sensor. To check the wire you would have to probe this wire at the PCM with all the connections put together, key on, and engine rotating (either by hand or with the starter.) The crank sensor wiring could be checked basically the same way. Overheating the cayalytic converter can cause the ceramic beads inside of it to crack, requiring replacement. Don't overheat the converters if you can help it. Turning the key on with a sensor unplugged will usually set an OBD code that will need to be cleared. It sounds like your on the right track. Let us know how it goes. P0340 Camshaft Position (CMP) Sensor Circuit P0344 Camshaft Position Sensor Circuit Intermittent
With a P0340 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
  • Visually inspect all the wiring and connectors in the circuit
  • Check for continuity in the circuit wiring
  • Check the operation (voltage) of the camshaft position sensor
  • Replace the camshaft position sensor as required
  • Check the crankshaft position circuit as well
  • Replace circuit wiring and/or connectors as required
  • Diagnose/replace the PCM as required

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With a P0340 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:

•Visually inspect all the wiring and connectors in the circuit
•Check for continuity in the circuit wiring
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•Replace the camshaft position sensor as required
•Check the crankshaft position circuit as well
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Your P0340 is a different problem from your P0303, but they may be related.

Since the code P0340 indicates that there is something wrong with your cam speed sensor, your misfiring in cyl3 may be caused by this.

This points to addressing the P0340 error before the P0303 since it could be contributing to the 303 in the first place. Look at your cam speed sensor in cyl3 and maybe this would solve both problems at once.

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Hi, I found a couple of good articles on those codes. Rather than just copy and paste here are the links:

P0335 - Crankshaft Position Sensor Electrical Error
http://www.bba-reman.com/content.aspx?content=NEXT_DTC_P0335

P0340 - Camshaft Positio Sensor Circuit Malfunction
http://www.obd-codes.com/p0340

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the wires you are using may not be rated for 12 volts and a certain amount of amps try using beefier wires meant for 12 volt or above electrical sources.

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