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Re: engine turns but won't start
DATE: January, 2007
MODEL: 2002-07 Lancer 2.0L
SUBJECT: HARD TO START ENGINE DTC P0340 (and P0335)
The engine may be hard or impossible to start and MFI DTC P0335 and possibly P0340 may be stored due to abnormal wear to the camshaft position sensor support. Oil grooves have been added to the camshaft position sensor support to improve lubrication
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most likely you have a bad crank sensor or fuel problem you need to check fuel pressure ,if you have enough pressure ,most likely you need crank position sensor,if you don`t have fuel pressure ,it might be your fuel pump relay or the pump, i would start with the relay first very unexpensive. you can also hear the pump if it`s working by cranking the engine and listening rear of the car for a humming sound . good luck
Check for 12V on both sides of that 15A fuel pump fuse. The fuel pump relay is ahead of that fuse and it is controlled by the engine controls system. The PPL/BLK wire from the fuse is connected to the powertrain control module (PCM) When the fuel pump relay operates, 12V also passes through the 3A PCM memory fuse (check it) and is applied to the PCM. In addition, there is an inertia fuel shutoff switch (IFS) connected to the PCM and it may have cut off the fuel supply.
Power to the pump is provided by the relay for the first 3 or 5 seconds to build pressure back up to start. Once the 5 seconds are past, the relay is grounded by the computer IF it sees oil pressure or crank signals. This helps prevent a fire if the car is in a wreck. If it still won't start with the pump relay bypassed, you would check for spark and see if the computer is getting a crank signal.
if the injector fuse is blown then the car won`t start as its not getting fuel into the motor to fire.if the fuse keeps blowing then you could have an injector/s that is drawing too much or the injector driver in the ecm may not be any good and needs replacing or a used ecm.it could be a short some where in the wiring for the injector system that is going to ground.
You have to first see if you get fuel and or spark. To check spark you need an extra spark plug to put into one of the wires and lay it on something grounded. When you turn over the engine you should see a spark from the electrode. If no spark you can take out your ignition control module and have it checked at you local parts store for free. They also will give you readings to check your coils to see if they are ok. Your ecm can be checked by a larger shop or at dealership shop. If you are not getting fuel you should turn key and listen for the pump to kick on. If you do not hear the pump you should check your relay first in the fuse and relay box. If the relay clicks when you turn the key on then I would say the fuel pump is bad.
INSTALL PRESSURE GUAGE THEN CK, VOLTAGE TO PUMP PCM TURNS ON PUMP RELAY FOR 2 SECONDS WHEN KEY CYCLED ON ,, IF NO POWER CK INERTIA SWITCH ( MAY BE TRIPPED ) IF NO POWER TO INERTIA SWITCH CK FUEL PUMP RELAY IF NO VOLTAGE AT PUMP RELAY THEN CHECK FOR SPARK AT PLUGS IF NO SPARK CK PCM POWER RELAY IT SUPPLIES VOLTAGE TO PCM THAT INTURN POWERS FUEL PUMP RELAY