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Old 02-12-2019, 09:55 PM   #1
Dogedog
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Default 2002 l200 P0340 Issue

Hello everyone name is Bill and I am new to the forum and the Saturn world.
Question is I have a 2002 Saturn l200, 2.2 engine with 120000 miles. I am receiving a P0340 code/camshaft positioning sensor and I know they donít have one and the ICM acts as the CPS. I noticed that cylinder #4 is misfiring causing the cylinder to fill with gas and drown out the plug. I put in new coil, ICM, NGK plugs, and spark plug boots. Tested #4 and verified itís getting spark. Put everything together and still receiving the same code, engine runs and idles rough and you can hear the misfire. I did pressure test all cylinders which were good, and tested intake manifold to verify it was not leaking. I purchased a new GM fuel injector and replaced the old one. Vehicle is still throwing the same code, I am at whits end trying to figure out what is wrong and causing the issue. Any assistance is greatly appreciated, thank you.

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Old 02-13-2019, 12:20 AM   #2
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Default Re: 2002 l200 P0340 Issue

If a compression test was performed, what are the actual numbers for each cylinder? If well below 185 psi then low compression may be causing cylinder#4 misfire due to either a burned exhaust valve or worn/damaged piston rings.

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Old 02-13-2019, 12:25 AM   #3
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Default Re: 2002 l200 P0340 Issue

#1 at 183, #2 at 181, #3 at 181, #4 at 180

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Old 02-13-2019, 03:07 AM   #4
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Default Re: 2002 l200 P0340 Issue

Great compression to rule out. Below is a reprint for DTC P0340. Keep in mind any reference in service manuals to 'scantool' implies GMs Tech II, a do it all scantool with programming abilities as well as extensive diagnostic capabilities to test every sensor and module to determine where fault lies for GM service techs, We in the real world cannot afford Tech II scantools unless several thousand dollars are available. And entry to this realm also requires a subscription to GMs website for everything to cover the entire GM family of vehicles. Generic scantools cannot perform service manual procedures.

Did you try measuring fuel pressures? Borrow a gauge from Autozone if possible. Maybe one injector is leaking. Normal pressures rise instantaneously when ignition is turned on without starting up. The ecm will cycle the fuel pump for two to three seconds then shut off, enough time to pressurize fuel lines and remain at pressure for several minutes. Any drop in pressure after a few seconds pass indicates a leak. Injectors are closed, pump check valve ensures the pump end prevents backflow and a pressure regulator ensures excessive pressures are relieved while maintaining specified pressure, 50-60 psi.
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File Type: jpg DTC 0340.jpg (73.5 KB, 6 views)
File Type: jpg DTC 0340-1.jpg (140.7 KB, 6 views)
File Type: jpg DTC 0340-2.jpg (184.2 KB, 6 views)

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Old 02-13-2019, 09:27 AM   #5
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Default Re: 2002 l200 P0340 Issue

Thanks for the information, I havenít checked fuel pressure with a gauge yet but pressure seems good considering that when I push on the valve after 10 seconds fuel shoots out pretty good. If pressure is good going to power probe the wiring to see if itís a spark, injector or ecm issue. If that passes only other thing I can think of is that it jumped time but it runs and sounds good on 3 cylinders and there is no noise in the timing chain area.

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Old 02-13-2019, 10:10 PM   #6
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Default Re: 2002 l200 P0340 Issue

Check fuel pressure it was at 56 psi, did power probe check on fuel injector 4 wires with key on engine off both wires was reading 12 volts. Upon starting blue/black wire was erratic jumping up and down in power not showing a good injector pulse. 1 through 3 had steady injector pulse readings. Figured it may have a bad wire between ecm and injector so tested pin #78 wire which is injector 4 which gave same erratic reading. At whits end with it canít figure out why I am getting the erratic pulse reading on #4. Could it be bad ICM? Bad wire? Bad ecm? It has a new ICM, coil pack, boots and plugs. Also the P0340 code is gone now showing code P0304.

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Old 02-14-2019, 12:19 AM   #7
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Default Re: 2002 l200 P0340 Issue

With the key on, disconnect the injector connector and check the switched side of the circuit to the negative battery post. Anything other than "out of limits" on the DVOM is not good. At this point to me it sounds like the driver for the #4 injector may be faulty. I would think if the wire was shorted to ground that it would pop the injector fuse. Put one wire probe from the DVOM on the swiched side of the injector connector (don't shove it in there, just touch the metal terminal), then touch the other lead to the negative battery terminal.

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Old 02-14-2019, 12:54 AM   #8
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Default Re: 2002 l200 P0340 Issue

Excellent troubleshooting! Are you working from service manuals to pinpoint which injector wires are involved in cylinder#4? Using the other working injector circuits to compare with #4 may be pointing to the............pcm, as shown below of injector wiring.

The fuel injection system on the DOHC 2.2L engine utilizes sequential fuel injection in which the PCM independently controls each fuel injector. The PCM grounds each fuel injector circuit for a certain length of time based on engine operating parameters. The fuel control system is designed to maintain a 14.7 to 1 air/fuel ratio under all engine running conditions except power enrichment (heavy acceleration/heavy engine load), deceleration and cold engine startup. The PCM can turn fuel injectors Off during deceleration, misfire diagnostics and traction control.
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Old 02-14-2019, 03:24 PM   #9
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Default Re: 2002 l200 P0340 Issue

Not using any service manuals just going off experience and research. All other injectors are pulsing within specs which I compared to #4 injector. I am thinking either the blue/black wire for injector 4 has a short because if the pink wire was bad it would effect the othe three injectors. Thinking of cutting the blue/black wire and run a new wire to see if there was a short. If that doesnít work may have to order a new pcm. Would a bad ICM cause a injector to pulse wrong? Since this model has no CPS and the ICM acts like one and you need at least two points for timing which I figure would be the Crankshaft positioning sensor and ICM. Or could it be the Crankshaft positioning sensor or both?

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Old 02-14-2019, 04:03 PM   #10
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Default Re: 2002 l200 P0340 Issue

As shown in the wiring diagram, the pink wires are in parallel for power to each injector. Ground is switched to each injector by (presumed) power transistors from the pcm. As long as power isn't strangled, preventing #4 injector from operating, its either the pcm or switched ground wire to it (using a new injector). What's unusual is cyl#4 filling with fuel. That suggests injector operation unless the switching transistor is shorting, powering the injector to release fuel, drowning spark. Removing the fuel rail, laying out open with injectors connected and wired while someone cranks the engine over may reveal whether or not the injector is pulsing correctly or powered on (injectors are pulse width modulated to vary injector on time resulting in controlled fuel amounts as needed). The fuel pressure gauge tells you if a fuel leak occurred when ign is turned on. Without an engine running, injectors are closed and pressures should hold for several minutes.

The crank sensor, to my knowledge, serves only one purpose - detect machined teeth on the crankshaft, generate precise timing signals sent to the pcm to allow the pcm to operate the entire EFI system. In essence, if the crank sensor (or chipped tooth on crankshaft) fails to generate signals, the pcm cannot operate at all. To date, the majority of intermittent or dead crank sensors have one characteristic - the engine cannot run since the pcm cannot operate without precise timing signals. The signals can be thought of as the electronic heart beat of the engine computer. No heart beat, dead pcm. The pcm turns on fuel pump, ignition system and pulses injectors. Maybe one or two members here swear an erratic engine was cured by replacing their crank sensor. All other members troubleshooting a dead engine were advised to verify spark (ign) and fuel (injectors) in cylinders (wet plugs). If both are missing, zero spark and zero fuel in cylinders, the crank sensor is likely the faulty part.

The camshaft position sensor error is electronically derived since a cam sensor doesn't exist on 2.2L engines. The icm determines timing and feeds errors to the pcm, sending data to the bcm to turn on the engine light and store a code for retrieval. The best anyone can do is ensure wiring and connections are clean and free of corrosion to prevent signals and power from being interfered and creating false self test errors. Ensuring grounds are good (battery to chassis, chassis to engine block) on the icm helps eliminate the easy stuff. Swapping icm and coil packs is another option.

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