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Hey there 👋 I just picked up an 06 LSJ coupe. There are several that I’m trying to figure out, hoping for some help or insight.
P0202 - Cylinder 2 Injector Circuit A
P0033 - Supercharger Bypass Valve circuit A
P0341 - Camshaft Position Sensor ‘A’ Circuit Range/Performance Bank 1 or Single Sensor
If I clear the codes, P0202 comes up immediately and the CEL illuminates. The other 2 take longer to show up. Not sure what to make of this. The following parts are new:
Thinking multiple ‘A’ circuits may have a bad ground, I checked the ground under the drivers headlight. The grounds’ nut was rusty. Also checked the ground on the bell housing bolt, took a wire brush to it and reinstalled the nut, bolt and 3 ground wires. Are there other grounds i can check?
I replaced the cam and crank sensors because the car had a really hard time starting and when it would start, if you put it in gear and tried to accelerate it would stall. I did align the came sensor with the mark on the cam sensor housing during install. Even did the timing chain 10 and 2 positions with the valve cover off when I did the cam and crank sensors. Did the crank relearn via HP Tuners. Car runs great, just sucks that it makes only 2-3 psi of boost and feels kinda sluggish. Where should I look next?
Any help would be appreciated!
Last edited by SC06SS; May 30, 2024 at 06:08 PM.
Reason: More accurate words
I hate when people start threads to figure things out but never post solutions or results so here’s mine in case anyone reads this in the future. I figured out my DTC codes issue. It was my PCM. Since I had several codes that involved “Circuit A”, I decided to start checking the harness between the fuel injectors and the PCM. All injectors ohm’d out to roughly the same value, so no issue there. Next up was the fuel injector wiring harness. The resistance values for the first 4 wires in the harness were 297, 75, 299, 295. The first value was for Cylinder #2 of which I had a code for. The second value of 75 was for cylinder #4 that I DID NOT have a code for. With the PCM unplugged, the values dropped to around 0. Like 0.5 or something like that. I don’t understand how to use Ohms on a voltmeter, but after that test I ruled out the injectors and wiring harness and ordered a PCM because the computer was reporting a problem where there was none and not reporting a problem where I did find one.
New PCM came in, did the security relearn procedure. Turning the car to Key On Engine Off for 10 minutes, 3 times with about a 5-10 second pause between them. Car started but didn’t run well for a minute or so. Code P0315 Crankshaft Position Variation came up immediately. I let it warm up to Normal Operation Temperature. With my left foot on the brake, I revved the engine up with my right foot to fuel cutoff ~4000 RPM and the Check Engine Light went off. A week later it hasn’t returned. Fixed so far 🤙
Figured out the low boost issue. Bypass valve wasn’t adjusted correctly. Throttle plate was open not allowing boost pressure to build. Boost leak.
Adjusted the bracket for the valve so that the throttle plate is fully closed when the bypass valve is at rest was the correct repair. Now boost is up to 10-12 psi
Figured out the low boost issue. Bypass valve wasn’t adjusted correctly. Throttle plate was open not allowing boost pressure to build. Boost leak.
Adjusted the bracket for the valve so that the throttle plate is fully closed when the bypass valve is at rest was the correct repair. Now boost is up to 10-12 psi
Hey man Quick question. First where did you get your pcm and how much was it?
secondly did you buy a new supercharger gasket when you took off your sc to adjust the throttle plate?
Hey man Quick question. First where did you get your pcm and how much was it?
secondly did you buy a new supercharger gasket when you took off your sc to adjust the throttle plate?
SpareECM off eBay. Was $120 shipped. You can also get one from FlashMasters for a few bucks more. Same thing.
Sellers program a replacement PCM to your VIN. You just have to perform both security and crankshaft position sensor relearn procedures which don’t require any tools. I did not replace my supercharger gasket. The gasket stayed on the intake manifold and wasn’t damaged.
Sellers program a replacement PCM to your VIN. You just have to perform both security and crankshaft position sensor relearn procedures which don’t require any tools. I did not replace my supercharger gasket. The gasket stayed on the intake manifold and wasn’t damaged.
Sellers program a replacement PCM to your VIN. You just have to perform both security and crankshaft position sensor relearn procedures which don’t require any tools. I did not replace my supercharger gasket. The gasket stayed on the intake manifold and wasn’t damaged.
man you’re actually the goat thank you so much. I’ll get the pcm and let you know how it goes!!!
Originally Posted by Zack Procopio
sorry man one last thing. Did you install your pcm yourself? It should just be unplug the old one and put a new one in right?
Yes, installed it myself. Just unplug the 3 connectors and plug in the new PCM. That’s it. Please note, I had 2 separate sets of issues when I started my diagnosis. I had already replaced the boost solenoid and bypass valve, no change. Did the bypass mod, no change. I tested my harness and came to the conclusion that my PCM was my issue because of inconsistent reported data and ohm readings. I replaced my PCM and that fixed my codes. Still had the low boost issue which was there from the start and after inspecting the blower, I was pretty sure it was because of the bypass valve not being properly adjusted. Just reiterating my experience before you spend your money lol
Yes, installed it myself. Just unplug the 3 connectors and plug in the new PCM. That’s it. Please note, I had 2 separate sets of issues when I started my diagnosis. I had already replaced the boost solenoid and bypass valve to no change. Did the bypass mod and no change. I tested my harness and came to the conclusion that my PCM was my issue. I replaced my PCM and all of my codes went away. Still had the low boost issue which was there from the start and after inspecting the blower, it was because of the bypass valve not being properly adjusted. Just an advisement before you spend your money lol
yeah I’m going to take off my blower this weekend and see if that’s the problem first then go to buying the pcm if it doesn’t work. I have the same exact problem as you and have troubleshooted the same so I will check this weekend to see how the throttle body on the blower is set.
yeah I’m going to take off my blower this weekend and see if that’s the problem first then go to buying the pcm if it doesn’t work. I have the same exact problem as you and have troubleshooted the same so I will check this weekend to see how the throttle body on the blower is set.
