P0342 P0343 Ls 6.0

Steven Owner/Technician California Posted   Latest   Edited  
Resolved
Electrical
P0342 — Camshaft Position Sensor "A" Circuit Low Bank 1 or Single Sensor
P0343 — Camshaft Position Sensor "A" Circuit High Bank 1 or Single Sensor
Rich
Poor Idle
Foul Spark Plugs

Vehicle: 1959 Chevrolet Apache. 

Engine: 2006 Chevrolet 2500HD 6.0

Transmission: 1999 4L80E

Harness: PSI Standalone.

ECU: 2004 Drive by cable express van, all unnecessary items tuned out.

Camshaft: Texas Speed Dual Spring Cam Package for Cathedral Port Heads (LS1/LS2/LS6) Vehicle: Chevrolet - Suburban - …, .600"/.600", 112 LSA 7.400" TSP .660" Dual Spring Kit w/ Integrated One-Piece Seat & Seal, Titanium Retainers, PAC Springs #199-ISSPACPOL660SpringKit

Timing set: Rollmaster CS1180 Iwis Seamless Single Roller Timing Chain Set LS Premium quality German manufactured IWIS 3SR60-2 Single Roller chain with seamless rollers Three bolt one trigger sensor Billet camshaft gear with Torrington Bearing to reduce friction 2005 LS2 Corvette or a … LS2 GTO/SSR/Trailblazer LH6 5.3L 6.0L V8 Gen III, Buick Chevrolet, Pontiac, Cadillac OEM GM part number …X crankshaft reluctor 9 keyway crank sprocket: 0, advance 2,4,6,8 degrees, retard 2,4,6,8 degrees Includes cam & crank sprocket, chain, bearing & oil pump drive Not for first generation small block Chevy or LT based engines.

When picoscope cam sensor signal wire scope voltage is low (0-9.8ish volt). When removing sensor and tapping magnet to sensor spike goes from 0-12 volt.

Verified grounds good (negative to body, negative to frame, engine to frame, engine to body, ECU to body.

Swapped sensor, no change.

Cam sensor 12v at power wire, ground at ground wire, 12v across power and ground at cam connector, signal wire no high resistance from sensor to ecu.

Code populates instantly after startup every time cleared.

This is a fresh build. Vehicle has never been driven with this motor/trans/harness/ECU setup.

All sensors and engine internals brand new. No used items installed.

Any other ideas to correct these codes? Thanks.

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Brandon Diagnostician
Arizona
Brandon
   

billet cam gear, hmmm. Is there maybe a clearance issue of the sensor to trigger wheel? Any cam crank sync needed for that ecm? Voltage drop test (loaded)on those signal wires back to the ecu? Those are my first thoughts. Are there enough engine grounds ?

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Stephen Owner/Technician
California
Stephen
 

Any paint build up on the block that would position the sensor too far from the reluctor ring?

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Stephen Owner/Technician
California
Stephen
 

Sorry, I thought it was a crank sensor

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Stephen Technician
Tennessee
Stephen
 

I would verify that the cam wheel has the pattern that the 2004(unknown engine?) ECU is looking for. Also read in detail what the code set parameters are to compare to the actual operation.

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Sergio Mechanic
California
Sergio
 

Make sure cam sensor pins are correct a lot of standalone harness have them swapped around

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Steven Owner/Technician
California
Steven
 

I did verify they are in the correct pin location on sensor and ecu side.

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Robert Diagnostician
California
Robert
 

Is it a new wiring harness or a factory harness that was cleaned up and made to work with the vehicle? I have seen the wires on the cam/crank sensors crumble inside the tape and short together. The other thing to check, Does the cam have the correct trigger for the cam sensor for that engine and computer? need to compare know good waveform to yours.

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Jeffrey Mobile Technician
Illinois
Jeffrey
 

Posting a psdata file with ckp included will help. 2004 express van PCM data should have ckp and cmp counters in them. side note. Pull channel 1 up from the bottom. We can’t see if there is negative voltage. Should always leave at least a division under zero on every channel!

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Todd Mobile Technician
Alberta
Todd
 

Please post a Pico file for this.

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Jesse Owner/Technician
Pennsylvania
Jesse
 

I agree with stephen parks on reluctor pattern, express vehicles sometimes are not the same as pickup on some things, also I don't own a scope but isn't the scope pattern sort of dirty? Also I think the fouled plugs are a different problem unrelated to cam sensor,

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Richard Mobile Technician
Florida
Richard
 

Assuming everything has been put together properly from the camshafts on then there would definitely be an issue with the ECU timing the injector pulse properly. You have a lot going on there and I hope you can solve those issues. I do not have a PICO Scope so I cannot give any advice on proper waveforms. I am believing your mechanical timing is correct so you would be dealing with an…

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Rich Mobile Technician
New York
Rich
 

As already mentioned the cam sensor i believe is to be white with 4x sprocket. The extention harness ive had a few miss wired , if it was s older engine replaced that had a 24x crank trigger the extention harness if I remember can be mixed with another plug, a 24x crank needs a 1x cam gear and a black cam sensor if I remember correctly, same with crank sensors , some instances you have to move…

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Steven Owner/Technician
California
Steven
   

It's a 24x crank with a 1x gear. Black cam sensor and swapped with another new sensor as a test. If I space it out wouldn't that cause a larger gap and even smaller spike? I'd assume the sensor would need to be closer to the cam if spacing was an issue, no? The sensor has no way to sit deeper and looks like it's not designed to be spaced out either. No extension harness installed and sensor is…

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Rich Mobile Technician
New York
Rich
 

Ls2 should have a 4x cam sprocket where a 24x needs a 1x also , dumb question but you don't have a vvt timing cover installed,? Some aftermarket cams will pop a false poo11 and needs to be turned off in the tune

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Steven Owner/Technician
California
Steven
 

It has a 24x crank and 1x timing set. No vvt cover installed and haven't had it set a P0011.

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Rich Mobile Technician
New York
Rich
 

One more thing hp tuners has a few pages on this issue when I had the false poo11 , but mine was vvt was bad, im guess you don't have vvt , check the color of your sensors, make sure you have a 1x sprocket unless you need 58x in your ecm, check extension harness , try plugging cam sensor without extension that will make wires backwards, check sensor gaps, rollmaster should had a cam sprocket…

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Steven Owner/Technician
California
Steven
 

No extension harness installed, cam sensor is mounted in back of the motor.

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Bill Owner
Maryland
Bill
 

Stephen, 2004 shows a different cam sprocket compared to a 2006 so I would also have to wonder if the ecm is looking for a different pattern ? All of the LS engines seem to use the same camshaft sprocket from … and then it changes. They may also have a mismatch between the cam sprocket and the crank reluctor wheel ? Here is a link explaining the combinations…

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Steven Owner/Technician
California
Steven
 

The link doesn't work for me but the ECU seller is saying since the cam sensor is in the back of the motor the front cam sprocket shouldn't matter.

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Rich Mobile Technician
New York
Rich
 

I just came back as I remembered the egr in the der harness plugs were the same , ls2 is 58x just so you know , I didn't look up your part numbers , but again 24x and 1x 58x and 4x 2 different color sensors. Extentiin harness makes the wires backwards,Torringto bearing may move cam gear, push all wires in connectors back in for a no intermittent connection, also cam codes will keep you in open…

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Rich Mobile Technician
New York
Rich
 

I'm not with it yet this morning but most 24x 1x engines the cam sensor are in rear of engine, I should probably reread your question after lunch, trying to figure out how to make a chrsler 300c 8spd tq converter lock up later, these cars lock up way to early and chatter the transmission till its junk

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Bill Owner
Maryland
Bill
 

Actually after looking at what those codes are it almost sounds more like a wiring or sensor problem.

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Steven Owner/Technician
California
Steven
 

Sensor is in rear of engine block

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Rich Mobile Technician
New York
Rich
 

Your issue is most likely you installed a ls2 cam that has no teeth to run a rear sensor. Only option is to change the front cover and get a extention harness and rear sensor plug

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Rich Mobile Technician
New York
Rich
 

I just talked to my buddy at tx spd and he stated if its a 3 bolt cam it should have the reluctor so thats probably not your problem but a ls2 cam might not , I would call. Tx speed with your part number and verify,

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Stephen Owner/Technician
California
Stephen
   

This is a long shot I thought I throw it out there. Take a look at the sensor harness plug, and how it relates the pinout on the ecu, 5.3 vs 6.0 A tech friend of mine did an engine swap from a 5.3 to a 6.0 on a trailblazer ss. He had to swap the pin connector at the plug. Looks like you're using an aftermarket harness? If so I would look into that. Perhaps the harness is used for 5.3 and a…

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Steven Owner/Technician
California
Steven Update
 

I spoke to Texas speed and three local tuners, all said the low cam spike was due to a bad tune from the ECU not knowing what to do. I sent the ECU off to one of the tuners who said he will do his thing and get all of that corrected enough to drive, then log some data and readjust the tune. I'll post an update after the ECU is back and tested.

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Steven Owner/Technician
California
Steven Resolution
 

I believe I have it fixed. ECU came back from the tuner. It ran much better but codes were still present, added another ground from battery to block with no change. Tried a couple times to do a crank relearn with a tech 2 only to have a failed result from the scantool. Took cam sensor out and saw some micro scratches on the cam sensor tip after doing those crank relearns. Put a new sensor in…

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Blaine Mobile Technician
Texas
Blaine
 

Did this fix your problem i have a 2004 chevy silverado 6.0 2wd with the same problem truck will start fine then ill drive it for an hour shut it off and it will crank over for about 5 seconds sputtering n a lil back firing then if I try to restart it it will fire right up and throw po343 changed cam and crank sensor done all my grounds im lost please help

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Steven Owner/Technician
California
Steven
 

Yes, in my case it looks like I'm the past someone probably sanded the mount bolt location for the cam sensor and caused the sensor tip to be too close to the cam. I found very minor scratches on the sensor tip after letting it run for a bit and giving it a few revs but it took a while for those marks on the sensor tip to appear. Sensor must have been just barely touching the cam because the…

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