CKP Sensor Circuit High Input (P0338)any idea? where to start? - S-10 Forum
 
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post #1 of 8 Old 05-26-2010, 05:32 AM Thread Starter
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CKP Sensor Circuit High Input (P0338)any idea? where to start?

After a lower intake gasket change I had misfire and general poor running conditions. After checking almost everything I finally could had a diagnostic tool available and the result is High Frequency on the CKP sensor (P0338).
I recon that I don't know where to start.
I know that one socket have been damaged while re-mounting the intake, could this be related to the CKP sensor?
What does mean high frequency on this sensor : faulty sensor or another trouble in the engine that is revealed by this CKP data?
Any help appreciated as I cannot use my truck for more than one month know( and spending many €uros around…)


98' Blazer LT - 4.3 l K & N Airfilter
87 Blazer Tahoe - 2.8l injection 4WD - 190000 Miles - stock rims
85' Jimmy - 2.8 l - Bodylift 2" - stock rims - 235 tires - Trush Muffler - 150000 Miles
62' Oldsmobile F85 4 door Sedan 3,5l Stock
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post #2 of 8 Old 05-26-2010, 11:08 AM
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Re: CKP Sensor Circuit High Input (P0338)any idea? where to start?

The only information I've found so far on DTC P0338 is problems that occur during start up.

It is possible that a damaged plug could cause problems, especially if the wire are in the wrong place now.

Quote:
Originally Posted by Bentenn14 View Post
If I had to guess, It's gonna be one of those things that seems like a longshot that's gonna be the problem. I've almost exhausted the short-shots.
Jim
'00 Blazer 4dr 4wd, '00 S10 RCSB,'99 Blazer 2dr 4wd, '97 Southwind 35W, '03 2500HD,'02 Yukon, '00 Harley, '06 GSXR, '00 250EX, '10 RZR
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post #3 of 8 Old 05-26-2010, 11:29 AM
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Re: CKP Sensor Circuit High Input (P0338)any idea? where to start?

DTC P0338 - Shows faulty crank sensor according to gms website... hope that helps
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post #4 of 8 Old 05-26-2010, 01:06 PM Thread Starter
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Re: CKP Sensor Circuit High Input (P0338)any idea? where to start?

Thanks for your informations, I'll probably change the sensor and see what's happening…another 100 bucks. For a while I had the engine that sometimes was staying stuck when I was cranking. I taught it was a faulty starter engine but in fact I guess this sensor is the true culprit.

98' Blazer LT - 4.3 l K & N Airfilter
87 Blazer Tahoe - 2.8l injection 4WD - 190000 Miles - stock rims
85' Jimmy - 2.8 l - Bodylift 2" - stock rims - 235 tires - Trush Muffler - 150000 Miles
62' Oldsmobile F85 4 door Sedan 3,5l Stock
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post #5 of 8 Old 05-26-2010, 02:21 PM
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Re: CKP Sensor Circuit High Input (P0338)any idea? where to start?

Quote:
Originally Posted by tahi View Post
…another 100 bucks.
$50-60 US

Quote:
Originally Posted by Bentenn14 View Post
If I had to guess, It's gonna be one of those things that seems like a longshot that's gonna be the problem. I've almost exhausted the short-shots.
Jim
'00 Blazer 4dr 4wd, '00 S10 RCSB,'99 Blazer 2dr 4wd, '97 Southwind 35W, '03 2500HD,'02 Yukon, '00 Harley, '06 GSXR, '00 250EX, '10 RZR
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post #6 of 8 Old 05-27-2010, 02:37 AM Thread Starter
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Re: CKP Sensor Circuit High Input (P0338)any idea? where to start?

Thanks for your help RaginInferno, I guess you should come here in France for vacation and have great time tuning my truck. We got nice beaches, good food and good party in summer lol.
Do you know where I can locate the crankshaft sensor on a 98 win W 4.3?

98' Blazer LT - 4.3 l K & N Airfilter
87 Blazer Tahoe - 2.8l injection 4WD - 190000 Miles - stock rims
85' Jimmy - 2.8 l - Bodylift 2" - stock rims - 235 tires - Trush Muffler - 150000 Miles
62' Oldsmobile F85 4 door Sedan 3,5l Stock
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post #7 of 8 Old 05-27-2010, 04:24 AM
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Re: CKP Sensor Circuit High Input (P0338)any idea? where to start?

underneath the pulleys a lil' bit on the passenger side of the block down there..pretty much right next to and/or on the timing cover

Brian

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post #8 of 8 Old 05-27-2010, 08:42 AM
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Re: CKP Sensor Circuit High Input (P0338)any idea? where to start?

Quote:
Originally Posted by tahi View Post
Thanks for your help RaginInferno, I guess you should come here in France for vacation and have great time tuning my truck. We got nice beaches, good food and good party in summer lol.
Do you know where I can locate the crankshaft sensor on a 98 win W 4.3?
haha...last time I was there, I was in Deauville, Trouville and Saint-Gatien (Airport)... I speak a good bit of Cajun French so we could hang out!

...and yes, the Crankshaft sensor is on the bottom of the timing cover, passenger side.

Quote:
Originally Posted by Bentenn14 View Post
If I had to guess, It's gonna be one of those things that seems like a longshot that's gonna be the problem. I've almost exhausted the short-shots.
Jim
'00 Blazer 4dr 4wd, '00 S10 RCSB,'99 Blazer 2dr 4wd, '97 Southwind 35W, '03 2500HD,'02 Yukon, '00 Harley, '06 GSXR, '00 250EX, '10 RZR

Last edited by RaginInferno; 05-27-2010 at 08:43 AM.
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