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Discussion Starter #1
Pulling P0121, P0237, P0633, P1222, P2146, & P2149

Bought this truck, not the project that came with it. I have fixed countless things wrong with it that aren't apparent on first inspection or a test drive.<br />
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It is now throwing half the codes it did when I bought it (with a burned out CEL, a "New" clutch with a rusty throwout bearing that FAILED, a bad Fan Clutch Bearing & Clutch, Bad Front Axle U-Joints, Front/Rear Brakes, Bad IAT Sensor, etc.)<br />
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P0121 - APPS Signal Voltage Too Low<br />
P0237 - Turbocharger Boost Pressure Sensor Low<br />
P0633 - SKIM Key Not Programmed in PCM<br />
P1222 - Fuel Air Metering, Injector Controll Circuit<br />
P2146 - Fuel Injector Group 1 - Supply Voltage Circuit<br />
P2149 - Fuel Injector Group 2 - Supply Voltage Circuit<br />
P2609 - Intake Air Heater System Performance <br />
P2503 - Charging System Output Low (But I did just replace a battery)<br />
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Looking for some guidance here. The truck fires right up and idles smooth. It does NOT get the dead pedal like an APPS failing. It drives smooth and feels fine on the level.<br />
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Pulling hills, it feels like it is not making enough boost. Underpowered.<br />
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But the truck absolutely is NOT in limp mode. I could drive it 100 miles on the highway today and not feel underpowered. Get on a steep city hill and it feels sluggish. FWIW, it is WAY less responsive than my friends stock 6.7L and comparable to my 99' 5.9 Intake/Exhaust truck. <br />
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It runs too smooth, no smoke, etc. for me to be convinced I have multiple bad injectors. I am leaning towards a faulty MAP Sensor, the SKIM Key thing leaving the truck in a detuned mode?, or a Waste Gate that is stuck open. <br />
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I am open to any and all suggestions.<br />
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Joe
 

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Discussion Starter #2
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Originally Posted by <strong>lpennock</strong>
<a href="showthread.php?p=6741570#post6741570" rel="nofollow"><img class="inlineimg" src="http://image.autoforums.com/cumminsforum/buttons/viewpost.gif" border="0" alt="View Post" /></a>
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<div style="font-style:italic">Check your grounds and the cable between the battery positive terminals.</div>

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</div>I think so too. <br />
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<font color="gray">Sent from <a href="http://www.autoguide.com/mobile" target="_blank">AutoGuide.com App</a></font>
 

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Discussion Starter #3
UPDATE - I Cleaned all the grounds, all the connectors (on the harness and each sensor), every connector on the TIPM, the grounds on the Cummins ECM, etc.

It now is only throwing the Key SKIM code and p0483 Cooling Fan Speed. Oddly, the Fan Clutch assembly is new, the harness is not chewed up, but it is the ONLY pigtail on the main harness that I did not clean out with contact cleaner.



Joe
 
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