SC October2011.pdf - Parts & People
SC October2011.pdf - Parts & People
SC October2011.pdf - Parts & People
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FEWER STEPS.<br />
MORE PROFIT.<br />
WHEN WAS THE ELAST TIME<br />
A TROUBLE TREE EGOT YOU TO<br />
A CONFIRMED FIX IN<br />
FEWER<br />
ER<br />
THAN 5 STEPS?<br />
Direct-Hit <br />
is your bestsourcefor source proven<br />
nshort-cuttests tests and<br />
experienced-based fixes – sometimes in<br />
aslittle asfivesteps!<br />
steps!<br />
And the faster<br />
you fixit, it, themore profitable yourshop.<br />
Call 800-745-9649 -9649 today for your personal test drive<br />
and discover<br />
rhow easy it isto grow<br />
your business<br />
with Direct-Hit!<br />
PROBLEM:<br />
2007 Chevrolet Tahoe “ServiceEngine Soon” warning<br />
l lamp<br />
on with P0171, P0174<br />
DIRECT-HIT DIAGNOSTIC STEPS:<br />
1. Verify the fuel pressure is 50-60 PSI. If the pressure is low, verify<br />
the fuel pump has a good power supply on the Gray wire and a<br />
good ground on the Black wire.<br />
2. Check for wire harness damage from being routed too close to the<br />
front driveshaft.<br />
3. Using the scan tool Fuel Trim parameters, disconnect the Mass Air<br />
flow Sensor. If the Fuel Trim values return to normal, check for any<br />
unmetered air leaks.<br />
4. Block off the PCV tube and the brake booster hose. If the numbers<br />
return to normal, check for air leaks in either of those areas. Refer<br />
to TSB 08-06-04-016.<br />
5. Inspect for injector wires being connected to the wrong injectors<br />
per TSB 06-06-04-001A.<br />
CONFIRMED FIX:<br />
Replace the fuel pump (old one had only 45 PSI )<br />
800.745.9649 | identifix.com<br />
<strong>Parts</strong> & <strong>People</strong> October 2011 Page 29