Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2003SIERRA 2500 HD, 2D PICKUP, 6.6 1, RWD, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM & COMPONENT TESTING - 6.6LFUEL SYSTEMSFUEL INJECTOR BALANCE TEST WITH TECH 2TEST DESCRIPTION
2003 GMC Sierra 2500 HD, 2D Pickup, 6.6 1, RWD, Standard
Test Description
2003 GMC Sierra 2500 HD, 2D Pickup, 6.6 1, RWD, StandardSECTION Test Description
The numbers below refer to step numbers in diagnostic procedure.
- 3 - A balance rate between -4 mm3 and +4 mm3 will not cause a driveability concern. A balance rate less than -4 mm3 , between 4 mm3 and 14 mm3 will cause a driveability concern without any DTCs. A balance rate of more than 15 mm3 will set a DTC.
- 5 - This step determines if ECM can control a stable fuel pressure. A high balance rate may be caused by a fuel injector or compression only if ECM can control fuel pressure.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.