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 MANUALSCHEVROLET2000CHEVY EXPRESS G3500, VAN CARGO EXTENDED, 6.5 FREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM & COMPONENT TESTSFUEL SYSTEM (GASOLINE)FUEL CONTROLINJECTOR COIL TEST - ECT IS 50-95°F (3.4L)
2000 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.5 F
Injector Coil Test - ECT Is 50-95°F (3.4L)
2000 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.5 FSECTION Injector Coil Test - ECT Is 50-95°F (3.4L)
WARNING:
In order to prevent flooding of cylinder and possible engine damage, relieve fuel pressure before performing injector coil test procedure.
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. Go to next step.
- Install scan tool. Using scan tool, check engine coolant temperature. If coolant temperature is 50-95°F (10-35°C), go to next step. If coolant temperature is not 50-95°F (10-35°C), perform injector coil test. See INJECTOR COIL TEST - ECT IS NOT 50-95°F (3.4L) .
- Turn ignition off. Relieve fuel pressure. Connect Fuel Injector Tester (J-39021), Injector Switch Box (J-39021-210) and Fuel Injector Test Harness (J-39021-306) to fuel injector connector. Set amperage on fuel injector tester to Coil Test 0.5 amp position. Connect DVOM to fuel injector tester. Select fuel injector using injector switch box. Depress PUSH TO START TEST button. Record lowest voltage reading within first second of test. Repeat procedure for each injector. If any injector has erratic voltage reading or reading not within 5.7-6.6 volts, go to next step. If no injector has erratic voltage reading or reading not within 5.7-6.6 volts, perform injector balance test. See INJECTOR BALANCE TEST (2.2L - VIN 4 & 3.4L) .
- Replace faulty injector(s). After repairs, perform injector balance test. See INJECTOR BALANCE TEST (2.2L - VIN 4 & 3.4L) .
NOTE:
Perform step 3 on each injector.
RENDER: 1.0x
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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.