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Home >> Chevrolet >> 2011 >> Impala LS, 3.9 M >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Engine Controls And Fuel - 3.5L - Troubleshooting & Diagnosis) >> Fuel Injector Diagnosis (J39021 or Tech 2) >> Component Testing >> Fuel Injector Balance Test-Fuel Pressure Test

Fuel Injector Balance Test-Fuel Pressure Test

WARNING: This page is about a different variant/trim than selected.
  1. Install a fuel pressure gauge. Refer to Fuel Pressure Gauge Installation and Removal .
  2. Turn ON the ignition, with the engine OFF.
    3. IMPORTANT:
    • The fuel pump relay may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.
    • DO NOT start the engine.
  3. Command the fuel pump relay ON with a scan tool.
  4. Observe the fuel pressure gauge with the fuel pump commanded ON. The fuel pressure should be 384-425 kPa (56-62 psi).
  5. Monitor the fuel pressure gauge for one minute. The fuel pressure should not decrease more than 34 kPa (5 psi).
  6. Perform the Fuel Injector Balance Test with Special Tool or the Fuel Injector Balance Test with Tech 2.
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