Fuel Injector Balance Test-Fuel Pressure Test
WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
- Install a fuel pressure gauge. Refer to Fuel Pressure Gauge Installation and Removal .
- Turn ON the ignition, with the engine OFF.
- 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.
- Command the fuel pump relay ON with a scan tool.
- Observe the fuel pressure gauge with the fuel pump commanded ON. The fuel pressure should be 345-414 kPa (50-60 psi).
- If the fuel pressure is not within the specified range, refer to Fuel System Diagnosis (NT7, NU1) Fuel System Diagnosis (NU6) .
- Monitor the fuel pressure gauge for one minute. The fuel pressure should not decrease more than 34 kPa (5 psi).
- If the fuel pressure decreases more than 34 kPa (5 psi), refer to Fuel System Diagnosis (NT7, NU1) Fuel System Diagnosis (NU6) .
- Perform the Fuel Injector Balance Test with Special Tool, the Fuel Injector Balance Test with Tech 2, or the Fuel Injector Balance Test with the Active Fuel Injector Tester.
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