Fuel Injector Balance Test-Fuel Pressure Test
Fuel Injector Balance Test-Fuel Pressure Test1. Install a J 34730-1A.
2. Turn ON the ignition, with the engine OFF.
3. Command the fuel pump relay ON with a scan tool.
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.
4. Observe the J 34730-1A with the fuel pump commanded ON. The fuel pressure should be 384-425 kPa (55-61 psi).
- If the fuel pressure is not 384-425 kPa (55-61 psi), refer to Fuel System Diagnosis. Component Tests and General Diagnostics
5. Monitor the J 34730-1A 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. Component Tests and General Diagnostics
IMPORTANT: The fuel pressure may vary slightly when the fuel pump stops operating. After the fuel pump stops operating, the fuel pressure should stabilize and remain constant.
6. If a condition was not found, perform the Fuel Injector Balance Test with Special Tool or the Fuel Injector Balance Test with Tech 2.