System Description: Notes
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The scan tool is first used to energize the fuel pump relay. The scan tool is then used to pulse each injector for a precise amount of time allowing a measured amount of fuel into the manifold. This causes a drop in system fuel pressure that can be recorded and used to compare each injector.
Injector Balance Test Example
| Cylinder | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|
| 1st Reading | 365 kPa (53 psi) | 365 kPa (53 psi) | 365 kPa (53 psi) | 365 kPa (53 psi) | 365 kPa (53 psi) | 365 kPa (53 psi) |
| 2nd Reading | 245 kPa (36 psi) | 200 kPa (30 psi) | 245 kPa (36 psi) | 240 kPa (35 psi) | 245 kPa (36 psi) | 255 kPa (37 psi) |
| Amount of Drop | 120 kPa (17 psi) | 165 kPa (23 psi) | 120 kPa (17 psi) | 125 kPa (18 psi) | 120 kPa (17 psi) | 110 kPa (16 psi) |
| Average Range: 117-137 kPa (16.5-19.5 psi) | Injector OK | Faulty injector - too much fuel drop | Injector OK | Injector OK | Injector OK | Faulty injector - too little fuel drop |