System Description
WARNING: This page is about a different car, the 2003 Saturn LW200 and 2003 Saturn L200. 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. See FUEL INJECTOR BALANCE TEST WITH TECH 2 EXAMPLE (TYPICAL) .
FUEL INJECTOR BALANCE TEST WITH TECH 2 EXAMPLE (TYPICAL)
| Condition | Cylinder No. 1 | Cylinder No. 2 | Cylinder No. 3 | Cylinder No. 4 |
|---|---|---|---|---|
| 1st Reading | 55 psi (379 kPa) | 55 psi (379 kPa) | 55 psi (379 kPa) | 55 psi (379 kPa) |
| 2nd Reading | 31 psi (214 kPa) | 29 psi (200 kPa) | 30 psi (207 kPa) | 33 psi (228 kPa) |
| Amount Of Drop | 24 psi (165 kPa) | 26 psi (179 kPa) | 25 psi (172 kPa) | 22 psi (151 kPa) |
| Average Range: 22.5-25.5 psi (156-176 kPa) | Injector Okay | Replace Fuel Injector - Too Much Fuel Pressure Drop | Injector Okay | Replace Fuel Injector - Too Little Fuel Pressure Drop |