In a typical fuel injector balance test, the Tech 2 is used to pulse a single injector on a non-running engine (key on) to test the flow of that injector. A fuel pressure gauge connected to the fuel rail indicates the pressure drop resulting from the pulse of each injector.
Comparing the pressure drops of all of the injectors on the same vehicle indicates if all injectors are operating properly. This test can be done without vehicle disassembly and serves as a quick troubleshooting step during vehicle repair.
Alternate Procedure Required
The Tech 2 Fuel Injector Balance Test output control function does not work on some vehicles equipped with the PPEI 3 theft immoblilzer system.
Some engines in the following vehices are affected:
- 2006-07 Chevrolet Impala/Monte Carlo
- 2006-07 Buick Lucerne
- 2006-07 Cadillac DTS
- 2007 C/K trucks
TIP:Â A complete listing of vehicle/engine combinations is available on the TechLink website, under the Reference Guide tab.
After one of these vehicles is in the key-on/engine-off state for 10 seconds, the immobilizer sets a fuel injector disable flag. Once the fuel injectors are disabled, the two Tech 2 output control functions are disabled (fuel injector and starter relay).
A fuel injector balance test cannot be completed within 10 seconds. So, an alternative balance test procedure is required. Refer to this heading in SI: Fuel Injector Balance Test With Special Tool.
TIP:Â If the AFIT (see main article) is used on these vehicles, fuel pump operation can be controlled by the tester through the DLC. However, additional jumper harnesses must be installed to the operate the injectors.
TIP:Â The Fuel Pump Output Control on the Tech 2 will still work.
There are two ways to tell if the vehicle is affected:
1. Use the list on the TechLink website under Reference Guide.
2. When trying to use the affected Output Controls (if available), the return message "Fuel Enable Not Set For Theft Deterrent" will be displayed on the Tech 2.
Effective with TIS Data version 5.0 (May 1, 2006), the Fuel Injector Balance Test is removed from the Tech 2 for the vehicles mentioned above. Refer to Tech 2 version 26.004. The Starter Relay Output Control will also be removed.
- Thanks to Mark Stesney and David Schulte
Comparing the pressure drops of all of the injectors on the same vehicle indicates if all injectors are operating properly. This test can be done without vehicle disassembly and serves as a quick troubleshooting step during vehicle repair.
Alternate Procedure Required
The Tech 2 Fuel Injector Balance Test output control function does not work on some vehicles equipped with the PPEI 3 theft immoblilzer system.
Some engines in the following vehices are affected:
- 2006-07 Chevrolet Impala/Monte Carlo
- 2006-07 Buick Lucerne
- 2006-07 Cadillac DTS
- 2007 C/K trucks
TIP:Â A complete listing of vehicle/engine combinations is available on the TechLink website, under the Reference Guide tab.
After one of these vehicles is in the key-on/engine-off state for 10 seconds, the immobilizer sets a fuel injector disable flag. Once the fuel injectors are disabled, the two Tech 2 output control functions are disabled (fuel injector and starter relay).
A fuel injector balance test cannot be completed within 10 seconds. So, an alternative balance test procedure is required. Refer to this heading in SI: Fuel Injector Balance Test With Special Tool.
TIP:Â If the AFIT (see main article) is used on these vehicles, fuel pump operation can be controlled by the tester through the DLC. However, additional jumper harnesses must be installed to the operate the injectors.
TIP:Â The Fuel Pump Output Control on the Tech 2 will still work.
There are two ways to tell if the vehicle is affected:
1. Use the list on the TechLink website under Reference Guide.
2. When trying to use the affected Output Controls (if available), the return message "Fuel Enable Not Set For Theft Deterrent" will be displayed on the Tech 2.
Effective with TIS Data version 5.0 (May 1, 2006), the Fuel Injector Balance Test is removed from the Tech 2 for the vehicles mentioned above. Refer to Tech 2 version 26.004. The Starter Relay Output Control will also be removed.
- Thanks to Mark Stesney and David Schulte
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