Injector Quantity Adjustment

INJECTOR QUANTITY ADJUSTMENT

The injector quantity adjustment, or classification of injectors describes the quantity, or fuel delivery characteristic of the injector. This will make it possible to match the ECM fuel delivery strategy to the mechanical characteristics of the injector within a more narrowly graduated range. Injector classification can only be performed with a scantool.

The fuel injectors used in this vehicle have a seven digit alphanumeric code, which allows the ECM to determine the fuel quantity characteristic of each injector.

When carrying out service procedures where the injectors are removed from the cylinder head, it is important to observe the original locations of each individual injector, as installing an original injector in the wrong location, vehicle driveability and smoking concerns could result.

If an injector(s) is replaced, or if there is any concern that an injector may not be installed in its original location, the injector quantity adjustment procedure must be performed with the scan tool in order to program the quantity classification (seven digit alphanumeric code) to the corresponding cylinder in the engine control module.

INJECTOR CLASSIFICATION PROCEDURE

NOTE: The engine must not be running for this procedure.

NOTE: If installing a new injector, make a note of the seven digit alphanumeric code. You will need to enter it into the scan tool during the Injector Quantity Adjustment procedure.

NOTE: Before performing this procedure, if the ECU has been replaced, or if any injector has been installed anywhere but its original location, make a note of the seven digit alphanumeric codes and the physical location of each injector. You will need to enter them into the scan tool during the Injector Quantity Adjustment procedure.

1. Turn ignition switch "ON".
2. Using a scantool, select ECU View, then MISCELLANEOUS FUNCTIONS.
3. Select Injector Quantity Adjustment, then NEXT.
4. If the ECU was replaced, the Injector EEPROM Location procedure must be performed. Select YES, then NEXT, and follow the directions on the scan tool. Otherwise, go to step 5.
5. Select the injector(s) that has been replaced, access the keyboard function, and type the seven digit alphanumeric code next to the cylinder number that corresponds to the physical location where the injector has been installed.
6. Click NEXT. The scan tool will prompt to turn the ignition switch off for 12 seconds.
7. Repeat step 5 and 6 for any other injectors that are new, or have been moved from their original location. Once injectors are classified, cycle ignition to complete.
8. Once the seven digit alphanumeric codes for all injectors have been entered into the ECU, cycle ignition to complete the procedure.