• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis

Fuel injectors are solenoid valves that inject fuel either into the intake system or directly into the cylinder. The amount of fuel injected depends on the length of the electrical pulse that is applied.

The injector flow rate identifier is stored in the engine control module. This identifier is written on the injector and indicates the actual flow rate for this specific injector. This is used to compensate manufacturing tolerances of the injectors.

The injector flow rate programming must be performed if one or more of the following components have been replaced:

• K20 Engine Control Module
• Q17 Fuel Injector

Option Note: Taking pictures of injector flow identifier information located on top of each fuel injector prior to installation is recommended Injector Flow Identifier(1)—Record the Injector Flow Identifier information from all injectors. Option Note: Scanning of QR Codes is not always reliable, only use if unable to read injector flow identifier QR Code(2)»Scan with smartphone or suitable device Injector Flow Identifier=Digit 42−65, 68, 69 Note: Bold text=Digit 42−65, 68, 69 *For example:QR Code=DXD316274609551267899200001741609929234F7FD18FCFBFFF3FD02F8FFFE05001A—Select:Injector Flow IdentifierDigit 42−65, 68, 69=FD18FCFBFFF3FD02F8FFFE051A

Control Module References

Note: This procedure is only for control modules that cannot communicate and injector replacement.

1. Perform the following action:
• {Q17 Fuel Injector—Replaced}Record the Injector Flow Identifier information from the new injectors.
• {K20 Engine Control Module—Replaced}Record the Injector Flow Identifier information from all injectors.
2. Ignition » On / Vehicle » In Service Mode
3. Select:Module Diagnostics
4. Select:Engine Control Module
5. Select:Configuration/Reset Functions
6. Select:Injector Flow Rate Programming
7. Select:Cylinder 1–8 Injector Flow Identifier
8. Enter the recorded injector flow identifier for each injector.

   Verify the scan tool procedure was successful.

• If the procedure was not successful

  Repeat step 1

• If the procedure was successful
9. All OK.

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

For control module replacement, programming, and setup refer to:Control Module References