John Deere 656.02 – Engine Control Unit (ECU): Injector #6 Part # Data Invalid

The Engine Control Unit (ECU) does not recognize the calibration code (trim code) or part number data entered for the fuel injector installed in cylinder number 6. This commonly happens if an injector was recently replaced but not programmed into the system, or if the ECU's memory regarding that injector's calibration data has become corrupted.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7630
• 7730
• 7830
• 7930
• 7810
• 8310RT
• 8335RT
• 8360RT
• 9200
• 9300
• 9400
• 744H
• 744MH
• 350GLC
• 380GLC

1. 1

   Restart the machine to verify if the active Diagnostic Trouble Code (DTC) reappears, as resetting communication messages may clear it.

2. 2

   Verify recent service history to see if the fuel injector on cylinder #6 was recently replaced without programming the new calibration code.

3. 3

   Check for accompanying cylinder #6 codes (e.g., 656.05 for high resistance/open circuit, or 656.06 for low resistance/short circuit) that might indicate a wiring issue rather than a data issue.

1. 1

   Connect diagnostic software

   Connect the diagnostic software to the machine's diagnostic port.

2. 2

   Inspect fuel injector

   Physically inspect the fuel injector installed in cylinder #6 and write down the calibration code (trim code/QR code) printed on the injector body.

3. 3

   Access ECU programming menu

   Access the Engine ECU programming menu via the diagnostic tool and navigate to the injector calibration section.

4. 4

   Compare calibration codes

   Compare the physical code on the injector to the code currently programmed in the ECU for cylinder #6.

5. 5

   Enter calibration code

   If the code is missing, invalid, or mismatched, manually enter the correct calibration code into the ECU.

6. 6

   Replace and program injector

   If the injector itself is faulty and requires replacement, remove the old injector, install the new one, and program the new injector's specific trim code into the ECU.

7. 7

   Clear codes and verify

   Clear the fault codes, restart the engine, and verify that code 000656.02 does not return.