John Deere 000656.02 – ECU: Injector #6 Part Number Invalid

The Engine Control Unit (ECU) has detected that the electronic fuel injector installed in cylinder #6 has an incorrect part number or its calibration data has not been correctly programmed. Modern common rail fuel injectors require a unique calibration code (trim code or QR code) to be programmed into the ECU to ensure precise fuel delivery. This fault is typically triggered when an injector is replaced but the new calibration data is not written to the ECU, or if an incompatible injector is installed.

• 9560 STS
• 9660 STS
• 9670 STS
• 9760 STS
• 9770 STS
• 9860 STS
• S650
• S660
• S670
• S760
• S770
• 8130
• 8230
• 8230T
• 8330
• 8330T
• 8430
• 8530
• 9230
• 8225R
• 8245R
• 8270R
• 8295R
• 8320R
• 8335R
• 8345R
• 8370R
• 9370R
• 4930
• 4940
• R4038
• R4045
• R4060
• 7180
• 7250
• 8100
• 8200
• 260E
• 310E

1. 1

   Verify if a new or replacement injector was recently installed in the #6 cylinder.

2. 2

   Visually inspect the part number on the installed #6 injector to ensure it is compatible with the specific engine model.

3. 3

   Review service history to determine if the mandatory injector coding procedure was missed during a recent replacement.

4. 4

   Connect a diagnostic tool (e.g., Service ADVISOR or Jaltest) to read the programmed injector codes from the ECU and compare the code for cylinder #6 with the actual code printed on the injector body.

5. 5

   Inspect the injector wiring harness and connector for cylinder #6 for damage or loose connections that could corrupt data transfer.

1. 1

   Connect diagnostic tool

   With the ignition on but the engine off, connect a compatible diagnostic tool (e.g., John Deere Service ADVISOR or Cojali Jaltest) to the machine's diagnostic port.

2. 2

   Navigate to injector coding

   Access the engine control unit's functions and locate the parameter for 'Injector Coding' or 'Injector Calibration'.

3. 3

   Read existing codes

   Use the software to read the currently stored injector codes for all cylinders to establish a baseline.

4. 4

   Enter new injector data

   Select cylinder #6. Manually enter the John Deere part number, serial number, and the specific calibration code exactly as it appears on the new injector.

5. 5

   Program the ECU

   Verify that the entered information is correct, then execute the command to program the new data into the ECU.

6. 6

   Cycle power

   Once programming is successful, turn the ignition off and wait for at least 30 seconds to allow the ECU to store the new configuration.

7. 7

   Clear codes and verify

   Turn the ignition back on, clear all ECU fault codes, and start the engine. Let it warm up to normal operating temperature and re-scan to ensure fault 000656.02 does not reappear.