Case IH 3493 – Engine Control Unit (ECU): Missing adjustment value programming for injector in cylinder 2

This code indicates that the engine control module has lost or is missing the specific calibration code (often called an IQA, trim, or QR code) for the fuel injector installed in cylinder 2. Because every fuel injector has slight manufacturing variances, a unique adjustment value is printed on the injector body. The engine computer needs this value to properly balance fuel delivery and ensure smooth engine operation.

• Steiger T4B
• 240 Series Axial-Flow Combines (7240, 8240, 9240)
• Steiger Tractors (385, 435, 450)
• Magnum Tractors
• NEF 4
• NEF 6
• Cursor 9
• Cursor 11
• Cursor 13
• Cursor 16

1. 1

   Verify Recent Service History: Check if the fuel injector in cylinder 2 was recently replaced. If a new injector was installed but not programmed into the ECU, this code will trigger.

2. 2

   Check ECU Status: Determine if the Engine ECU was recently flashed, replaced, or suffered a voltage drop that may have caused it to lose its programmed memory.

3. 3

   Locate the Calibration Code: Physically inspect the fuel injector installed in cylinder 2. Locate the alphanumeric calibration/trim code (or QR code) printed on the top or side of the injector body.

1. 1

   Connect diagnostic tool

   Connect the Case IH Electronic Service Tool (EST) (with an approved DPA5 diagnostic adapter) to the machine's CAN BUS diagnostic port.

2. 2

   Turn ignition ON

   Turn the machine's ignition key to the ON position (engine off).

3. 3

   Establish communication

   Launch the CNH EST software and establish communication with the Engine Control Unit (ECU).

4. 4

   Navigate to coding section

   Navigate to the ECU Programming / Injector Coding section (often found under the E.A.S.y engine diagnostic tool interface within EST).

5. 5

   Input calibration code

   Select Cylinder 2 and input the exact calibration/trim code printed on the physical injector body.

6. 6

   Save configuration

   Save the configuration to the ECU.

7. 7

   Clear fault codes

   Clear the active fault codes (3493 / F376).

8. 8

   Verify repair

   Cycle the ignition key off, wait 30 seconds, and turn it back on to verify the fault code does not return.