Case IH 19563 – Engine Control Module (ECM) / Vehicle Control Module (VCM) / EDC17C49: Error detection and healing of MAX error of lambda plausibility test

The engine's Lambda (Oxygen/O2) or NOx sensor has failed a plausibility check by registering a 'MAX error.' The measured value exceeds the maximum allowed threshold and is deemed implausible.

• Tier 4b
• Puma (140-240)
• Optum (250-300)
• Magnum
• Maxxum EP Tier 4
• Farmlift (632, 735, 742, 935)
• N-Series TLBs
• T7 Series (T7.165 through T7.315)
• Workmaster series

1. 1

   Check for external factors such as exhaust leaks, intake issues, or EGR malfunctions causing artificially high oxygen/NOx readings.

2. 2

   Inspect the sensor's wiring harness and its 5-pin connector for corrosion, damage, or short circuits.

3. 3

   Connect the Case IH Electronic Service Tool (EST) or FPT Engine Troubleshooting software to observe the live physical signal of the Lambda/NOx sensor and confirm it is reading out of bounds.

4. 4

   If the wiring is intact and the reading remains implausible, verify sensor accuracy as the sensor itself has likely failed.

1. 1

   Prepare the machine for maintenance

   Move the machine to a secure, level maintenance area and ensure the exhaust system has completely cooled down to prevent burns.

2. 2

   Read and save the fault code report

   Using the Case IH EST or FPT diagnostic software, read and save the fault code report.

3. 3

   Locate the faulty sensor

   Locate the faulty Lambda/NOx sensor on the exhaust after-treatment system (ATS).

4. 4

   Disconnect the wiring harness

   Disconnect the 5-pin wiring harness connector from the sensor.

5. 5

   Remove the faulty sensor

   Carefully unscrew and remove the faulty sensor from the exhaust pipe/manifold.

6. 6

   Install the new sensor

   Install the new genuine replacement sensor, ensuring the threads are properly seated.

7. 7

   Reconnect the wiring harness

   Reconnect the 5-pin wiring harness.

8. 8

   Clear the fault code and reset counters

   Reconnect the diagnostic tool, clear the 19563 fault code, and reset any associated counters.

9. 9

   Verify the repair

   Run the engine and monitor the live data to ensure the Lambda/NOx plausibility test passes and the code does not return.