Case IH 3586 – Engine Control Unit (ECU / EDC) or Dosing Control Unit (DCU): Plausibility check of catalyst system - Temperature after Catalyst not plausible

This code indicates that the exhaust gas temperature (EGT) sensor located downstream (after) the Selective Catalytic Reduction (SCR) catalyst is sending a reading that does not make logical sense to the engine's computer. The temperature is either outside the expected operational model or does not align plausibly with the readings from the upstream temperature sensor.

• Magnum 235
• Magnum 260
• Magnum 290
• Magnum 315
• Magnum 340
• Puma 130
• Puma 140
• Puma 145
• Puma 170
• Puma 185
• Puma 200
• Puma 215
• Puma 220
• Puma 230
• Puma 240
• Maxxum 120
• Maxxum 125
• Maxxum 130
• Maxxum 140
• Maxxum 150
• Steiger 350
• Steiger 370
• Steiger 400
• Steiger 420
• Steiger 450
• Steiger 470
• Steiger 500
• Steiger 540
• Steiger 550
• Steiger 580
• Steiger 600
• Steiger 620
• Quadtrac 350
• Quadtrac 370
• Quadtrac 400
• Quadtrac 420
• Quadtrac 450
• Quadtrac 470
• Quadtrac 500
• Quadtrac 540
• Quadtrac 550
• Quadtrac 580
• Quadtrac 600
• Quadtrac 620
• Rowtrac 350
• Rowtrac 370
• Rowtrac 400
• Rowtrac 420
• Rowtrac 450
• Rowtrac 470
• Rowtrac 500
• Rowtrac 540
• Rowtrac 550
• Rowtrac 580
• Rowtrac 600
• Rowtrac 620
• Optum 270
• Optum 300
• Farmall 100C
• Farmall 105U
• Farmall 110A
• Farmall 115U
• Farmall 120U
• Farmall 130A
• Farmall 140A
• Combine 5130
• Combine 5140
• Combine 7130
• Combine 7140
• Combine 7230
• Combine 7240
• Combine 9230
• Combine 9240

1. 1

   Inspect the wiring harness and connector leading to the downstream exhaust gas temperature sensor for chafing, melting from exhaust heat, corrosion, or loose pins.

2. 2

   Check the exhaust system for any leaks between the engine and the SCR catalyst, as escaping exhaust gas can cause the downstream sensor to read lower-than-expected temperatures.

3. 3

   Verify the sensor's resistance and voltage using a multimeter to determine if the sensor has failed electrically.

4. 4

   Ensure the SCR catalyst itself is not physically damaged or clogged.

1. 1

   Cool Down

   Ensure the machine is turned off and the exhaust system has completely cooled down to prevent severe burns.

2. 2

   Locate Sensor

   Locate the exhaust gas temperature sensor on the exhaust system. For code 3586, you must locate the sensor positioned after (downstream of) the SCR catalyst.

3. 3

   Disconnect

   Disconnect the electrical connector from the sensor harness.

4. 4

   Remove

   Using the appropriate wrench, loosen the hex nut securing the sensor and carefully unthread the sensor from the exhaust pipe.

5. 5

   Prep New Sensor

   Apply a small amount of high-temp anti-seize compound to the threads of the new sensor (if not pre-applied by the manufacturer). Be extremely careful not to get any anti-seize on the sensor probe itself.

6. 6

   Install

   Thread the new sensor into the exhaust system and tighten securely.

7. 7

   Reconnect

   Reconnect the electrical connector, ensuring it clicks firmly into place.

8. 8

   Clear Codes

   Turn on the machine and use a diagnostic scan tool to clear fault code 3586. Run the engine up to operating temperature to verify the code does not return.