Case IH ENG241 – ECU: Vehicle Speed Signal Lost

The Engine Control Unit (ECU) has detected that the vehicle speed signal is not being received. The vehicle speed sensor provides essential data for the speedometer, transmission shift control, and other systems that rely on ground speed for proper function. The absence of this signal can lead to an inoperative speedometer, erratic or incorrect gear shifting, and the inability to shift into higher gears.

• Magnum 180
• Magnum 200
• Magnum 215
• Magnum 220
• Magnum 225
• Magnum 235
• Magnum 240
• Magnum 245
• Magnum 250
• Magnum 255
• Magnum 275
• Magnum 280
• Magnum 290
• Magnum 305
• Magnum 310
• Magnum 315
• Magnum 335
• Magnum 340
• Magnum 370
• Magnum 380
• Magnum 7250
• Magnum 8950
• Magnum MX210
• Magnum MX230
• Magnum MX255
• Magnum MX305
• Maxxum 115
• Maxxum 125
• Maxxum 135
• Maxxum 145
• Maxxum 150
• Maxxum JX
• Maxxum MX
• Maxxum MXM
• Maxxum 5120
• Maxxum 5130
• Maxxum 5140
• Maxxum 5250
• Puma 150
• Puma 165
• Puma 185
• Puma 200
• Puma 215
• Puma 220
• Puma 230
• Puma 240
• Steiger 385
• Steiger 435
• AFX8010

1. 1

   Visually inspect the wiring harness leading to the vehicle speed sensor for cuts, abrasions, melting, or fraying, particularly near moving parts or heat sources.

2. 2

   Disconnect the sensor and inspect the electrical connector for corrosion, bent or pushed-back pins, and ensure it is securely latched.

3. 3

   For active (Hall effect) sensors: Use a multimeter to check for correct voltage at the sensor's power supply wire with the key on, and verify the ground wire has low resistance (less than 5 Ohms) to a known good chassis ground.

4. 4

   For passive (magnetic) sensors: Disconnect the sensor and measure resistance across its terminals. Expected resistance is typically 2700 to 3300 Ohms (2925 to 3575 Ohms for Magnum 7250/8950 models). An open circuit (OL) or out-of-range reading indicates a faulty sensor.

1. 1

   Locate the sensor

   Find the vehicle speed sensor on the drivetrain. Common locations include the top cover of the transmission or range transmission (often above the differential ring gear), the rear axle housing, directly in front of the right rear axle going into the side of the transmission (e.g., Case 125 Maxxum), or vertically above the rear differential.

2. 2

   Remove the sensor

   Disconnect the electrical connector. Clean the area around the sensor to prevent debris from entering the housing. Remove the securing bolt(s) and carefully pull the sensor out.

3. 3

   Inspect the sensor tip

   Check the tip of magnetic sensors for metallic debris. An accumulation of metal filings can indicate internal component wear or failure, such as from the brake discs.

4. 4

   Install the new sensor

   Lightly lubricate the new O-ring with clean transmission fluid or grease. Insert the new sensor into its mounting hole and secure it with the retaining bolt(s).

5. 5

   Reconnect and test

   Securely connect the wiring harness to the new sensor. Start the tractor and check if the ENG241 fault code has cleared and if the speedometer is functioning correctly. A diagnostic scan tool may be required to clear stored fault codes.