Case IH P19 – Engine Control Unit (ECU) / Engine Management System: Fuel Quantity Shut-Off, Data Valid But Above Normal Range

The control module is receiving a readable, valid data signal from the fuel quantity shut-off solenoid/valve, but the electrical value (typically voltage or resistance) is registering higher than the maximum threshold of the normal operating range. This usually points to a failing solenoid coil (increasing resistance), a partial short to a high-voltage source, or a wiring harness issue. Note: Fault code P19 is listed as 'Not used' in transmission and steering calibration guides; the description corresponds to Engine Error Code T19.

• MXM
• MXM120
• MXM130
• MXM140
• MXM155
• MXM175
• MXM190
• MX Series
• TG Series
• Maxxum
• 5120
• 5140
• 5150
• 7100 Series
• 9100 Series

1. 1

   Verify the Code: Confirm on the digital instrument cluster that the code is T19 (Engine) rather than P19 (which is an unused transmission/steering slot).

2. 2

   Inspect the Wiring Harness: Check the wiring leading to the fuel shut-off solenoid on the injection pump. Look for chafed wires that might be shorting to a high-voltage source (which would trigger the 'Above Normal Range' parameter).

3. 3

   Check the Connector: Disconnect the solenoid pigtail and check for corrosion, water ingress, or bent pins that could skew the data signal.

4. 4

   Test the Solenoid: Use a multimeter to check the voltage reaching the solenoid (should be a standard 12V signal). Test the internal resistance of the solenoid coil; if it is out of spec, the solenoid is failing internally.

1. 1

   Disconnect Power

   Disconnect the tractor's battery to prevent electrical spikes during the repair.

2. 2

   Locate the Valve

   Locate the fuel shut-off solenoid, typically mounted directly on the fuel injection pump.

3. 3

   Remove the Faulty Solenoid

   Unplug the electrical connector. Unbolt and carefully remove the solenoid from the pump housing. Be prepared to catch a small amount of diesel fuel.

4. 4

   Install the New Part

   Clean the mounting surface. Install the new 12V fuel shut-off solenoid and tighten to OEM torque specs.

5. 5

   Reconnect

   Plug the electrical connector back in, ensuring the weather seal is intact.

6. 6

   Clear Codes and Test

   Reconnect the battery, turn the ignition on to clear the stored T19 fault code, and start the engine to ensure the fuel shut-off valve operates correctly and the code does not return.