Case IH 19316 – DCU (Dosing Control Unit): UREA Temperature in Pump Module out of range | Urea temperature box - physical | Reagent-temperature sensor of pump module out of range

The system has detected that the temperature sensor located inside the Diesel Exhaust Fluid (DEF) Supply Module (Urea Pump) is reporting a temperature value that is outside the physically plausible operating range. This usually indicates a failed internal temperature sensor, a wiring harness issue (open or short circuit), or a failure in the pump's internal heating circuit causing the fluid to freeze or overheat.

• Tier 4a
• Tier 4b
• Magnum 235
• Magnum 260
• Magnum 290
• Magnum 315
• Magnum 340
• Steiger 350
• Steiger 400
• Steiger 450
• Steiger 500
• Steiger 550
• Steiger 600
• Quadtrac 350
• Quadtrac 400
• Quadtrac 450
• Quadtrac 500
• Quadtrac 550
• Quadtrac 600
• Puma 210
• Patriot 4430
• Axial-Flow 7230
• Axial-Flow 8230
• Axial-Flow 9230

1. 1

   Check for related electrical codes (19055, 19056, 19057, or 19058) which point directly to a hard electrical failure.

2. 2

   Inspect the main electrical harness connecting to the DEF Supply Module for backed-out pins, corrosion, or chafed wires.

3. 3

   Connect the CNH Electronic Service Tool (EST) and monitor the 'Urea Pump Module Temperature' parameter. If it reads an impossible default value (e.g., -40°C or +150°C) at normal ambient temperature, the internal sensor has failed.

4. 4

   Check the engine coolant lines running to the DEF pump module. Ensure they are hot when the engine is at operating temperature, as a frozen pump will cause the sensor to read out of range.

1. 1

   Preparation

   Turn off the machine and disconnect the battery. Wait at least 5-10 minutes after key-off to allow the DEF system to purge fluid back into the tank.

2. 2

   Disconnect Coolant Lines

   Clamp off the engine coolant lines running to the DEF pump module to prevent coolant loss, then disconnect them.

3. 3

   Disconnect DEF Lines

   Disconnect the DEF inlet, outlet, and backflow lines. Note: DEF is highly corrosive. Immediately wash away any spilled DEF with warm water to prevent damage to surrounding metal and wiring.

4. 4

   Disconnect Electrical

   Unplug the main electrical harness from the DCU to the pump module.

5. 5

   Remove the Pump

   Unbolt the DEF Supply Module from its mounting bracket (often located near the DEF tank or on the frame rail) and remove it from the machine.

6. 6

   Install New Module

   Mount the replacement DEF Supply Module.

7. 7

   Reconnect

   Reattach the DEF lines, coolant lines, and electrical connector. Ensure all fittings click securely into place.

8. 8

   Refill and Prime

   Top off any lost engine coolant. Turn the key to the ON position to allow the system to prime.

9. 9

   Clear Codes and Test

   Use the CNH EST diagnostic tool to clear fault code 19316. Run a dynamic DEF leak test or dosing quantity test to command the pump to build pressure (typically around 9 bar / 130 psi) and verify the temperature reading is now accurate.