Case IH ENG273 – ECU: Rear Pumping Control Valve Current Is Low During Click Test

The Engine Control Module (ECM) has detected an open circuit or abnormally low current on the rear pumping control valve return circuit (specifically Pin 15) during its diagnostic 'click test'. The rear pumping control valve is a critical component of the CAPS (Cummins Accumulator Pump System) fuel pump, responsible for pumping fuel into the accumulator and maintaining desired fuel pressure.

• 7110
• 8930
• MX215
• MX240
• MX255
• MX270
• MX285
• MX305
• MX Series
• TG Series

1. 1

   Visually inspect the wiring harness and connectors associated with the fuel injection pump and rear pumping control valve for damage, corrosion, or loose connections

2. 2

   Check for an open circuit or high resistance in the wiring between the ECU and the rear pumping control valve

3. 3

   Test the rear pumping control valve solenoid to ensure it is functioning correctly

1. 1

   Visual Inspection

   Carefully inspect the wiring harness and connectors associated with the fuel injection pump and the rear pumping control valve. Look for any signs of damage, corrosion, or loose connections.

2. 2

   Check Circuit Integrity

   Use a digital multimeter to check for continuity and resistance in the wiring between the ECU and the rear pumping control valve. For MX240 models, specifically check for an open circuit at pin A15 of the engine controller.

3. 3

   Test Valve Solenoid

   Measure the resistance of the rear pumping control valve solenoid coil and compare it to the manufacturer's specifications to determine if the solenoid is faulty.