New Holland 3102 – ECU: Fuel Pressure Monitoring CP3 - ALL OTHER FAULTS

The Engine Control Unit (ECU) has detected that the Bosch CP3 high-pressure fuel pump is not building or maintaining the commanded fuel pressure. This is a general fault indicating that the system recognizes incorrect pressure, but it has not pinpointed a specific electrical failure (such as a sensor signal being too high or low). As a result of this pressure drop, the engine may enter a limp mode with reduced power to prevent damage.

• T6000 Series
• T6020
• T6030
• T6050
• T7000 Series
• T7030
• T7040
• T7050
• T7060
• T6 Series
• T7 Series
• Auto Command variants
• Power Command variants
• Various backhoe loaders
• agricultural equipment using FPT engines with CP3 pumps

1. 1

   Check for other fault codes related to fuel pressure sensors (e.g., 3103, 3104), injector circuits, or CAN communication that could provide diagnostic clues

2. 2

   Inspect fuel quality and supply, ensuring adequate fuel level and checking the tank for debris or water contamination

3. 3

   Inspect the primary fuel filter and water separator bowl for dirt, water, or algae, as a restricted filter is a primary cause of low pressure

4. 4

   Check for air entering the fuel system, which often occurs after a filter change or from a leak on the suction side

5. 5

   Visually inspect all fuel lines, high-pressure lines, and injector connections for external fuel leaks

6. 6

   Test the Pressure Relief Valve (PRV) by disconnecting the return line and routing it to a container; no fuel should flow at idle (flow indicates a faulty valve)

7. 7

   Check injector return flow using a specialized tool; excessive leakage from one or more injectors can cause overall rail pressure to drop

8. 8

   Monitor rail pressure with a diagnostic tool by comparing 'Desired' vs 'Actual' pressure; they should match at idle, and cranking pressure should reach approximately 4,000 PSI

1. 1

   Replace fuel filter

   Close the fuel shut-off valve and clean the filter housing area. Remove the old filter and install a new OEM filter, pre-filling it with clean diesel fuel before installation.

2. 2

   Bleed the fuel system

   Open the fuel shut-off valve and locate the bleeder screw. Use the hand priming pump until a solid stream of fuel with no air bubbles emerges, then tighten the screw. Crank the engine in short bursts to purge remaining air. If it won't start, cautiously loosen high-pressure lines at the injectors one at a time while cranking.

3. 3

   Remove faulty CP3 pump

   If diagnostics confirm a failed pump, disconnect batteries and clean the engine area. Relieve fuel pressure, disconnect all fuel lines and the metering unit electrical connector (cap openings immediately). Remove the drive gear access cover, drive gear nut, and mounting nuts to extract the pump.

4. 4

   Install new CP3 pump

   Transfer the drive gear to the new pump if required, ensuring the shaft is clean and dry. Lubricate the new mounting flange O-ring with clean engine oil. Install the pump, install the mounting nuts finger-tight, and perform a preliminary tightening of the drive gear nut to seat the pump. Torque mounting nuts and drive gear nut to OEM specs, reconnect all fuel lines using new sealing washers on banjo bolts, reconnect the electrical connector, and thoroughly bleed the system.