Case IH 19699 – Engine Control Module (ECM): Set value of PCV not in plausibility range

The Engine Control Module (ECM) is commanding a specific fuel pressure setpoint, but the actual fuel rail pressure or the electrical feedback from the Pressure Control Valve (PCV) is outside the expected (plausible) range, indicating a discrepancy between commanded and actual pressure.

• Tier 4b
• Tier 4B engine models
• Puma series
• Maxxum series
• Vestrum series
• Farmall series

1. 1

   Check the low-pressure fuel circuit (lift pump, fuel lines, and filters) for restrictions or starvation.

2. 2

   Inspect the wiring harness and connector at the PCV on the high-pressure pump for chafed wires, corrosion, or loose pins.

3. 3

   Verify that the fuel rail pressure sensor is reading accurately and not sending incorrect pressure data to the ECM.

4. 4

   Check for internal high-pressure fuel leaks, such as a leaking pressure relief valve on the fuel rail or excessive injector return flow.

1. 1

   Replace Fuel Filters

   Replace the primary and secondary fuel filters, bleed the fuel system of all air, and test the machine under load to see if the code clears.

2. 2

   Repair Wiring

   If wiring damage is found at the PCV connector, repair the harness, clear the codes, and retest.

3. 3

   Replace the PCV

   If the low-pressure supply is verified good, no leaks are present, and the wiring is intact, remove the PCV from the high-pressure fuel pump and install a new one.

4. 4

   Reset Adaptations

   After replacing the PCV, use an electronic service tool (like CNH EST) to clear the fault codes and reset the EEPROM learning data/adaptations for the new valve.

5. 5

   Further Action

   If the fault persists after PCV replacement, the high-pressure fuel pump may have internal wear and require replacement, or the fuel rail pressure sensor may be faulty.