Case IH 3702 – ENGINE ECU (EDC - Electronic Diesel Control module): Injection control: Detection of Failed Engine Start

This code is triggered when the engine fails to start because it cannot maintain a sufficient starting speed or because there is insufficient fuel rail pressure. The system detects that the parameters required for a successful engine start (cranking RPM and minimum fuel pressure) have not been met.

• Farmall
• Puma
• Maxxum
• Magnum
• Steiger
• 2300 series
• 2500 series
• 2388
• 2588
• L series loaders
• C series loaders

1. 1

   Fuel Supply Pressure Test: Check the low-pressure fuel system. Vacuum between the inlet of the low-pressure lift pump and the fuel tank should not exceed 127 mm (5 inches) of Hg.

2. 2

   High-Pressure Test: Fuel supply pressures between the fuel filter and the inlet to the high-pressure injection pump should be a minimum of 5 bar (72 psi) during cranking/loaded/unloaded states.

3. 3

   Rail Pressure Check: Monitor the fuel rail pressure sensor via a diagnostic tool to ensure minimum rail pressure is being achieved during cranking.

4. 4

   Engine Speed Check: Verify that the engine speed sensor (crankshaft/camshaft) is reading a sufficient and steady RPM signal while the engine is cranking.

5. 5

   Visual & Physical Inspections: Check for severe fuel leaks, air intrusion in the fuel lines, and inspect the fuel filters for water or heavy clogging.

1. 1

   Verify Fuel Quality and Level

   Ensure the tank has adequate, uncontaminated diesel fuel.

2. 2

   Service Fuel Filters

   Replace both the primary and secondary fuel filters if they are clogged or if water is present.

3. 3

   Bleed the Fuel System

   Purge any trapped air from the fuel lines, as air intrusion will prevent the rail from building minimum pressure.

4. 4

   Test and Replace the Lift Pump

   If the low-pressure vacuum/pressure tests fail (cannot maintain 5 bar / 72 psi), replace the fuel lift pump.

5. 5

   Test and Replace the Rail Pressure Sensor / Relief Valve

   If low-pressure supply is good but the rail is not building pressure, test the fuel rail pressure sensor and the pressure relief valve. Replace if faulty.

6. 6

   Inspect Engine Speed Sensors

   If fuel pressure is adequate but the engine still fails to register starting speed, inspect the wiring harness and replace the engine speed sensor.

7. 7

   Clear Codes

   Once the faulty component is replaced and the engine starts, clear the EDC fault codes using a diagnostic tool.