New Holland ENG 3695 – Engine ECU: Glow Plugs: Array of DFCs for Failure in Cylinder 1 Glow Plug

The engine control system has detected an electrical fault, open circuit, or failure specifically on the glow plug heating element or circuit for engine cylinder number 1.

• L125
• L140
• L150
• L160
• L170
• L175
• L213
• L215
• L218
• L220
• L223
• L225
• L230
• C175
• C227
• C232
• C238
• Boomer 2030
• Boomer 2035
• Boomer 3040
• Boomer 3045
• Boomer 4055
• Boomer 4060
• Boomer 8N
• TC33
• TC35
• TC40
• TC45
• T1510
• T1520
• T2210
• T2220
• SR130
• SR150
• SR175
• SV185
• Farmall / DX series

1. 1

   Visual Inspection: Inspect the wiring harness leading to the Cylinder 1 glow plug for chafing, melting, or disconnected terminals.

2. 2

   Resistance/Continuity Test: Disconnect the wire to the Cylinder 1 glow plug and measure the resistance of the plug to a good engine ground using a multimeter. An open circuit (infinite resistance) or unusually high resistance confirms a burned-out glow plug.

3. 3

   Voltage Test: Turn the key to the ON position (cold engine) and verify that the glow plug relay/module is sending 12V to the Cylinder 1 glow plug wire during the pre-heat cycle. If voltage is missing, the issue may lie in the wiring harness or the glow plug relay.

1. 1

   Disconnect Power

   Disconnect the negative battery cable to prevent accidental short circuits while working on the engine electrical system.

2. 2

   Locate Cylinder 1

   Identify Cylinder 1 on the engine block (typically the cylinder closest to the front of the engine/cooling fan).

3. 3

   Remove Electrical Connection

   Carefully remove the retaining nut or pull the electrical connector off the top of the Cylinder 1 glow plug.

4. 4

   Extract the Glow Plug

   Using a deep socket, carefully unscrew the glow plug from the cylinder head. Note: If the plug is seized, use a specialized glow plug dismantling aid/penetrating solvent to prevent breaking the plug off in the cylinder head.

5. 5

   Install New Glow Plug

   Apply a high-temperature anti-seize or specialized glow plug grease to the threads of the new glow plug. Thread it in by hand to prevent cross-threading, then tighten to the manufacturer's specified torque.

6. 6

   Reconnect

   Reattach the electrical wire and secure the retaining nut. Reconnect the negative battery cable.

7. 7

   Clear Codes and Test

   Use a diagnostic tool/CAN-bus eraser to clear the ENG 3695 fault code from the Engine ECU. Cycle the ignition to verify the cold-start pre-heat sequence operates normally and the code does not return.