New Holland ENG 3691 – Engine ECU: Glow Plugs: No load error for Low Voltage System

The engine control module is detecting an open circuit or a lack of electrical load on the glow plug circuit.

• L218
• L220
• L223
• L225
• L315
• L320
• L325
• L328
• L330
• L334
• C227
• C232
• C327
• C332
• C337
• C338
• C345
• SR130
• SR160
• SR175
• CX720
• T4.110F
• 695SV Loader/Excavator

1. 1

   Test the wires leading to the glow plugs to ensure there are no breaks or bad connections.

2. 2

   Check the glow plug relays and fuses (often located in the rear fuse box or main mounting bracket) to ensure a relay hasn't failed or a fuse hasn't blown.

3. 3

   Test the glow plugs themselves to see if they are worn out or have an open internal circuit.

1. 1

   Inspect wiring

   Inspect the wiring connections leading to the glow plugs.

2. 2

   Remove faulty glow plugs

   If the wiring and connections are functioning properly but the code persists, remove the faulty glow plugs.

3. 3

   Install new glow plugs

   Install new glow plugs to restore proper cold-weather starting and clear the open circuit fault.

4. 4

   Replace relay

   If the relay is found to be defective during diagnostics, replace the glow plug relay.