Case IH 3696 – Engine Control Unit (ECU) / EDC: Failure in Cylinder 2 Glow Plug Circuit

Fault code 3696 indicates a failure in the glow plug circuit for Cylinder 2.

• skid steer
• Case IH SR250
• Case IH TR270
• Case IH Farmall series (65A, 75A, 105A, 115A)
• Case IH JX series (JX60 to JX100U)
• Case IH Quantum series
• Case IH AVJ/VJ series

1. 1

   Inspect the wiring harness and connector leading to the cylinder 2 glow plug for chafing, corrosion, or disconnection.

2. 2

   Test the cylinder 2 glow plug circuit for an open load, short circuit to ground, or short circuit to the battery.

3. 3

   Measure the resistance of the cylinder 2 glow plug itself using a multimeter. An open circuit (infinite resistance) confirms the heating element inside the plug has failed.

4. 4

   Verify there are no accompanying codes for the Glow Plug Control Unit (such as code 3692 for power stage overtemperature or 3689 for communication errors), which would indicate a module failure rather than a faulty plug.

1. 1

   Disconnect Power

   Disconnect the negative battery cable to prevent electrical shorts while working on the engine.

2. 2

   Locate the Component

   Locate the glow plugs on the engine cylinder head. Identify the glow plug for cylinder 2 (cylinders are typically numbered sequentially from the front of the engine).

3. 3

   Remove the Connector

   Carefully unplug the electrical connector or remove the retaining nut securing the wire to the cylinder 2 glow plug.

4. 4

   Clean the Area

   Thoroughly clean the area around the base of the glow plug to prevent dirt or debris from falling into the open cylinder bore.

5. 5

   Remove the Glow Plug

   Using an appropriate deep socket, carefully unscrew and extract the faulty glow plug.

6. 6

   Install the New Plug

   Thread the new glow plug in by hand to prevent cross-threading, then tighten it to the manufacturer's specified torque.

7. 7

   Reassemble

   Reattach the electrical connector/wire to the new glow plug and reconnect the battery.

8. 8

   Clear Codes

   Use a diagnostic service tool to clear the inactive 3696 fault code from the EDC and cycle the ignition to ensure the code does not return.