Case IH 3175 – ENGINE: Exhaust Gas Temperature 1 Sensor Signal Too Low / DPF Intake Temperature Sensor Low Voltage

The engine control system is receiving a voltage signal from the primary exhaust gas temperature (EGT) sensor that has fallen below the minimum acceptable threshold, which typically points to a short to ground, an open circuit, or a completely failed sensor.

• skid steer
• Skid Steer Loaders (SSL)
• Compact Track Loaders (CTL)
• SR175
• SR270
• SV300
• SV340
• TR320
• Tractors
• Steiger
• Farmall
• Farmall 100C
• Farmall 105A
• Farmall 110U
• Farmall 115C
• Maxxum
• Puma
• Optum
• Quadtrac

1. 1

   Verify if fault code 3175 is active. If other voltage-related or CAN bus codes are present (e.g., 3179, 3180), diagnose those first as they may indicate a broader harness issue.

2. 2

   Inspect the wiring harness and connectors leading to the Exhaust Gas Temperature 1 / DPF Intake Temperature sensor for physical damage, melted wires, or corrosion that could cause a low voltage reading or short to ground.

3. 3

   Test the sensor's voltage output to confirm if the signal is falling below the minimum acceptable threshold.

1. 1

   Locate the sensor

   Locate the Exhaust Gas Temperature 1 Sensor (also referred to as the DPF Intake Temperature Sensor), which is mounted on the exhaust manifold or at the inlet of the Diesel Particulate Filter (DPF).

2. 2

   Disconnect the electrical plug

   Disconnect the electrical plug (often a 2-pin Bosch-style connector).

3. 3

   Unthread the faulty sensor

   Unthread the faulty sensor from the exhaust pipe/DPF housing.

4. 4

   Install the replacement sensor

   Install the replacement sensor (e.g., M14x1.5 thread).

5. 5

   Reconnect the wiring harness

   Reconnect the wiring harness.

6. 6

   Clear fault codes and verify

   Use a diagnostic tool (like the EST) to clear the fault codes and run the engine to verify the exhaust temperature is reading correctly and the code does not return.