New Holland 131 – ECU: Coolant Temperature Sensor Fault

The system has detected a fault related to the coolant temperature sensor or its connection. This sensor monitors the engine coolant temperature and sends data to the Engine Control Unit (ECU) to adjust fuel injection timing, control the cooling fan, and protect the engine from overheating. A fault can lead to poor fuel economy, black exhaust smoke, and potential engine overheating.

• T4.75
• T4.85
• T4.90
• T4.95
• T4.100
• T4.105
• T4.110
• T4.115
• T5.95
• T5.105
• T5.115
• T6.120
• T6.140
• T6.145
• T6.155
• T6.160
• T6.165
• T6.175
• T6.180
• T7.165
• T7.270
• T8.275
• T8.435
• T9
• TJ
• TM
• TS-A
• TC18
• TC21
• TC21D
• TC21DA
• T1510
• T1520
• T1530
• CX7080
• CX8080
• CX8090
• CR9060
• CR9070
• CR8.90
• CR9.90
• CR10.90
• 975
• 985
• 995
• 8060
• 8070
• TR70
• TX66
• W130B
• W170B
• W190B
• T4 Series
• T5 Series
• T6 Series
• T7 Series
• T8 Series
• TC Series
• T1500 Series
• CX Series
• CR Series
• Wheel Loaders
• Skid Steer Loaders
• Backhoe Loaders
• TM120
• TM190
• T6000 Series
• TL-A
• 1400
• 1500
• T2210

1. 1

   Check the engine coolant level, as a low coolant level can cause the sensor to give inaccurate readings

2. 2

   Inspect the sensor's wiring harness and connector for damage, corrosion, loose connections, or coolant leakage

3. 3

   Test the sensor's resistance with a multimeter (expected values: ~2000-3000 Ω at 20°C/68°F, and ~250-350 Ω at 80°C/176°F). An open circuit or out-of-range reading indicates a faulty sensor

4. 4

   Test the wiring by checking for a 5V reference voltage at the sensor's connector with the key on and sensor disconnected. Lack of voltage indicates a wiring or ECU issue

1. 1

   Cool engine and drain coolant

   Ensure the engine is completely cool to avoid burns and relieve cooling system pressure. Drain coolant from the radiator to bring the level below the sensor's location (typically near the thermostat housing or cylinder head).

2. 2

   Remove faulty sensor

   Disconnect the electrical wiring harness from the sensor. Use a wrench to carefully unscrew and remove the old sensor from the engine block.

3. 3

   Install new sensor

   Clean the threaded area on the engine block. Apply suitable thread sealant to the new sensor's threads (if not pre-applied). Screw the sensor in by hand to ensure correct threading, then tighten to the manufacturer's recommended torque specification. Do not overtighten.

4. 4

   Refill and bleed cooling system

   Reconnect the electrical connector. Refill the cooling system with the correct type of coolant to the proper level. Bleed the cooling system to remove any introduced air pockets.

5. 5

   Test and clear codes

   Start the engine, check for leaks around the new sensor, and monitor the temperature gauge for proper function. Clear the fault code from the ECU using a diagnostic tool if it does not clear automatically.