New Holland 3007 – ECU: Coolant Temp Sensor Signal Above Range

The Engine Control Unit (ECU) has detected a voltage signal from the coolant temperature sensor circuit that exceeds the maximum acceptable threshold. This typically indicates an electrical fault, such as an open circuit or a short to a power source, causing the signal voltage to read abnormally high. An incorrect high-temperature signal can cause the ECU to falsely detect an overheating condition, potentially resulting in reduced engine power (limp mode), continuous cooling fan operation, poor fuel economy, and incorrect fuel mixture adjustments.

• T5 Series
• T6 Series
• T7 Series
• T5.95
• T5.105
• T5.115
• T1510
• T1520
• T1530
• T2210
• T2220
• T2310
• T2320
• TT45A
• TT50A
• L160
• L170
• L175
• L180
• L185
• L190
• L218
• L220
• L223
• L225
• L230
• C185
• C190
• C227
• C232
• C238
• B90B
• B95
• B95B
• B110
• B110B
• B115
• B115B
• LB75.B
• LB90.B
• LB110.B
• LB115.B
• LM Series
• M Series
• W110
• W130
• BOOMER 2030
• BOOMER 2035
• BOOMER 3040
• BOOMER 3045
• WORKMASTER 45
• WORKMASTER 55
• 1320
• 1520
• 1530
• 1620
• 1630
• 1920
• 1925
• 2120
• 3415

1. 1

   Inspect the wiring harness and connectors between the ECU and the coolant temperature sensor for damage, corrosion, abrasion, or improper connections.

2. 2

   Ensure the engine coolant is at the proper level, as low coolant can cause air pockets that prevent the sensor from reading accurately.

3. 3

   Clear the fault codes and operate the machine to see if fault 3007 reappears, which helps determine if the issue is intermittent.

4. 4

   With the key in the 'ON' position (engine off), disconnect the sensor and use a multimeter to verify a 5.0 V reference from the ECU on one pin and a proper ground reference on the other.

1. 1

   Test sensor resistance

   Ensure the engine is completely cool. Disconnect the sensor and measure resistance across its two pins. Compare to manufacturer specifications (e.g., 153.9 Ohms at 122°F / 50°C and 27.4 Ohms at 212°F / 100°C). An open circuit (infinite resistance) or out-of-range reading indicates a failed sensor. You can also test the sensor by removing it and placing it in water of a known temperature while measuring the resistance to verify its accuracy.

2. 2

   Test wiring harness

   If the sensor tests within specification, turn the key switch off and disconnect both the sensor and ECU connectors. Check for an open circuit in the signal and ground wires (resistance should be less than 10 Ohms). Also, check for a short to ground or power in the signal wire.

3. 3

   Replace coolant temperature sensor

   If the sensor is faulty, allow the engine to cool and relieve cooling system pressure. Place a catch pan underneath, remove the old sensor, clean the mounting boss threads, apply coolant-rated thread sealant to the new sensor, install, and tighten it to the proper specification. Reconnect wiring, top off coolant, start the engine, check for leaks, and allow the engine to reach operating temperature while monitoring the temperature gauge and checking for any new fault codes.