New Holland 13022 – INST: Transmission Oil Temperature Sensor Voltage Too High

The voltage signal from the transmission oil temperature sensor is above the normal operating range. The Instrumentation (INST) controller interprets this high voltage condition as an open circuit in the sensor's wiring or a short circuit to a positive voltage source (+V). When active, the system cannot accurately monitor the transmission oil temperature, which may trigger a dashboard warning light and affect proper transmission management.

• T6.120
• T6.140
• T6.145
• T6.150
• T6.155
• T6.160
• T6.165
• T6.175
• T6.180
• T7.165
• T7.170
• T7.175
• T7.185
• T7.190
• T7.200
• T7.210
• T7.220
• T7.225
• T7.230
• T7.235
• T7.245
• T7.250
• T7.260
• T7.270
• T6020
• T6030
• T6050
• T6070
• T6080
• T6090
• T7030
• T7040
• T7050
• T7060
• T7070
• TM115
• TM120
• TM125
• TM130
• TM135
• TM140
• TM150
• TM155
• TM165
• TM175
• TM190
• TS90
• TS100
• TS110
• TS115
• TS100A
• TS110A
• TS115A
• TS125A
• TS135A
• TL70
• TL80
• TL90
• TL100
• 5640
• 6640
• 7740
• 7840
• 8240
• 8340
• 8160
• 8260
• 8360
• 8560
• T9030

1. 1

   Visually inspect the wiring harness and connector for the transmission oil temperature sensor for frayed wires, broken connections, or corrosion in the pins.

2. 2

   Perform a cold start sensor comparison: before starting a cold engine, check the display for engine coolant, hydraulic oil, and transmission oil temperatures. If the transmission temperature reads an extreme value while others are normal, it indicates a circuit fault.

3. 3

   Check the transmission fluid level to ensure it is correct.

4. 4

   Check for reference voltage: disconnect the sensor harness, turn ignition ON (engine off), and use a multimeter to verify approximately 5 volts at the connector. No voltage indicates a wiring issue; significantly higher voltage indicates a short to power.

5. 5

   Test the sensor's resistance: with the sensor disconnected, measure resistance across its pins. An infinite or 'OL' reading indicates an internal open circuit. You can also place the removed sensor in warm water to verify if the resistance changes with temperature.

1. 1

   Prepare machine for service

   Park the tractor on level ground, engage the parking brake, and allow the transmission to cool completely. Disconnect the battery before working on electrical components.

2. 2

   Locate the sensor

   Find the transmission oil temperature sensor screwed into the transmission housing. It is often near the valve body or transmission filter head. Remove any heat shields if necessary for access.

3. 3

   Drain transmission oil

   Depending on the sensor's location, partially or fully drain the transmission oil to prevent spillage when the sensor is removed.

4. 4

   Remove the old sensor

   Disconnect the electrical connector. Use an appropriate wrench to carefully unscrew and remove the faulty sensor from the transmission case.

5. 5

   Install the new sensor

   Clean the mounting threads on the transmission case. Apply thread sealant to the new sensor (unless pre-applied or using an O-ring). Hand-thread the sensor to avoid cross-threading, then tighten to the manufacturer's specified torque. Reconnect the electrical connector securely.

6. 6

   Refill oil and verify repair

   Refill the transmission fluid to the correct level if drained. Reconnect the battery, turn the ignition on, and clear the fault codes using the dashboard interface or a diagnostic tool. Start the tractor, check for leaks, and verify a plausible temperature reading on the dashboard.