P1725 (blink 37, U441E) on Toyota Corolla E120: NC REVOLUTION SENSOR MALFUNCTION (INPUT TURBINE SPEED SENSOR)

Short answer: P1725 means “NC REVOLUTION SENSOR MALFUNCTION (INPUT TURBINE SPEED SENSOR)”. The car’s computer has found a fault in the ECT U441E system. First check: workshop check order (RM821E): INSPECT TRANSMISSION REVOLUTION SENSOR(NT) -> CHECK WIRE HARNESS AND CONNECTOR(Input Turbine Speed Sensor(NT) −.

Code

P1725 · blink 37

System

ECT U441E

Dashboard light

CHECK ENGINE (MIL) does NOT light (DTC stored in memory only)

Applies to

4-speed A/T U441E. Not a PK fitment (the PK EPC lists only A246E and U340E). Other-market fitment unverified.

Confidence

high (official Toyota RM821E)

Source

toyotamanuals.gitlab.io

Symptoms and when it is set

1. The Engine and ECT ECU detects conditions (a), (b), (c) and (d) continuity for 5 secs or more. (1−trip detection logic) (a) Vehicle speed : 50 km/h (20 mph) or more (b) 2nd, 3rd or O/D gear (c) Solenoid valves and neutral start switch are normal (d) NT < 300 rpm

Likely causes

1. Wire harness; Input turbine (NT) speed sensor; Engine ECU

What to check, in order

1. Workshop check order (RM821E): INSPECT TRANSMISSION REVOLUTION SENSOR(NT) -> CHECK WIRE HARNESS AND CONNECTOR(Input Turbine Speed Sensor(NT) −

Related on this car

• All fault codes for this car
• Warning lights
• Where the parts are (parts map)
• Common problems

← P0773/64 P1760/77 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.