P1725 (blink 37) 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 U340E system and turns on the Malfunction indicator lamp (Check Engine). First check: workshop check order (RM821E): INSPECT TRANSMISSION REVOLUTION SENSOR(NT) -> CHECK WIRE HARNESS AND CONNECTOR(NT+ − NT−).

Code

P1725 · blink 37

System

ECT U340E

Dashboard light

Malfunction indicator lamp (Check Engine)

Applies to

4-speed A/T U340E. PK: ZZE122R-GEPNKP 1.8 auto from 07.2005 (EPC fig 3501/3512 note (0507- )ATM..PKN); JDM NZE121 1NZ autos

Confidence

high (official Toyota RM821E)

Source

toyotamanuals.gitlab.io

Symptoms and when it is set

1. The Engine ECU detects conditions (a), (b), (c) and (d) conti- nuity 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(NT+ − NT−)

Related on this car

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

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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.