Engine-Codes
 
OBDII Code List
 
P0125 2000 TOYOTA ECHO

P0125 2000 TOYOTA ECHO - Insufficient Coolant Temperature for Closed Loop Fuel Control

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?

Possible causes

  • Low engine coolant level
  • Fuel system
  • Leaking or stuck open thermostat
  • Faulty Engine Coolant Temperature (ECT) sensor
  • Engine Coolant Temperature (ECT) sensor harness is open or shorted
  • Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
  • ECM
  • PCV piping

When is the code detected?

The Engine Control Module (ECM) monitors the ECT signal voltage after engine start-up. If, after sufficient time has passed, the sensor still reports that the engine is not warm enough for closed-loop fuel control, the ECM interprets this as a fault in the sensor or cooling system and sets a Detected Trouble Code (DTC).
Example:
The ECT is 0C (32F) at engine start. After 5 minutes running time, the ECT sensor still indicates that the engine is not warm enough to begin active feedback control of the air-fuel ratio. The ECM interprets this as a fault in the sensor or cooling system and sets a DTC.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0125 2000 Toyota Echo Description

The Engine Coolant Temperature (ECT) sensor is used to monitor the temperature of the engine coolant. The resistance of the sensor varies with the actual coolant temperature. The Engine Control Module (ECM) applies a voltage to the sensor and the varying resistance of the sensor causes the signal voltage to vary.
OBDII Code P0125 2000 Toyota Echo - Insufficient Coolant Temperature for Closed Loop Fuel Control - Engine-Codes.com

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