Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

1Gr-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Monitor description

  3. Monitor strategy

  4. Typical enabling conditions

  5. Typical malfunction thresholds

  6. Wiring diagram

  7. Inspection procedure

  8. Check any other dtcs output (in addition to dtc p0125)

  9. Inspect thermostat

  10. Check cooling system

DTC P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control


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DESCRIPTION

Refer to DTC P0115 (Click here).

DTC No.
DTC Detection Conditions
Trouble Areas
P0125
  1. Case 1:
    Engine Coolant Temperature (ECT) less than -19.45°C (-3°F) at engine start and following conditions met (2 trip detection logic):
    (a) 20 minutes elapsed since engine start
    (b) ECT sensor value remains below closed-loop fuel control enabling temperature
  2. Case 2:
    ECT between -19.45°C and -8.34°C (-3°F and 17°F) at engine start and following conditions met (2 trip detection logic):
    (a) 105 seconds elapsed since engine start
    (b) ECT sensor value remains below closed-loop fuel control enabling temperature
  3. Case 3:
    ECT above -8.34°C (17°F) at engine start and following conditions met (2 trip detection logic):
    (a) 61 seconds elapsed since engine start
    (b) ECT sensor value remains below closed-loop fuel control enabling temperature
  1. Cooling system
  2. ECT sensor
  3. Thermostat (water inlet)

MONITOR DESCRIPTION

The resistance of the ECT sensor varies in proportion to the actual ECT. The ECM supplies a constant voltage to the sensor and monitors the signal output voltage of the sensor. The signal voltage output varies according to the changing resistance of the sensor. After the engine is started, the ECT is monitored through this signal. If the ECT sensor indicates that the engine is not yet warm enough for closed-loop fuel control, despite a specified period of time having elapsed since the engine was started, the ECM interprets this as a malfunction in the sensor or cooling system and sets the DTC.
Example:
  1. The ECT is 0°C (32°F) at engine start. After 5 minutes running time, the ECT sensor still indicates that the engine is not warm enough to begin closed-loop fuel (air-fuel ratio feedback) control. The ECM interprets this as a malfunction in the sensor or cooling system and sets the DTC.

MONITOR STRATEGY


Related DTCs
P0125: Insufficient engine coolant temperature for closed-loop fuel control
Required Sensors / Components (Main)
Thermostat, Cooling system, ECT sensor
Required Sensors / Components (Related)
Engine coolant temperature sensor and mass air flow meter
Frequency of Operation
MAF meter
Duration
61 seconds: Engine coolant temperature at engine start -8.34°C (17°F) or more
105 seconds: Engine coolant temperature at engine start -19.45 to -8.34°C (-3 to 17°F)
20 minutes: Engine coolant temperature at engine start less than -19.45°C (-3°F)
MIL Operation
2 driving cycles
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


The monitor will run whenever these DTCs are not present
P0100, P0101, P0102, P0103 (MAF meter), P0110, P0112, P0113 (IAT sensor), P0115, P0116, P0117, P0118 (ECT sensor)
Fuel cut
OFF
Engine
Running

TYPICAL MALFUNCTION THRESHOLDS


Time until "engine coolant temperature" detection temperature reaches feedback start temperature
-
When the temperature at the time of engine starting is -8.34°C (17°F) or more
Engine coolant temperature is less than "closed-loop enable temperature" when 61 seconds or more after engine start
When the temperature at the time of engine starting is -19.45 to -8.34°C (-3 to 17°F)
Engine coolant temperature is less than "closed-loop enable temperature" when 105 seconds or more after engine start
When the temperature at the time of engine starting is -19.45°C (-3°F) or less
Engine coolant temperature is less than "closed-loop enable temperature" when 20 minutes. or more after engine start

WIRING DIAGRAM

Refer to DTC P0115 (Click here).

INSPECTION PROCEDURE

HINT:
  1. If any of DTCs P0115, P0116, P0117 or P0118 are set simultaneously with DTC P0125, the Engine Coolant Temperature (ECT) sensor may have an open or a short circuit. Troubleshoot those DTCs first.
  2. Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0125)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on.

  1. Turn the tester on.

  1. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

  1. Read DTCs.

    Result:

    Display (DTC Output)
    		Proceed to
    P0125
    		A
    P0125 and other DTCs
    		B
    HINT:
    If any DTCs other than P0125 are output, troubleshoot those DTCs first.


Bnext
GO TO DTC CHART
A
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2.INSPECT THERMOSTAT

  1. Remove the thermostat (Click here).

  1. Check the valve opening temperature of the thermostat (Click here).

    Standard:
    80° to 84°C (176° to 183°F)
    HINT:
    In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.

  1. Reinstall the thermostat (Click here).



NGnext
REPLACE THERMOSTAT
OK
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3.CHECK COOLING SYSTEM

  1. Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any modifications.



NGnext
REPAIR OR REPLACE COOLING SYSTEM
OK
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REPLACE ENGINE COOLANT TEMPERATURE SENSOR