Brand:

Toyota

Model Name:

Yaris NCP90 91 92 93

Manual:

Repair Manual

Section:

1Nz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Inspection procedure

  3. Check any other dtcs output (in addition to dtc p0116)

  4. Inspect thermostat

DTC P0116 Engine Coolant Temperature Circuit Range / Performance Problem


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DESCRIPTION

Refer to DTC P0115 (Click here).

DTC No.
DTC Detection Conditions
Trouble Areas
P0116
Engine Coolant Temperature (ECT) between -40°C and 60°C (-40°F and 140°F) when engine started, and conditions (a) and (b) met (2 trip detection logic):
  1. (a) Vehicle driven at varying speeds (accelerated and decelerated)
  2. (b) ECT remains within 3°C (5.4°F) of initial ECT
  1. Thermostat
  2. ECT sensor

INSPECTION PROCEDURE

HINT:
  1. If any of DTCs P0115, P0117 or P0118 are set simultaneously with DTC P0116, the ECT sensor may have an open or a short circuit. Troubleshoot those DTCs first.
  2. Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116)

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Read DTCs.

Result:
Display (DTC Output)
Proceed To
P0116
A
P0116 and other DTCs
B
HINT:
If any DTCs other than P0116 are output, troubleshoot those DTCs first.


Bnext
GO TO DTC CHART (Click here)
A
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2.INSPECT THERMOSTAT

  1. Remove the thermostat (Click here).

  1. Check the valve opening temperature of the thermostat.

    Standard:
    80°C to 84°C (176°F 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 (Click here)
OK
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REPLACE ENGINE COOLANT TEMPERATURE SENSOR