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Toyota Sienna Service Manual: Engine Coolant Temperature Circuit Range / Performance Problem

Toyota Sienna Service Manual / 2GR-FE Engine control system / SFI system / Diagnostic trouble code chart / Engine Coolant Temperature Circuit Range / Performance Problem

DTC P0116 Engine Coolant Temperature Circuit Range / Performance Problem

DESCRIPTION

Refer to DTC P0115

DTC No.

DTC Detection Condition

Trouble Area

P0116

ECTs as listed below are nearly same (2 trip detection logic):
  •  ECT when engine is started at lower than 60C (140F) of ECT
  •  ECT when engine is warmed up
  • Thermostat
  •  ECT sensor
ECTs as listed below are nearly same when engine is started at higher than 60C (140F) of ECT (2 trip detection logic)
  •  ECT when engine is stopped after driving
  •  ECT when engine is started at lower than 60C (140F) of ECT
When either of following conditions is met (2 trip detection logic):
  •  When cold engine started and engine warmed up, Engine Coolant Temperature (ECT) sensor value does not change
  •  After engine is warmed up, ECT sensor value does not change when engine stopped and then next cold engine start is performed

MONITOR DESCRIPTION

The ECT sensor is used to monitor the ECT. The ECT sensor has a built-in thermistor with a resistance that varies according to the temperature of the engine coolant. When the ECT becomes low, the resistance of the thermistor increases. When the temperature becomes high, the resistance drops. These variations in the resistance are reflected in the voltage output from the ECT sensor.

The ECM monitors the sensor voltage and uses this value to calculate the ECT. If the sensor voltage output deviates from the normal operating range, the ECM interprets this deviation as a malfunction in the ECT sensor and sets the DTC.

Examples:

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

All:

TYPICAL ENABLING CONDITIONS

ECT sensor cold start monitor:

TYPICAL ENABLING CONDITIONS

ECT sensor soak monitor:

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

ECT sensor cold start monitor:

TYPICAL MALFUNCTION THRESHOLDS

ECT sensor soak monitor:

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

TYPICAL MALFUNCTION THRESHOLDS

INSPECTION PROCEDURE

HINT:

1 CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0166)

  1. Connect the intelligent tester to the DLC3.
  2.  Turn the ignition switch to the ON position.
  3.  Turn the tester on.
  4.  Enter the following menus: DIAGNOSIS / ENHANCED II / DTC INFO / CURRENT CODES.
  5.  Read the DTC.

Result

Result

2 INSPECT THERMOSTAT

  1. Remove the thermostat.
  2. Check the valve opening temperature of the thermostat.

Standard: 80 to 84C (176 to 183F)

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

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

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Problem symptoms table
HINT:  Use the table below to help determine the cause of the problem symptoms. The potential causes of the symptoms are listed in order of probability in the ''Suspected Area'' column of the table. Check each symptom by checking the suspected areas in the order they are listed. Rep ...

Installation
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