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. Component operating range

  7. Inspection procedure

  8. Replace engine coolant temperature sensor

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
Case 1:
Engine Coolant Temperature (ECT) is between 35°C and 60°C (95°F and 140°F) when engine is started, and conditions (a) and (b) are met (2 trip detection logic):
(a) Vehicle driven at varying speeds (accelerated and decelerated)
(b) ECT remains within 3°C (5.4°F) of initial ECT
Case 2:
ECT is more than 60°C (140°F) when engine is started, and conditions (a) and (b) are met (6 trip detection logic):
(a) Vehicle driven at varying speeds (accelerated and decelerated)
(b) ECT measurements remain within 1°C (1.8°F) of initial ECT on 6 successive occasions
ECT sensor

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 is low, the resistance of the thermistor increases. When the temperature is 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:
  1. Upon starting the engine, the ECT is between 35°C and 60°C (95°F and 140°F). If after driving for 250 seconds, the ECT remains within 3°C (5.4°F) of the staring temperature, the DTC is set (2 trip detection logic).
  2. Upon starting the engine, the ECT is over 60°C (140°F). If after driving for 250 seconds, the ECT remains within 1°C (1.8°F) of the starting temperature, the DTC is set (6 trip detection logic).

MONITOR STRATEGY


Related DTCs
P0116: Engine coolant temperature sensor output stuck at low engine coolant temperature
P0116: Engine coolant temperature sensor output stuck at high engine coolant temperature
Required Sensors / Components (Main)
Engine Coolant Temperature (ECT) sensor
Required Sensors / Components (Related)
Crankshaft position sensor, intake air temperature sensor and mass air flow meter
Frequency of Operation
Continuous
Duration
250 seconds or more
MIL Operation
2 driving cycles:
ECT sensor stuck at low engine coolant temperature
6 driving cycles:
ECT sensor stuck at high engine coolant temperature
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


Engine Coolant Temperature Sensor Output Stuck at Low Engine Coolant Temperature:
The monitor will run whenever these DTCs are not present
P0100, P0101, P0102, P0103 (MAF Sensor)
Cumulative idle off period
250 seconds or more
Speed increase by 18.6 mph (30 km/h) or more
10 times or more
Engine coolant temperature at engine start
35° to 60°C (95° to 140°F)
Intake air temperature at engine start
-6.7°C (20°F) or more

Engine Coolant Temperature Sensor Output Stuck at High Engine Coolant Temperature:
The monitor will run whenever these DTCs are not present
P0100, P0101, P0102, P0103 (MAF Sensor)
Engine coolant temperature at engine start
60°C (140°F) or more
Intake air temperature at engine start
-6.7°C (20°F) or more
Stop and go*1
Once or more
Steady driving and stop*2
Once or more
*1: The vehicle is stopped for 20 seconds or more and accelerated to more than 43.5 mph (70 km/h) within 40 seconds.
*2: Following these steps: 1) the vehicle is driven at 40.4 mph (65 km/h) or more for 30 seconds or more and the vehicle speed reaches 43.5 mph (70 km/h); 2) the vehicle is decelerated from 40.4 mph (65 km/h) to 1.86 mph (3 km/h) or less within 35 seconds; and 3) the vehicle is stopped for 10 seconds.

TYPICAL MALFUNCTION THRESHOLDS


Engine Coolant Temperature Sensor Output Stuck at Low Engine Coolant Temperature:
ECT change
Less than 3°C (5.4°F)

Engine Coolant Temperature Sensor Output Stuck at High Engine Coolant Temperature:
ECT change
1°C (1.8°F) or less

COMPONENT OPERATING RANGE


Engine coolant temperature
Varies with actual engine coolant temperature

INSPECTION PROCEDURE

HINT:
  1. If any of DTCs P0115, P0117, P0118 or P0125 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 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.REPLACE ENGINE COOLANT TEMPERATURE SENSOR

  1. Replace the engine coolant temperature sensor.


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