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. Wiring diagram

  8. Inspection procedure

  9. Read value of intelligent tester (engine coolant temperature)

  10. Read value of intelligent tester (check for open in wire harness)

  11. Read value of intelligent tester (check for open in ecm)

  12. Read value of intelligent tester (check for short in wire harness)

  13. Read value of intelligent tester (check for short in ecm)

DTC P0115 Engine Coolant Temperature Circuit

DTC P0117 Engine Coolant Temperature Circuit Low Input

DTC P0118 Engine Coolant Temperature Circuit High Input


​

DESCRIPTION

A thermistor is built into the Engine Coolant Temperature (ECT) sensor, of which the resistance value varies according to the ECT.
The structure of the sensor and its connection to the ECM are the same as those of the Intake Air Temperature (IAT) sensor.
HINT:
When any of DTCs P0115, P0117 and P0118 are set, the ECM enters fail-safe mode. During fail-safe mode, the ECT is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

DTC No.
Proceed to
DTC Detection Conditions
Trouble Areas
P0115
Step 1
Open or short in Engine Coolant Temperature (ECT) sensor circuit for 0.5 seconds (1 trip detection logic)
  1. Open or short in ECT sensor circuit
  2. ECT sensor
  3. ECM
P0117
Step 4
Short in Engine Coolant Temperature (ECT) sensor circuit for 0.5 seconds (1 trip detection logic)
  1. Short in ECT sensor circuit
  2. ECT sensor
  3. ECM
P0118
Step 2
Open in Engine Coolant Temperature (ECT) sensor circuit for 0.5 seconds (1 trip detection logic)
  1. Open in ECT sensor circuit
  2. ECT sensor
  3. ECM
HINT:
When any of these DTCs are set, check the ECT by selecting the following menu items on the intelligent tester: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.

Temperature Displayed
Malfunctions
-40°C (-40°F)
Open circuit
140°C (284°F) or higher
Short circuit

MONITOR DESCRIPTION

The Engine Coolant Temperature (ECT) sensor is used to monitor the ECT. The ECT sensor has a thermistor with a resistance that varies according to the temperature of the engine coolant. When the coolant temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops.
These variations in resistance are reflected in the voltage output from the sensor. The ECM monitors the sensor voltage and uses this value to calculate the ECT. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault in the ECT sensor and sets a DTC.
Example:
  1. If the sensor voltage output is -40°C (-40°F) for 0.5 seconds or more, the ECM determines that there is an open in the ECT sensor circuit, and sets DTC P0118. Conversely, if the voltage output is more than 140°C (284°F) for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and sets DTC P0117.
  2. If the malfunction is not repaired successfully, a DTC is set 0.5 seconds after the engine is next started.

MONITOR STRATEGY


Related DTCs
P0115: ECT sensor range check (Fluttering)
P0117: ECT sensor range check (Low voltage)
P0118: ECT sensor range check (High voltage)
Required Sensors / Components (Main)
Engine coolant temperature sensor
Required Sensors / Components (Related)
-
Frequency of Operation
Continuous
Duration
0.5 seconds
MIL Operation
Immediate
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


The monitor will run whenever these DTCs are not present
None

TYPICAL MALFUNCTION THRESHOLDS


P0115:
Engine coolant temperature sensor voltage
Less than 0.14 V or more than 4.91 V [More than 140°C (284°F), or less than -40°C (-40°F)]

P0117:
Engine coolant temperature sensor voltage
Less than 0.14 V [More than 140°C (284°F)]

P0118:
Engine coolant temperature sensor voltage
More than 4.91 V [Less than -40°C (-40°F)]

COMPONENT OPERATING RANGE


Engine coolant temperature sensor voltage
0.14 V to 4.91 V [-40 to 140°C (-40 to 284°F)]

WIRING DIAGRAM


If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit. 4Runner


INSPECTION PROCEDURE

HINT:
  1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
  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.READ VALUE OF INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)

  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 / DATA LIST / PRIMARY / COOLANT TEMP.

  1. Read the value displayed on the tester.

    Standard:
    Between 80°C and 97°C (176°F and 207°F) with warm engine.

    Result:

    Temperature Displayed
    		Proceed to
    -40°C (-40°F)
    		A
    140°C (284°F) or higher
    		B
    Between 80°C and 97°C (176°F and 207°F)
    		C
    HINT:
    1. If there is an open circuit, the intelligent tester indicates -40°C (-40°F).
    2. If there is a short circuit, the intelligent tester indicates 140°C (284°F) or higher.


Bnext
Go to step 4

Cnext
CHECK FOR INTERMITTENT PROBLEMS
A
next down

2.READ VALUE OF INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)
  1. Disconnect the E2 Engine Coolant Temperature (ECT) sensor connector. 4Runner

  2. Disconnect the E2 Engine Coolant Temperature (ECT) sensor connector.

  1. Connect terminals 1 and 2 of the ECT sensor connector on the wire harness side.

  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 / DATA LIST / PRIMARY / COOLANT TEMP.

  1. Read the value displayed on the tester.

    Standard:
    140°C (284°F) or higher

  1. Reconnect the ECT sensor connector.



OKnext
CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR
NG
next down

3.READ VALUE OF INTELLIGENT TESTER (CHECK FOR OPEN IN ECM)
  1. Disconnect the E4 ECT sensor connector. 4Runner

  2. Disconnect the E4 ECT sensor connector.

  1. Connect terminals THW and E2 of the E4 ECM connector.

    HINT:
    Before checking, do visual and contact pressure checks on the ECM connector.

  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 / DATA LIST / PRIMARY / COOLANT TEMP.

  1. Read the value displayed on the tester.

    Standard:
    140°C (284°F) or higher

  1. Reconnect the ECT sensor connector.



OKnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
NG
next down
CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM

4.READ VALUE OF INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)
  1. Disconnect the E2 ECT sensor connector. 4Runner

  2. Disconnect the E2 ECT sensor connector.

  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 / DATA LIST / PRIMARY / COOLANT TEMP.

  1. Read the value displayed on the tester.

    Standard:
    -40°C (-40°F)

  1. Reconnect the ECT sensor connector.



OKnext
REPLACE ENGINE COOLANT TEMPERATURE SENSOR
NG
next down

5.READ VALUE OF INTELLIGENT TESTER (CHECK FOR SHORT IN ECM)
  1. Disconnect the E4 ECM connector. 4Runner

  2. Disconnect the E4 ECM connector.

  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 / DATA LIST / PRIMARY / COOLANT TEMP.

  1. Read the value displayed on the tester.

    Standard:
    -40°C (-40°F)

  1. Reconnect the ECM connector.



OKnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
NG
next down
REPLACE ECM