2GR-FE ENGINE CONTROL SYSTEM
– SFI SYSTEM
ES–153
ES
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.
HINT:
When any of these DTCs are set, check the ECT by entering the following menus on the intelligent tester:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.
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 drops, the resistance in the thermistor increases. When the temperature rises, the
resistance drops. These variations in resistance are reflected in the output voltage 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:
If the sensor output voltage 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.
If the malfunction is not repaired successfully, a DTC is set 0.5 seconds after the engine is next
started.
DTC
P0115
Engine Coolant Temperature Circuit Malfunc-
tion
DTC
P0117
Engine Coolant Temperature Circuit Low Input
DTC
P0118
Engine Coolant Temperature Circuit High Input
DTC No.
Proceed to
DTC Detection Condition
Trouble Area
P0115
Step 1
Open or short in Engine Coolant Temperature
(ECT) sensor circuit for 0.5 seconds (1 trip
detection logic)
•
Open or short in ECT sensor circuit
•
ECT sensor
•
ECM
P0117
Step 4
Short in Engine Coolant Temperature (ECT)
sensor circuit for 0.5 seconds (1 trip detection
logic)
•
Short in ECT sensor circuit
•
ECT sensor
•
ECM
P0118
Step 2
Open in Engine Coolant Temperature (ECT)
sensor circuit for 0.5 seconds (1 trip detection
logic)
•
Open in ECT sensor circuit
•
ECT sensor
•
ECM
Temperature Displayed
Malfunction
-40
°
C (-40
°
F)
Open circuit
140
°
C (284
°
F) or higher
Short circuit
Содержание 2GR-FE
Страница 176: ...ES 20 2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES NEXT 20 CONDUCT CONFIRMATION TEST END ...
Страница 247: ...2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES 91 ES OK REPLACE ECM See page ES 518 ...
Страница 412: ...ES 256 2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES A END ...
Страница 447: ...2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES 291 ES OK REPLACE ECM See page ES 518 ...
Страница 556: ...ES 400 2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES A REPLACE TCM ...
Страница 630: ...ES 474 2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES OK REPLACE ECM See page ES 518 ...
Страница 651: ...2GR FE ENGINE CONTROL SYSTEM CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY ES 487 ES 22 INSTALL ENGINE UNDER COVER LH ...
Страница 658: ...2GR FE ENGINE CONTROL SYSTEM VVT SENSOR ES 493 ES 22 INSTALL ENGINE UNDER COVER LH ...
Страница 719: ...FU 6 2GR FE FUEL FUEL SYSTEM FU PARTS LOCATION ENGINE ROOM RELAY BLOCK ECM FUEL INJECTOR FUEL PUMP A136014E01 ...
Страница 897: ...2GR FE STARTING SMART KEY SYSTEM ST 35 ST OK REPLACE MAIN BODY ECU ...
Страница 923: ...2GR FE STARTING SMART KEY SYSTEM ST 61 ST OK REPLACE MAIN BODY ECU ...
Страница 935: ...2GR FE STARTING SMART KEY SYSTEM ST 73 ST OK REPLACE MAIN BODY ECU ...
Страница 940: ...ST 78 2GR FE STARTING SMART KEY SYSTEM ST OK REPLACE MAIN BODY ECU ...
Страница 958: ...ST 96 2GR FE STARTING SMART KEY SYSTEM ST OK END MAIN BODY ECU DEFECTIVE ...