2007 TOYOTA SIENNA Service Repair Manual

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Page 449 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–143
ES
• Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition
information as freeze frame data the mo

Page 450 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1442GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(a) Disconnect the E12 Engine Coolant Temperature (ECT)
sensor connector.
(b) Connect terminals 1 and 2 of the ECT sensor connector
on the wi

Page 451 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–145
ES
NG
(a) Disconnect the E12 ECT sensor connector.
(b) Connect the intelligent tester to the DLC3.
(c) Turn the ignition switch to the ON position

Page 452 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1462GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
NG
REPLACE ECM (See page ES-498)

Page 453 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–147
ES
DESCRIPTION
Refer to DTC P0115 (See page ES-133).
MONITOR DESCRIPTION
The ECT sensor is used to monitor the ECT. The ECT sensor has a built-in

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–147
ES
DESCRIPTION
Refer to DTC P0115 (See page ES-133).
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:
• Upon starting the engine, the ECT is between 35
C and 60C (95F and 140F). If the ECT remains
within 3
C (5.4F) of the stating temperature after driving for 250 seconds, the DTC is set (2 trip
detection logic).
• Upon starting the engine, the ECT is over 60
C (140F). If the ECT remains within 1C (1.8F) of the
starting temperature after driving for 250 seconds, the DTC is set (6 trip detection logic).
MONITOR STRATEGY
DTC P0116Engine Coolant Temperature Circuit Range /
Performance Problem
DTC No. DTC Detection Condition Trouble Area
P0116ECTs as listed below are nearly same (2 trip detection
logic):
– ECT when engine is started at lower than 60
C
(140
F) 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 60
C (140F) of ECT (2 trip
detection logic)
– ECT when engine is stopped after driving
– ECT when engine is started at lower than 60
C
(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
Related DTCsP0116: 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 5 hours
MIL Operation 2 driving cycles
Sequence of Operation None

Page 454 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1482GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
TYPICAL ENABLING CONDITIONS
All:
ECT sensor cold start monitor:
ECT sensor soak monitor:
TYPICAL MALFUNCTION THRESHOLDS
ECT sensor cold start m

Page 455 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–149
ES
Result
B
A
(a) Remove the thermostat (See page CO-16).
(b) Check the valve opening temperature of the thermostat.
Standard:
80 to 84
C (176 to

Page 456 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1502GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DESCRIPTION
The ECM calculates the difference between the readings of the coolant temperature sensor and intake air
temperature sensor. If the

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