2007 TOYOTA SIENNA Service Repair Manual

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Page 441 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–135
ES
C
A
(a) Disconnect the M6 Mass Air Flow (MAF) meter
connector.
(b) Connect terminals THA and E2 of the MAF meter wire
harness side connector.

Page 442 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1362GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(a) Disconnect the M6 MAF meter connector.
(b) Disconnect the E9 ECM connector.
(c) Measure the resistance according to the value(s) in the
ta

Page 443 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–137
ES
(a) Disconnect the M6 MAF meter connector.
(b) Disconnect the E9 ECM connector.
(c) Measure the resistance according to the value(s) in the
ta

Page 444 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1382GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DESCRIPTION
The Intake Air Temperature (IAT) sensor, mounted on the Mass Air Flow (MAF) meter, monitors the IAT.
The IAT sensor has a built-in

Page 445 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–139
ES
TYPICAL ENABLING CONDITIONS
All:
After engine stop:
After cold engine start:
TYPICAL MALFUNCTION THRESHOLDS
After engine stop:
After cold engin

Page 446 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1402GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(e) Read the DTCs.
Result
HINT:
If any DTCs other than P0111 are output, troubleshoot
those DTCs first.
B
A
Display (DTC Output) Proceed to
P0

Page 447 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–141
ES
DESCRIPTION
A thermistor is built into the Engine Coolant Temperature (ECT) sensor, of which the resistance value
varies according to the ECT.

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–141
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 (176F) 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 selecting the following menu items 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 becomes low, the resistance in the thermistor increases. When the temperature
becomes 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:
If the sensor voltage output is -40
C (-40F) 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.
MONITOR STRATEGY
DTC P0115 Engine Coolant Temperature Circuit
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 1Open 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 4Short 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 2Open 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 Malfunctions
-40
C (-40F) Open circuit
140
C (284F) or higher Short circuit
Related DTCsP0115: Engine coolant temperature sensor open/short (Fluctuating)
P0117: Engine coolant temperature sensor short (Low electrical voltage)
P0118: Engine coolant temperature sensor open (High electrical voltage)

Page 448 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1422GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
P0115:
P0117:
P0118:
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
H

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