2007 TOYOTA SIENNA Service Repair Manual

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Page 465 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–159
ES
(a) Disconnect the T2 throttle body connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(

Page 466 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1602GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
HINT:
This DTC relates to the Throttle Position (TP) sensor.
DESCRIPTION
Refer to DTC P0120 (See page ES-145).
MONITOR DESCRIPTION
The ECM uses

Page 467 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–161
ES
FAIL-SAFE
When this DTC, as well as other DTCs relating to ETCS (Electronic Throttle Control System)
malfunctions, is set, the ECM enters fail

Page 468 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1622GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DESCRIPTION
Refer to DTC P0115 (See page ES-133).
MONITOR DESCRIPTION
The resistance of the ECT sensor varies in proportion to the actual ECT.

ES–1622GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DESCRIPTION
Refer to DTC P0115 (See page ES-133).
MONITOR DESCRIPTION
The resistance of the ECT sensor varies in proportion to the actual ECT. The ECM supplies a constant
voltage to the sensor and monitors the signal output voltage of the sensor. The signal voltage output
varies according to the changing resistance of the sensor. After the engine is started, the ECT is
monitored through this signal. If the ECT sensor indicates that the engine is not yet warm enough for
closed-loop fuel control, despite a specified period of time having elapsed since the engine was started,
the ECM interprets this as a malfunction in the sensor or cooling system and sets the DTC.
Example:
The ECT is 0
C (32F) at engine start. After 5 minutes running time, the ECT sensor still indicates that the
engine is not warm enough to begin closed-loop fuel (air-fuel ratio feedback) control. The ECM interprets
this as a malfunction in the sensor or cooling system and sets the DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
WIRING DIAGRAM
Refer to DTC P0115 (See page ES-134).
DTC P0125Insufficient Coolant Temperature for Closed
Loop Fuel Control
DTC No. DTC Detection Condition Trouble Area
P0125Engine coolant temperature (ECT) does not reach
closed-loop enabling temperature for 20 minutes (this
period varies with engine start ECT)• Cooling system
• Engine coolant temperature sensor
• Thermostat
Related DTCs P0125: Insufficient engine coolant temperature for closed-loop fuel control
Required Sensors / Components (Main) Thermostat, cooling system
Required Sensors / Components (Related) Engine coolant temperature sensor and mass air flow meter
Frequency of Operation Continuous
Duration78 seconds: Engine coolant temperature at engine start -8.34
C (17F) or more
131.3 seconds: Engine coolant temperature at engine start -19.45 to -8.34C (-3 to
17
F)
20 minutes: Engine coolant temperature at engine start less than -19.45
C (-3F)
MIL Operation 2 driving cycles
Sequence of Operation None
The monitor will run whenever these DTCs are not
presentP0100, P0101, P0102, P0103 (MAF) sensor, P0110, P0111, P0112, P0113 (IAT
sensor), P0115, P0116, P0117, P0118 (ECT sensor)
Fuel cut OFF
Engine Running
Time until actual engine coolant temperature reaches
closed-loop fuel control enabling temperature78 seconds or more: Engine coolant temperature at engine start -8.34
C (17F) or
more
131.3 seconds or more: Engine coolant temperature at engine start -19.45 to -8.34
C
(-3 to 17
F)
20 minutes or more: Engine coolant temperature at engine start less than -19.45C (-
3
F)

Page 469 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–163
ES
INSPECTION PROCEDURE
HINT:
• If any of DTCs P0115, P0116, P0117 or P0118 are set simultaneously with DTC P0125, the Engine
Coolant Temperatu

Page 470 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1642GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(a) Check for defects in the cooling system that might cause
the system to be too cold, such as abnormal radiator fan
operation or any modifi

Page 471 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–165
ES
HINT:
This DTC relates to the thermostat.
DESCRIPTION
This DTC is set when the Engine Coolant Temperature (ECT) does not reach 75C (167F) despi

Page 472 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1662GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the intelligent tester. The

ES–1662GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
INSPECTION PROCEDURE
HINT:
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.
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the tester on.
(d) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / CURRENT CODES.
(e) Read the DTCs.
Required Sensors / Components (Related)Engine Coolant Temperature (ECT) sensor, Intake Air Temperature (IAT) sensor,
Vehicle speed sensor
Frequency of Operation Once per driving cycle
Duration 900 seconds
MIL Operation 2 driving cycles
Sequence of Operation None
The monitor will run whenever these DTCs are not
presentP0010, P0020 (VVT VSV 1, 2), P0011, P0012 (VVT System 1-Advance, Retard),
P0021, P0022 (VVT System 2-Adavance, Retard), P0031, P0032, P0051, P0052 (A/
F Sensor Heater Sensor 1), P0100, P0101, P0102, P0103 (MAF Sensor), P0110,
P0112, P0113 (IAT Sensor), P0115, P0116, P0117, P0118 (ECT Sensor), P0125
(Insufficient ECT for Closed Loop), P0136, P0156 (O2 Sensor 2), P0171, P0172
(Fuel System), P0300, P0301, P0302, P0303, P0304, P0305, P0306 (Misfire),
P0335 (CKP Sensor), P0340 (CMP sensor), P0345 (VVT sensor), P0351, P0352,
P0353, P0354, P0355, P0356 (Ignitor), P0500 (VSS), P2196, P2198(A/F Sensor
(Rationality)), P2A00, P2A03 (A/F Sensor (Slow Response))
Battery voltage 11 V or more
Either of following conditions is met: Condition 1 or 2
1. All of following conditions are met: Conditions (a), (b) and (c)
(a) ECT at engine start - IAT at engine start -15 to 7
C (5 to 45F)
(b) ECT at engine start -10 to 56
C (14 to 133F)
(c) IAT at engine start -10 to 56
C (14 to 133F)
2. All of following conditions are met: Conditions (d), (e) and (f)
(d) ECT at engine start - IAT at engine start More than 7
C (45F)
(e) ECT at engine start 56
C (133F) or less
(f) IAT at engine start -10
C (14F) or more
Accumulated time that vehicle speed is 80 mph (128
km/h) or moreLess than 20 seconds
Duration that all of the following conditions 1 and 2 are
met5 seconds or more
1. Estimated ECT 75
C (167F) or more
2. ECT sensor output Less than 75
C (167F)
1CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0128)

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