2007 TOYOTA SIENNA check engine

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 the TP sensor to monitor the throttle valve opening angle.
This sensor transmits two signals: VTA1 and VTA2. VTA1 is used to detect the throttle opening angle and
VTA2 is used to detect malfunctions in VTA1. The ECM performs several checks to confirm the proper
operation of the TP sensor and VTA1.
For each throttle opening angle, a specific voltage difference is expected between the outputs of VTA1
and VTA2. If the voltage output difference between the two signals deviates from the normal operating
range, the ECM interprets this as a malfunction of the TP sensor. The ECM illuminates the MIL and sets
the DTC.
If the malfunction is not repaired successfully, the DTC is set 2 seconds after the engine is next started.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
DTC P0121Throttle / Pedal Position Sensor / Switch "A"
Circuit Range / Performance Problem
DTC No. DTC Detection Condition Trouble Area
P0121Difference between VTA1 and VTA2 voltages less than
0.8 V, or more than 1.6 V for 2 seconds (1 trip detection
logic)TP sensor (built into throttle body)
Related DTCs P0121: TP sensor rationality
Required Sensors / Components (Main) TP sensor
Required Sensors / Components (Related) -
Frequency of Operation Continuous
Duration Within 2 seconds
MIL Operation Immediate
Sequence of Operation None
This monitor will not run whenever these DTCs are not
presentNone
Either of the following conditions is met: Condition 1 or 2
1. Ignition switch ON
2. Electric throttle motor power ON
TP sensor malfunction (P0120, P0122, P0123, P0220,
P0222, P0223, P2135)Not detected
Difference of TP sensor voltage between VTA1 and
VTA2 x 0.8Less than 0.8 V, or more than 1.6 V

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-safe mode. During fail-safe mode, the ECM cuts the current to
the throttle actuator off, and the throttle valve is returned to a 6.5
throttle angle by the return spring. The
ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition
timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue at a
minimal speed. If the accelerator pedal is depressed slowly, the vehicle can be driven slowly.
Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.
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) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(e) Read the DTC.
Result
HINT:
If any DTCs other than P0121 are output, troubleshoot
those DTCs first.
B
A
1CHECK ANY OTHER DTC OUTPUT (IN ADDITION TO DTC P0121)
Display (DTC output) Proceed to
P0121 A
P0121 and other DTCs B
GO TO DTC CHART
REPLACE THROTTLE BODY

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 Temperature (ECT) sensor may have an open or a short circuit. Troubleshoot those DTCs first.
• 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.
Result
HINT:
If any DTCs other than P0125 are output, troubleshoot
those DTCs first.
B
A
(a) Remove the thermostat (See page CO-16).
(b) Check the valve opening temperature of the thermostat
(See page CO-17).
Standard:
80 to 84
C (176 to 183F)
HINT:
In addition to the above check, confirm that the valve is
completely closed when the temperature is below the
standard.
(c) Reinstall the thermostat (See page CO-17).
NG
OK
1CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0125)
Display (DTC Output) Proceed to
P0125 A
P0125 and other DTCs B
GO TO DTC CHART (See page ES-56)
2INSPECT THERMOSTAT
REPLACE THERMOSTAT (See page CO-16)

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 modifications.
NG
OK
3CHECK COOLING SYSTEM
REPAIR OR REPLACE COOLING SYSTEM
REPLACE ENGINE COOLANT TEMPERATURE SENSOR (See page ES-516)

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) despite
sufficient engine warm-up time.
MONITOR DESCRIPTION
The ECM estimates the ECT based on the starting temperature, engine loads, and engine speeds. The
ECM then compares the estimated temperature with the actual ECT. When the estimated ECT reaches
75
C (167F), the ECM checks the actual ECT. If the actual ECT is less than 75C (167F), the ECM
interprets this as a malfunction in the thermostat or the engine cooling system and sets the DTC.
MONITOR STRATEGY
DTC P0128Coolant Thermostat (Coolant Temperature
Below Thermostat Regulating Temperature)
DTC No. DTC Detection Condition Trouble Area
P0128Conditions (a), (b) and (c) are met for 5 seconds (2 trip
detection logic):
(a) Cold start
(b) Engine warmed up
(c) ECT less than 75
C (167F)•Thermostat
• Cooling system
• ECT sensor
•ECM
Related DTCs P0128: Coolant Thermostat
Required Sensors / Components (Main) Thermostat
A082385E11

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)

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–167
ES
Result
HINT:
If any DTCs other than P0128 are output, troubleshoot
those DTCs first.
B
A
(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 modifications.
NG
OK
(a) Remove the thermostat (See page CO-16).
(b) Check the valve opening temperature of the thermostat
(See page CO-17).
Standard:
80 to 84
C (176 to 183F)
HINT:
In addition to the above check, confirm that the valve is
completely closed when the temperature is below the
standard.
(c) Reinstall the thermostat (See page CO-17).
NG
OK
Display (DTC Output) Proceed to
P0128 A
P0128 and other DTCs B
GO TO DTC CHART (See page ES-56)
2CHECK COOLING SYSTEM
REPAIR OR REPLACE COOLING SYSTEM
3INSPECT THERMOSTAT
REPLACE THERMOSTAT (See page CO-16)
REPLACE ECM (See page ES-498)

ES–1742GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
Heated Oxygen Sensor Output Voltage (High output voltage):
Heated Oxygen Sensor Impedance (Low):
Heated Oxygen Sensor Impedance (High):
Heated Oxygen Sensor Impedance (Extremely High):
COMPONENT OPERATING RANGE
MONITOR RESULT
Refer to CHECKING MONITOR STATUS (See page ES-19).
(b) Rear HO2 sensor voltage Less than 0.21 V
(c) OSC (Oxygen Storage Capacity of Catalyst) 2.0 g (0.0044 lb) or more
All of the following conditions (a), (b) and (c) are met. -
(a) Commanded air-fuel ratio 14.9 or more
(b) Rear HO2 sensor voltage More than 0.59 V
(c) OSC (Oxygen Storage Capacity of Catalyst) 2.0 g (0.0044 lb) or more
Duration that following condition is met 30 seconds or more
Rear heated oxygen sensor impedance Less than 5
Duration that following condition is met 90 seconds or more
Rear heated oxygen sensor impedance 15 k
or more
Duration that following condition is met 10 seconds or more
Rear heated oxygen sensor voltage 1.2 V or more
Duration that following condition is met 30 seconds or more
Heated oxygen sensor voltage Varies between 0.1 and 0.9 V