2007 TOYOTA SIENNA Service Repair Manual

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Page 649 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–3562GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(a) Disconnect the A15 Accelerator Pedal Position (APP)
sensor connector.
(b) Disconnect the E4 ECM connector.
(c) Measure the resistance acco

Page 650 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–357
ES
(a) Disconnect the A15 APP sensor connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s)

Page 651 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–3582GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
B
ASYSTEM OK
REPLACE ECM (See page ES-498)

Page 652 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–359
ES
HINT:
This DTC relates to the Accelerator Pedal Position (APP) sensor.
DESCRIPTION
Refer to DTC P2120 (See page ES-343).
MONITOR DESCRIPTION
Th

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–359
ES
HINT:
This DTC relates to the Accelerator Pedal Position (APP) sensor.
DESCRIPTION
Refer to DTC P2120 (See page ES-343).
MONITOR DESCRIPTION
The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal
position sensor has 2 sensor elements and 2 signal outputs: VPA and VPA2. VPA is used to detect the
actual accelerator pedal angle (used for engine control) and VPA2 is used to detect malfunctions in VPA.
When the difference between the voltage outputs of VPA and VPA2 deviates from the standard, the ECM
determines that the accelerator pedal position sensor is malfunctioning. The ECM turns on the MIL and
the DTC is set.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
FAIL-SAFE
The accelerator pedal position sensor has 2 (main and sub) sensor circuits. If a malfunction occurs in
either of the sensor circuits, the ECM detects the abnormal signal voltage difference between the 2 sensor
circuits and switches to limp mode. In limp mode, the functioning circuit is used to calculate the
accelerator pedal opening angle to allow the vehicle to continue driving. If both circuits malfunction, the
ECM regards the opening angle of the accelerator pedal as being fully closed. In this case, the throttle
valve remains closed as if the engine is idling.
DTC P2121Throttle / Pedal Position Sensor / Switch "D"
Circuit Range / Performance
DTC No. DTC Detection Condition Trouble Area
P2121Difference between VPA and VPA2 is less than 0.4 V, or
more than 1.2 V for 0.5 seconds (1 trip detection logic)• Accelerator position (APP) sensor
•ECM
Related DTCs P2121: Accelerator pedal position (APP) sensor rationality
Required Sensors / Components (Main) APP sensor
Required Sensors / Components (Related) -
Frequency of Operation Continuous
Duration 0.5 seconds
MIL Operation Immediate
Sequence of Operation None
The monitor will run whenever these DTCs are not
presentNone
Either of the following conditions is met. Condition 1 or 2
1. Ignition switch ON
2. Electronic throttle actuator power ON
Difference between VPA1 voltage (learned value) and
VPA2 voltage (learned value)Less than 0.4 V, or more than 1.2 V

Page 653 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–3602GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
If a pass condition is detected and then the ignition switch is turned off, the fail-safe operation stops and
the system returns to a normal c

Page 654 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–361
ES
(a) Disconnect the A15 Accelerator Pedal Position (APP)
sensor connector.
(b) Disconnect the E4 ECM connector.
(c) Measure the resistance acco

Page 655 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–3622GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(f) Select the following menu items on the tester:
DIAGNOSIS / ENHANCED OBD II / DTC INFO /
CURRENT CODES.
(g) Read the DTCs.
Result
B
A
Disp

Page 656 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–363
ES
HINT:
• Although the DTC titles say oxygen sensor, these DTCs relate to the Air-Fuel Ratio (A/F) sensor.
• Sensor 1 refers to the sensor mo

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–363
ES
HINT:
• Although the DTC titles say oxygen sensor, these DTCs relate to the Air-Fuel Ratio (A/F) sensor.
• Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and
located near the engine assembly.
DESCRIPTION
The A/F sensor generates a voltage* that corresponds to the actual air-fuel ratio. This sensor voltage is
used to provide the ECM with feedback so that it can control the air-fuel ratio. The ECM determines the
deviation from the stoichiometric air-fuel ratio level, and regulates the fuel injection time. If the A/F sensor
malfunctions, the ECM is unable to control the air-fuel ratio accurately.
The A/F sensor is the planar type and is integrated with the heater, which heats the solid electrolyte
(zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust
gas temperature is low), a current flows into the heater to heat the sensor, in order to facilitate accurate
oxygen concentration detection. In addition, the sensor and heater portions are narrower than the
conventional type. The heat generated by the heater is conducted to the solid electrolyte through the
alumina, therefore the sensor activation is accelerated.
A three-way catalytic converter (TWC) is used in order to convert the carbon monoxide (CO), hydro
carbon (HC), and nitrogen oxides (HOx) into less harmful substances. To allow the TWC to function
effectively, it is necessary to keep the air-fuel ratio of the engine near the stoichiometric air-fuel ratio.
*: Value changes inside the ECM. Since the A/F sensor is the current output element, a current is
converted to a voltage inside the ECM. Any measurements taken at the A/F sensor or ECM connectors
will show a constant voltage.
DTC P2195Oxyg en ( A/ F) S en so r S ig n al Stu ck Lea n (Ban k 1
Sensor 1)
DTC P2196Oxygen (A/F) Sensor Signal Stuck Rich (Bank 1
Sensor 1)
DTC P2197Oxyg en ( A/ F) S en so r S ig n al Stu ck Lea n (Ban k 2
Sensor 1)
DTC P2198Oxygen (A/F) Sensor Signal Stuck Rich (Bank 2
Sensor 1)
G038016E06

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