2007 TOYOTA SIENNA Service Repair Manual

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Page 489 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–183
ES
(b) Read DTCs.
Result
B
A
(a) Connect the intelligent tester to the DLC3.
(b) Start the engine and turn the tester on.
(c) Warm up the engine.

Page 490 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1842GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
Result
B
C
A
OK:
No gas leakage.
NG
OK
A087979E15
Result Proceed to
OK A
NG (for 2WD model) B
NG (for 4WD model) C
REPLACE AIR FUEL RATIO SENSO

Page 491 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–185
ES
(a) Disconnect the H14 heated oxygen sensor connector
(Bank 1 Sensor 2) or H9 heated oxygen sensor
connector (Bank 2 Sensor 2).
(b) Measure t

Page 492 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1862GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(a) Disconnect the H14 or H9 HO2 sensor connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the va

Page 493 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–187
ES
Result
B
C
A
A103832E63
Result Proceed to
OK A
NG (for 2WD model) B
NG (for 4WD model) C
REPLACE HEATED OXYGEN SENSOR (See
page EC-32)
REPLACE

Page 494 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1882GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DESCRIPTION
The fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim
consists of both the s

ES–1882GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DESCRIPTION
The fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim
consists of both the short-term and long-term fuel trims.
The short-term fuel trim is fuel compensation that is used to constantly maintain the air-fuel ratio at
stoichiometric levels. The signal from the Air-Fuel Ratio (A/F) sensor indicates whether the air-fuel ratio is
rich or lean compared to the stoichiometric ratio. This triggers a reduction in the fuel injection volume if the
air-fuel ratio is rich and an increase in the fuel injection volume if it is lean.
Factors such as individual engine differences, wear over time and changes in operating environment
cause short-term fuel trim to vary from the central value. The long-term fuel trim, which controls overall
fuel compensation, compensates for long-term deviations in the fuel trim from the central value caused by
the short-term fuel trim compensation.
If both the short-term and long-term fuel trims are lean or rich beyond predetermined values, it is
interpreted as a malfunction, and the ECM illuminates the MIL and sets a DTC.
HINT:
• When DTC P0171 or P0174 is set, the actual air-fuel ratio is on the lean side. When DTC P0172 or
P0175 is set, the actual air-fuel ratio is on the rich side.
• If the vehicle runs out of fuel, the air-fuel ratio is lean and DTC P0171 or P0174 may be set. The MIL is
then illuminated.
DTC P0171 System Too Lean (Bank 1)
DTC P0172 System Too Rich (Bank 1)
DTC P0174 System Too Lean (Bank 2)
DTC P0175 System Too Rich (Bank 2)
DTC No. DTC Detection Condition Trouble Area
P0171
P0174With warm engine and stable air-fuel ratio feedback,
fuel trim considerably in error to lean side (2 trip
detection logic)• Intake system
• Injector blockage
• Mass Air Flow (MAF) meter
• Engine Coolant Temperature (ECT) sensor
• Fuel pressure
• Gas leakage from exhaust system
• Open or short in A/F sensor (bank 1, 2 sensor 1)
circuit
• A/F sensor (bank 1, 2 sensor 1)
• A/F sensor heater (bank 1, 2 sensor 1)
• A/F sensor heater relay
• A/F sensor heater and A/F sensor heater relay
circuits
• PCV valve and hose
• PCV hose connections
•ECM
P0172
P0175With warm engine and stable air-fuel ratio feedback,
fuel trim considerably in error to rich side (2 trip
detection logic)• Injector leakage or blockage
• MAF meter
• ECT sensor
• Ignition system
• Fuel pressure
• Gas leakage from exhaust system
• Open or short in A/F sensor (bank 1, 2 sensor 1)
circuit
• A/F sensor (bank 1, 2 sensor 1)
• A/F sensor heater (bank 1, 2 sensor 1)
• A/F sensor heater relay
• A/F sensor heater and A/F sensor heater relay
circuits
•ECM

Page 495 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–189
ES
• When the total of the short-term and long-term fuel trim values is within the malfunction threshold (and
the engine coolant temperature is

Page 496 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–1902GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
TYPICAL ENABLING CONDITIONS
Fuel-trim:
TYPICAL MALFUNCTION THRESHOLDS
Fuel trim:
WIRING DIAGRAM
Refer to DTC P2195 (See page ES-359).
INSPECTIO

ES–1902GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
TYPICAL ENABLING CONDITIONS
Fuel-trim:
TYPICAL MALFUNCTION THRESHOLDS
Fuel trim:
WIRING DIAGRAM
Refer to DTC P2195 (See page ES-359).
INSPECTION PROCEDURE
HINT:
For use of the intelligent tester only:
Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE
TEST. The A/F CONTROL function can help to determine whether the Air-Fuel Ratio (A/F) sensor, Heated
Oxygen (HO2) sensor and other potential trouble areas are malfunctioning.
The following instructions describe how to conduct the A/F CONTROL operation using the intelligent
tester.
1. Connect the intelligent tester to the DLC3.
2. Start the engine and turn the tester on.
3. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
4. Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F
CONTROL.
5. Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT
button to change the fuel injection volume).
6. Monitor the voltage outputs of the A/F and HO2 sensors (AFS B1S1 and O2S B1S2 or AFS B2S1 and
O2S B2S2) displayed on the tester.
HINT:
• The A/F CONTROL operation lowers the fuel injection volume by 12.5% or increases the injection
volume by 25%.
• Each sensor reacts in accordance with increases and decreases in the fuel injection volume.
Standard voltage
The monitor will run whenever these DTCs are not
presentP0010, P0020 (VVT VSV1, 2), P0011, P0012 (VVT System-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), P0115,
P0116, P0117, P0118 (ECT Sensor), P0120, P0121, P0122, P0123, P0220, P0222,
P0223, P2135 (TP Sensor), P0125 (Insufficient ECT for Closed Loop), P0335 (CKP
Sensor), P0340 (CMP Sensor), P0351, P0352, P0353, P0354, P0356 (Ignitor),
P0500 (VSS)
Fuel system status Closed-loop
Battery voltage 11 V or more
Either of the following conditions is met Condition 1 or 2
1. Engine RPM Less than 1100 rpm
2. Intake air amount per revolution 0.22 g/rev or more
Catalyst monitor Not executed
EVAP purge-cut Executing
Either of the following conditions is met Condition 1 or 2
1. Average between short-term fuel trim and long-term
fuel trim35% or more at 80
C (176F) of ECT
2. Average between short-term fuel trim and long-term
fuel trim-35% or less at 80
C (176F) of ECT
Tester Display (Sensor) Injection Volumes Status Voltages
AFS B1S1 or AFS B2S1 (A/F) +25% Rich Less than 3.0

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