2007 TOYOTA SIENNA Service Repair Manual

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Page 673 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–3802GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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

Page 674 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–381
ESHINT:
• DTC P2238, P2239, P2252 and P2253 indicate malfunctions related to the bank 1 A/F sensor circuit.
• DTC P2241, P2242, P2255 and P225

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–381
ESHINT:
• DTC P2238, P2239, P2252 and P2253 indicate malfunctions related to the bank 1 A/F sensor circuit.
• DTC P2241, P2242, P2255 and P2256 indicate malfunctions related to the bank 2 A/F sensor circuit.
• Bank 1 refers to the bank that includes cylinder No. 1.
• Bank 2 refers to the bank that includes cylinder No. 2.
MONITOR DESCRIPTION
The Air-Fuel Ratio (A/F) sensor varies its output voltage in proportion to the air-fuel ratio. If the A/F sensor
impedance (alternating current resistance) or voltage output deviates greatly from the standard range, the
ECM determines that there is an open or short malfunction in the A/F sensor circuit.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All:
P2238 and P2241 (open circuit between AF+ and AF-):
P2252
P2255AF-voltage is 0.5 V or less for 5.0 seconds or more (2
trip detection logic)• 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
• A/F sensor heater relay
• A/F sensor heater and relay circuits
•ECM
P2253
P2256AF-voltage is more than 4.5 V for 5.0 seconds or more
(2 trip detection logic)• 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
• A/F sensor heater relay
• A/F sensor heater and relay circuits
•ECM
Related DTCsP2238: A/F sensor (Bank 1) open circuit between AF+ and AF-
P2238: A/F sensor (Bank 1) short circuit between AF+ and AF-
P2238: A/F sensor (Bank 1) short circuit between AF+ and GND
P2239: A/F sensor (Bank 1) short circuit between AF+ and +B
P2241: A/F sensor (Bank 2) open circuit between AF+ and AF-
P2241: A/F sensor (Bank 2) short circuit between AF+ and AF-
P2241: A/F sensor (Bank 2) short circuit between AF+ and GND
P2242: A/F sensor (Bank 2) short circuit between AF+ and +B
P2252: A/F sensor (Bank 1) short circuit between AF- and GND
P2253: A/F sensor (Bank 1) short circuit between AF- and +B
P2255: A/F sensor (Bank 2) short circuit between AF- and GND
P2256: A/F sensor (Bank 2) short circuit between AF- and +B
Required Sensors / Components (Main) A/F sensor
Required Sensors / Components (Related) Engine Coolant Temperature (ECT) sensor, Crankshaft position sensor
Frequency of Operation Once per driving cycle
DurationP2238 and P2241 (open circuit between AF+ and AF-): 10 seconds
Others: 5 seconds
MIL Operation 2 driving cycles
Sequence of Operation None
The monitor will run whenever these DTCs are not
presentNone
AF+ terminal voltage 0.5 to 4.5 V
AF- terminal voltage 0.5 to 4.5 V
Difference between AF+ terminal and AF- terminal
voltage0.1 to 0.8 V
ECT 5
C (41F) or more (varies with ECT at engine start) DTC No. DTC Detection Condition Trouble Area

Page 675 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–3822GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
Others:
TYPICAL MALFUNCTION THRESHOLDS
P2238 and P2241 (Open circuit between AF+ and AF-):
P2238 and P2241 (Short circuit between AF+ and GND):

Page 676 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–383
ES
(f) 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:
�

Page 677 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–3842GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES– Following the A/F CONTROL procedure enables technicians to check and graph the voltage outputs of
both the A/F and HO2 sensors.
– To disp

Page 678 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–385
ES
B
C
A
(a) Remove the A/F relay from the No. 6 engine room relay
block.
(b) Measure the resistance according to the value(s) in the
table belo

Page 679 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–3862GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(a) Disconnect the A5 or A6 A/F sensor connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the val

Page 680 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–387
ES
NG
OK
A165205E01
REPAIR OR REPLACE HARNESS OR
CONNECTOR (A/F SENSOR - ECM)
REPLACE ECM (See page ES-498)

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