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A
titania oxygen sensor is used on the Corolla GTS except
California-
and the V-6, 2WD California truck. The sensor uses a thick film of titania at
the tip of the element to detect oxygen concentrations in the exhaust gas. The
key difference between the titania sensor and the more common zirconia sensor
used on all other models is that the zirconia element generates voltages
according to the oxygen concentration in the exhaust gas.
Air/Fuel
Ratio Sensors of 1MZ-FE (5S-FE) Engines
(Toyota Part No. 89467-...)
The
A/F sensor signal voltage varies according to the amount of oxygen sensors in the
exhaust stream (see figure). Unlike the signal voltage from a heated oxygen
sensors (HO2S), the A/F sensors signal voltage increases as the air-fuel
mixture leans and decreases as the air-fuel mixture richens. The signal voltage
ranges from 0.48 to 0.80 volts! While the vehicle runs in closed loop mode, the
ECU uses the A/F sensor signal to lengthen or shorten the fuel injector pulse
width until attaining a stoichiometric air-fuel mixture.
The
A/F sensor contains a ECU-controlled heater. At start-up, the heater helps warm
the A/F sensors to quickly operating temperature. With minimal exhaust gas flow,
the heater keeps the A/F sensor from cooling down.
Photo Wide Range Air Fuel Ratio
Sensors.
The
voltage shown on the chart is what one would see if one were using the factory
Toyota scan tool to measure the A/F sensor parameter). Toyota
states that the output of this sensor can only be measured with a scan tool. (It
appears that the Toyota factory scan tool and the Vetronix Mastertech with the
Toyota OE software are the only tools that support this parameter currently).
This
is not true!
Besides, on Engines with these Sensors voltage
that corresponds with a specific A/F ratio is above (to 4.0 Volts).
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SAE Diagnostic Trouble Codes Toyota (Some)
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DTC
P0125 Insufficient Coolant Temp. For Closed Loop (P1154)
DTC
P0130 Heated Oxygen Sensor Circuit (Bank 1 Sensor 1)
DTC
P0133 Heated Oxygen Sensor Circuit Slow (Bank 1 Sensor 1)
DTC
P0135 Heated Oxygen Sensor Heater Circuit (Bank 1 Sensor 1)
DTC
P0136 Heated Oxygen Sensor Circuit (Bank 1 Sensor 2)
DTC
P0141 Heated Oxygen Sensor Heater Circuit (Bank 1 Sensor 2)
DTC P0150 Heated Oxygen Sensor Circuit (Bank 2 Sensor 1)
DTC
P0153 Heated Oxygen Sensor Circuit Slow (Bank 2 Sensor 1)
DTC
P0155 Heated Oxygen Sensor Heater Circuit (Bank 2 Sensor 1)
DTC
P0171 System Too Lean (Fuel Trim)
DTC
P0172 System Too Rich (Fuel Trim)
DTC
P0420 Catalyst System Efficiency Below Threshold
DTC , P1031,
P1032, P1051, P1052, P1131, P1132, P1151, P1152, P1154
DTC P1130 A/F Sensor Circuit Range Problem
DTC
P1133 A/F Sensor Circuit Response Malfunction
DTC
P1135 A/F Sensor Heater Circuit Malfunction
DTC
P1150 A/F Sensor Circuit Range Problem
DTC
P1153 A/F Sensor Circuit Response Malfunction
DTC
P1155 A/F Sensor Heater Circuit Malfunction
DTC P2195* Oxygen Sensor Signal Stuck
Lean (Bank 1 Sensor 1)
DTC P2196* Oxygen Sensor Signal Stuck
Rich (Bank 1 Sensor 1)
DTC P2197* Oxygen Sensor Signal Stuck
Lean (Bank 2 Sensor 1)
DTC P2198* Oxygen Sensor Signal Stuck
Rich (Bank 2 Sensor 1)
P2237*
Oxygen Sensor Pumping Current Circuit / Open (for A/F sensor) (B1S1)
P2238*
P2239*
P2240*
P2241*
P2242*
Oxygen Sensor Pumping Current Circuit / High (for A/F sensor) (B2S1)
P2251*
P2252*
Oxygen Sensor Reference Ground Circuit Low (for A/F sensor) (B1S1)
P2253*
Oxygen Sensor Reference Ground Circuit High (for A/F sensor) (B1S1)
P2254*
P2255*
P2256*
P2A00
A/F Sensor Circuit Slow Response (B1S1)
P2A03
A/F Sensor Circuit Slow Response (B2S1)
*
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a. Disconnect the A/F sensor connector.
b. Using an ohmmeter measure the resistance between terminals +B and HT.
Resistance:
0.8 - 1.4*
ohms at 20°C (68°F). If the resistance is not as specified, replace the sensor.
Torque: 44 Nm (440 kgf.cm, 31
ft.lbf)
c. Reconnect the A/F sensor connector.
*
On new Cars - to 3.4 ohms
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Parts
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Oxygen
Sensor
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Image
for location
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Front
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Federal
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California
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Rear
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Federal
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California
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On
2002 Toyota Camry LE
Engine:
3.0 L / 6 cyl / Gas / DOHC
Fuel: Fuel Injection
Ignition: Distributorless
Trans: 4-speed Automatic Transaxle (Electronic) U140E
Mileage: 43,318 mi
Emissions: OBD-II Compliant (ISO 9141-2)
VIN: 4T1BF32K52
(MCV30L-CEPNKA)
I
read DTC (by using scantools CJII and
Diagnostic Computer)
1130
"A/F Sensor Circuit Range/Performance Malfunction (Bank 1 Sensor 1)"
and
1135
"A/F Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
I
check and don't understand why this sensor not have Toyota Part No. (OEM)...
Use description for diagnostic courtesy by John Thornton I check Voltage and DC
on this Sensor (photo).
After installed "new" Sensor (from other, but good Camry) these codes
P1130 and P1135 returned. I don't know «what to do (make) and what to
check up?"
After install new Sensor - all is O'k
http://www.clublexus.com/forums/showthread.php?t=181807&page=1&pp=15
NOTE. Toyota has use new "Planar" A/F
Sensor. A second generation it Sensor was
developed to meet more stringent emission regulations. This A/F Sensor reaches
operating temperature faster that the previous (aka Cup Element) A/F sensor.
This allows the ECM to go into closed loop vuel control faster when the engine
is cold reducing cold start emission.
Like
previous O2 and AF Sensors, the planar AFS has ambient air on one side of the
ZrO2 and exhaust gases on the other side.
The
planar AFS has the same detecting range and signal characteristics as the
previous cup element. But heater element has higher resistance! This AFS
is not interchangeable with the older, cup element AFS. Heater Resistance (at 68
degr.F)=1.8-3.4 Ohm. The heater is imbedded into aluminum oxide. When the heater
is ON, the aluminum oxide conducts heat directly to the zirconium dioxide layer
bring the AFS to operating temperature quickly.
The heater monitor continuously detects over current or under current condition
and set DTC in one trip.
The
never planar AFS can be identified by its shorted body (13 mm).
Take a look this the better Descriptions for
Diagnostic these Sensors in "Story of the
Month" page.
Only
for Technicians (no amateur:-) go to Anaheim, California (September 24-26)
Air:Fuel
Sensors - Course #002 and #006
Presented by John Thornton
of Pro-Tec Auto Repair, Inc.
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Description.
Over the last 12 years, air/fuel sensors have slowly started
to replace oxygen sensors. While these sensors look similar to a
conventional oxygen sensor, operation and testing techniques are
significantly different.
This
class will discuss operation and testing of air/fuel sensors
used by Honda, GM (Bosch) and Toyota. The discussion will be
divided between 5 wire air/fuel sensors (Bosch/GM and Honda) and
4 wire air/fuel sensors (Toyota).
The
focus will be on sensor operation. Once we know how these
sensors work, testing becomes much easier. Testing techniques
will include the use of a labscope, scan tool and gas analyzer.
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Presenter.
John Thornton, a working technician, co-owns Pro-Tec Auto Repair
in the Chicago suburb of Naperville. Mr. Thornton specializes in
drivability diagnostics and is an ASE-certified Master
Technician with L1 certification.
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