2000 TOYOTA CAMRY Service Repair Manual

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Page 2481 of 4770

TOYOTA CAMRY 2000 Service Repair Manual P21242 FI7210
A00027
Atmosphere
Flange
Platinum Electrode
Solid Electrolyte
(Zirconia Element)
Platinum Electrode
Heater
Coating (Ceramic)
Exhaust GasCoverIdeal Air±Fuel Mixture
Output Voltage
Richer

P21242 FI7210
A00027
Atmosphere
Flange
Platinum Electrode
Solid Electrolyte
(Zirconia Element)
Platinum Electrode
Heater
Coating (Ceramic)
Exhaust GasCoverIdeal Air±Fuel Mixture
Output Voltage
Richer ± Air Fuel Ratio ± Leaner
± DIAGNOSTICSENGINE (5S±FE)
DI±61
296 Author: Date:
DTC P0125 Insufficient Coolant Temp. for Closed Loop
Fuel Control (Except California Spec.)
CIRCUIT DESCRIPTION
To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three±way
catalytic converter is used, but for the most efficient use of the three±way catalytic converter, the air±fuel
ratio must be precisely controlled so that it is always close to the stoichiometric air±fuel ratio.
The heated oxygen sensor has the characteristic where by its output voltage changes suddenly in the vicinity
of the stoichiometric air±fuel ratio. This is used to detect the oxygen concentration in the exhaust gas and
provide feedback to the computer for control of the air±fuel ratio.
When the air±fuel ratio becomes LEAN, the oxygen concentration in the exhaust increases and the heated
oxygen sensor informs the ECM of the LEAN condition (small electromotive force: 0 V).
When the air±fuel ratio is RICHER than the stoichiometric air±fuel ratio the oxygen concentration in the ex-
haust gas is reduced and the heated oxygen sensor informs the ECM of the RICH condition (large electromo-
tive force: 1 V).
The ECM judges by the electromotive force from the heated oxygen sensor whether the air±fuel ratio is RICH
or LEAN and controls the injection time accordingly. However, if malfunction of the heated oxygen sensor
causes output of abnormal electromotive force, the ECM is unable to perform accurate air±fuel ratio control.
The heated oxygen sensors include a heater which heats the zirconia element. The heater is controlled by
the ECM. When the intake air volume is low (the temperature of the exhaust gas is low) current flows to the
heater to heat the sensor for accurate oxygen concentration detection.
DTC No.DTC Detecting ConditionTrouble Area
P0125
After engine is warmed up, heated oxygen sensor (bank 1
sensor 1) output does not indicate RICH even once when
conditions (a), (b) and (c) continue for at least 1.5 min.:
(a) Engine speed: 1,500 rpm or more
(b) Vehicle speed: 40 ~ 100 km/h (25 ~ 62 mph)
(c) Throttle valve does not fully closed
Fuel system
Injector
Ignition system
Gas leakage on exhaust system
Open or short in heated oxygen sensor (bank 1 sensor 1)
circuit
Heated oxygen sensor (bank 1 sensor 1)
ECM
DI00T±05

Page 2482 of 4770

TOYOTA CAMRY 2000 Service Repair Manual A03596
B±Y
Engine Room R/B No.2
Battery
IG Switch17
EFI
W±R7 7 2
5 EFI
Relay
5 3
24
W±BP±B
BR14 2314 2
3
9
II3
B±Y
B±Y
W±R B
W B±Y
B
BR6
128
25 1 2K
21 1KE8
E9
AM2
E8
E9ECM
OX1
OX2 HT1
HT2 1K

Page 2483 of 4770

TOYOTA CAMRY 2000 Service Repair Manual ± DIAGNOSTICSENGINE (5S±FE)
DI±63
298 Author: Date:
1 Are there any other codes (besides DTC P0125) being output?
YES Go to relevant DTC chart.
NO
2 Connect OBD II scan tool or TOYOTA hand±held

Page 2484 of 4770

TOYOTA CAMRY 2000 Service Repair Manual DI±64
± DIAGNOSTICSENGINE (5S±FE)
299 Author: Date:
4 Check whether misfire is occurred or not by monitoring DTC and data list.
NG Perform troubleshooting for misfire
(See page DI±163).
OK
5 Che

Page 2485 of 4770

TOYOTA CAMRY 2000 Service Repair Manual ± DIAGNOSTICSENGINE (5S±FE)
DI±65
300 Author: Date:
9 Check gas leakage on exhaust system.
NG Repair or replace.
OK
Replace oxygen sensor
(bank 1 sensor 1).
10 Perform confirmation driving patter

Page 2486 of 4770

TOYOTA CAMRY 2000 Service Repair Manual DI±66
± DIAGNOSTICSENGINE (5S±FE)
301 Author: Date:
DTC P0130 Heated Oxygen Sensor Circuit Malfunction
(Bank 1 Sensor 1) (Except California Spec.)
CIRCUIT DESCRIPTION
Refer to DTC P0125 (Insuffic

Page 2487 of 4770

TOYOTA CAMRY 2000 Service Repair Manual A01666
Vehicle speed
50 ~ 65 km/h
(31 ~ 40 mph)
Idling
IG SW OFF
(1)
1 ~ 3 min.1 min.Time
(2)(3)(4)
(5)
± DIAGNOSTICSENGINE (5S±FE)
DI±67
302 Author: Date:
CONFIRMATION DRIVING PATTERN
(1) Connec

Page 2488 of 4770

TOYOTA CAMRY 2000 Service Repair Manual P18349
DI±68
± DIAGNOSTICSENGINE (5S±FE)
303 Author: Date:
2 Check the output voltage of heated oxygen sensor during idling.
PREPARATION:
Warm up the heated oxygen sensor the engine at 2,500 rpm

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