1999 TOYOTA CAMRY Service Repair Manual

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Page 1265 of 4592

TOYOTA CAMRY 1999 Service Repair Manual A03008A03414
ON
VC
(+) E2
(±)
w/o Immobiliser
w/ Immobiliser
VC
(+) E2
(±)
± DIAGNOSTICSENGINE (5S±FE)
DI±53
288 Author: Date:
5 Check voltage between terminals VC and E2 of ECM connector.
PREP

Page 1266 of 4592

TOYOTA CAMRY 1999 Service Repair Manual DI±54
± DIAGNOSTICSENGINE (5S±FE)
289 Author: Date:
DTC P0121 Throttle/Pedal Position Sensor/Switch ºAº
Circuit Range/Performance Problem
CIRCUIT DESCRIPTION
Refer to DTC P0120 (Throttle/Pedal

Page 1267 of 4592

TOYOTA CAMRY 1999 Service Repair Manual A00477
Atmosphere
Cover
Exhaust GasPlatinum
Electrode
Solid Electrolyte
(Zirconia Element)
Platinum
Electrode
Heater
Air±Fuel Ratio
(V)
2.6 4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.4
12 13 14 15 16 17 18
Coatin

A00477
Atmosphere
Cover
Exhaust GasPlatinum
Electrode
Solid Electrolyte
(Zirconia Element)
Platinum
Electrode
Heater
Air±Fuel Ratio
(V)
2.6 4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.4
12 13 14 15 16 17 18
Coating (Ceramic)
ECM Monitored
A/F Sensor Voltage
19
± DIAGNOSTICSENGINE (5S±FE)
DI±55
290 Author: Date:
DTC P0125 Insufficient Coolant Temp. for Closed Loop
Fuel Control (Only for 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 A/F sensor has the characteristic that provides output voltage
* approximately proportional to the exist-
ing air±fuel ratio. The A/F sensor output voltage
* is used to provide feedback for the ECM to control the air±
fuel ratio.
By the A/F sensor output, the ECM can determine the deviation amount from the stoichiometric air±fuel ratio
and control the proper injection time immediately. If the A/F sensor is malfunctioning, ECM is unable to per-
form accurate air±fuel ratio control.
The A/F sensor is equipped with a heater which heats the zirconia element. The heater is controlled by the
ECM. When the intake air volume is low (the temp. of the exhaust gas is low), current flows to the heater
to heat the sensor for accurate oxygen concentration detection.
*: The voltage value changes at the inside of the ECM only.
DTC No.DTC Detecting ConditionTrouble Area
P0125
After engine is warmed up, A/F sensor output* does not
change when conditions (a), (b), and (c) continue for at least
1.5 min.:
*: Output value changes at inside of ECM only
(a) Engine speed: 1,500 rpm or more
(b) Vehicle speed: 40 ~ 100 km/h (25 ~ 62 mph)
(c) Throttle valve is not fully closedFuel system
Injector
Ignition system
Gas leakage on exhaust system
Open or short in A/F sensor circuit
A/F sensor
ECM
DI1JU±03

Page 1268 of 4592

TOYOTA CAMRY 1999 Service Repair Manual A03597
B±Y
FL
Block47
EFI
IGN
14 2
4 EFI
Relay
21
53
B±Y
BR
3
12 B
B
1
24 3 9
II3
J/CB
W±R
P±B
W
BG
P±B 56
2
5
1K
14
HT2 21 O 1W
E9E8
E9 E8
MAIN FLE8 1B
B 1ECMAF
OX2 HTAF
AF 1K
2F
E03 E1E04 A/F

Page 1269 of 4592

TOYOTA CAMRY 1999 Service Repair Manual ± DIAGNOSTICSENGINE (5S±FE)
DI±57
292 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 1270 of 4592

TOYOTA CAMRY 1999 Service Repair Manual DI±58
± DIAGNOSTICSENGINE (5S±FE)
293 Author: Date:
3 Check for open and short in harness and connector between ECM and A/F sen-
sor (See page IN±31).
NG Repair or replace harness or connector.

Page 1271 of 4592

TOYOTA CAMRY 1999 Service Repair Manual ± DIAGNOSTICSENGINE (5S±FE)
DI±59
294 Author: Date:
8 Check injector injection (See page SF±23).
NG Replace injector.
OK
9 Check gas leakage on exhaust system.
NG Repair or replace.
OK
Replace A

Page 1272 of 4592

TOYOTA CAMRY 1999 Service Repair Manual DI±60
± DIAGNOSTICSENGINE (5S±FE)
295 Author: Date:
12 Did vehicle runs out of fuel in the past?
NO Check for intermittent problems.
YES
DTC P0125 is caused by running out of fuel.

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