1999 TOYOTA CAMRY Service Repair Manual

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Page 2185 of 4592

TOYOTA CAMRY 1999 Service Repair Manual DI±34
± DIAGNOSTICSENGINE
DTC P0116 Engine Coolant Temp. Circuit Range/Perfor-
mance Problem
CIRCUIT DESCRIPTION
Refer to DTC P0115 on page DI±30.
DTC No.DTC Detecting ConditionTrouble Area
If THW

Page 2186 of 4592

TOYOTA CAMRY 1999 Service Repair Manual P24296
Throttle Position
Sensor
VC
VTA
E2ECM
A09396
Throttle Position Sensor
ECM
E5
E5 1
3
2Y
LG
BR1
11
9VC
VTA
E25 V
E5
± DIAGNOSTICSENGINE
DI±35
DTC P0120 Throttle/Pedal Position Sensor/Switch ºA

Page 2187 of 4592

TOYOTA CAMRY 1999 Service Repair Manual FI7052
A00369
ON
VC
(+)
(±)
DI±36
± DIAGNOSTICSENGINE
INSPECTION PROCEDURE
HINT:
If DTCs P0105, P0106, P0110, P0115, P0120, P0180 and P0190 are output simultaneously, E2 (sen-
sor ground) may be o

Page 2188 of 4592

TOYOTA CAMRY 1999 Service Repair Manual A09283BE6653
A09264
ON
VTA
E2
(+)
(±)
BE6653A03008A09254
ON
VC
E2
(±)
(+)
± DIAGNOSTICSENGINE
DI±37
3 Check throttle position sensor (See Pub. No. RM654U, page SF±29).
NG Replace throttle positi

Page 2189 of 4592

TOYOTA CAMRY 1999 Service Repair Manual DI±38
± DIAGNOSTICSENGINE
OK
Check for open in harness and connector in
VC circuit between ECM and throttle position
sensor (See page IN±29).

Page 2190 of 4592

TOYOTA CAMRY 1999 Service Repair Manual ± DIAGNOSTICSENGINE
DI±39
DTC P0121 Throttle/Pedal Position Sensor/Switch ºAº
Circuit Range/Performance Problem
CIRCUIT DESCRIPTION
Refer to DTC P0120 on page DI±35.
DTC No.Detection ItemTrouble

Page 2191 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
14 15 16 17 19 21 22
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
14 15 16 17 19 21 22
Coating (Ceramic)
ECM Monitored
A/F Sensor Voltage
DI±40
± DIAGNOSTICSENGINE
DTC P0125 Insufficient Coolant Temp. for Closed Loop
Fuel Control
CIRCUIT DESCRIPTION
To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three±way cata-
lytic 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 closedOpen or short in A/F sensor (bank 1 sensor 1) circuit
A/F sensor (bank 1 sensor 1)
Air induction system
EGR system
Fuel pressure
Injector
Gas leakage on exhaust system
ECM
HINT:
After confirming DTC P0125, use the OBD II scan tool or TOYOTA hand-held tester to confirm voltage
output of A/F sensor from the CURRENT DATA.
The ECM controls the voltage of the AF+ and AF± terminals of the ECM to the fixed voltage. Therefore,
it is impossible to confirm the A/F sensor output voltage without OBD II scan tool or TOYOTA hand±
held tester.
DI1JU±04

Page 2192 of 4592

TOYOTA CAMRY 1999 Service Repair Manual A09395
B±Y
FL
Block47
EFI
IGN
14 2
4 EFI
Relay
21
53
B±Y
3
12 B
B
1
243 9
IG1B
W±R
P±B
G
P±B 56
2
5
1K
14
HT2 21 1W
E4E5
E6E5
MAIN FLE5 1B
B 1ECM
AF+
OX2 HTAF
AF± 1K
2F
E03 E1E04 A/F
Sensor
Engi

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