instrument panel TOYOTA CAMRY 1999 Service Manual PDF

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
Sensor
Engine Room R/B No.2
B±YJ19 J/C
2
1
II2II3
II3
EB
Heated
Oxygen
Sensor
(Bank 1
Sensor 2)
EC
Instrument
Panel J/B7
3 5
6
7
2L 2A
F611
F4
B±G
Battery B±R
2K
2J
W±B
3.3V
3.0V
AM2 B
W±R
J27
*1: w/o Immobiliser
*2: w/ Immobiliser
(*1)
(*2)
to Analog±Digital
Converter
E914 E8 13
(*1) (*2) J27
B±Y
B±Y
IG Switch
B±R
*3: California
(*6) (*3) (*6) (*3)
(*1)
2
MREL
E107
(*2)
EE
J27 J27
J/C
B BB±Y
II4
6
B±W(*2)
B±W(*2)
*5:TMC Made
*6:TMMK Made
L(*5)
(*3)
B±W(*5)
(*3)
BR
*4: Except California
DI±56
± DIAGNOSTICSENGINE (5S±FE)
291 Author: Date:
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 AF
and AF terminals of 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.

OBD II scan tool (excluding TOYOTA hand±held tester) displays the one fifth of the A/F sensor output
voltage which is displayed on the TOYOTA hand±held tester.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If the vehicle run out fuel, the air±fuel ratio is LEAN and DTC P0125 will be recorded.
The MIL then comes on.

Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame
records the engine conditions when the malfunction is detected, when troubleshooting it is useful for
determining whether the vehicle was running or stopped, the engine warmed up or not, the air±fuel
ratio lean or rich, etc. at the time of the malfunction.

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 2JB±Y
J/C
1B
2F5 B±R
1W
Heated
Oxygen
Sensor
(Bank 1
Sensor 1)
II2
II3Heated
Oxygen
Sensor
(Bank 1
Sensor 2)E03
B J19 J/C
BBB
3
MAIN 2A 2L 4
F4 F6FL
Block
B±GP±B
J27 J27
1
EB
EC
6
IGN
E03 L±YE1
E1 Instrument
Panel J/B
11
B±R
*1: w/o Immobiliser
*2: w/ Immobiliser
(*2) (*1)
E9 14E8 E9 E85
1
13
(*2) (*1)(*1) (*2)(*1) (*2) (*3)
EB±Y
(*3) (*3)
(*1)FL
*3: Except California BII3
E
B±YJ27 J27
MREL
E10 B±W
II4
6
B±W(*2)
(*3)
7(*2)(*2)
BR BR
DI±62
± DIAGNOSTICSENGINE (5S±FE)
297 Author: Date:
HINT:
After confirming DTC P0125, use the OBD II scan tool or TOYOTA hand-held tester to confirm voltage output
of the heated oxygen sensor (bank 1 sensor 1) from the CURRENT DATA.
If voltage output of the heated oxygen sensor (bank 1 sensor 1) is 0 V, heated oxygen sensor (bank 1 sensor
1) circuit may be open or short.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If the vehicle run out fuel, the air±fuel ratio is LEAN and DTC P0125 will be recorded.
The MIL then comes on.

Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame
records the engine conditions when the malfunction is detected, when troubleshooting it is useful for
determining whether the vehicle was running or stopped, the engine warmed up or not, the air±fuel
ratio lean or rich, etc. at the time of the malfunction.

A03626
ECM
#10
#20
#30
#40
E01
E02 Injector
No. 1
No. 2
No. 3
No. 4E9
E9
E9
E9
E9
E912
11
25
24
13
26 1
1
1
1 2
2
2
2L
R
Y
W
BR
BR B±R
B±R
B±R
B±R B
B
BB J21
J/CB B±R B±R
W±R
B±G
B
B±RIG Switch Battery
Instrument
Panel J/B
Engine Room
J/B No. 2 FL
Block 1
1
AM2
2L 4
2A 11C8
1K3
1K5
1B 5
MAIN
FL
EC II3 12
W±R
F4
F6 6
7
*1: w/o Immobiliser
*2: w/ Immobiliser(*1) (*2)
E910
E99
(*1) (*2)
DI±90
± DIAGNOSTICSENGINE (5S±FE)
325 Author: Date:
WIRING DIAGRAM

A07122
IG Switch
B±R
BatteryEngine Room
J/B No.2
76B±R13
1II3B±R
B
BR
Spark Plug
Spark Plug
2
3 2
3 4
Tr2 Igniter
No.1
Ignition
Coil
No.1
FL Block
Y±R
BR
B
20
19
IGT2
Tr1
E9
E9
E9
W±R
IGT1
IGF5 V
Tr1
Ignition Coil
No.2
Igniter
No.2
AA A
EC
Tr2
W±R
B±R 5 51B 1K
Instrument
W±R
W±R
2L 2A
4 1
AM2B
F4 F6 1
1
B±G
MAIN FL
3 1
4
J/C J25
*1: w/o Immobiliser
*2: w/ Immobiliser(*1) (*2)
ECM
E9 23
E9 22
E9 17
(*1) (*2)
W±R
Panel J/BB
B
BR
BR J19
J/C
DI±164
± DIAGNOSTICSENGINE (5S±FE)
399 Author: Date:
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If DTC P1300 is displayed, check ignition coil No.1 circuit.

If DTC P1300 is displayed, check ignition coil No.2 circuit.

Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame
records the engine conditions when the malfunction is detected, when troubleshooting it is useful for
determining whether the vehicle was running or stopped, the engine warmed up or not, the air±fuel
ratio lean or rich, etc. at the time of the malfunction.
1 Check for spark plug and spark of misifining cylinder (See page DI±89).
NG Go to step 4.
OK
2 Check for open and short in harness and connector in IGF signal circuit between
ECM and ignition coils (See page IN±31).
NG Repair or replace harness or connector.
OK

A03604
ECM
STP 4
E7
G±W G±WJ27 J28 1R 1R
1SJ27
J/C
AC Instrument Panel J/B
5
2 4
7
12
G±WLight
Failure
Sensor
Stop
Light
(LH) Stop
Light
(RH) G±R
2
52
5
W±B
W±B
BP High
Mount
Stop
Light
2
1R
A
A
J40
J/C
BL
1
W±B
Stop Light
Switch
2
BatteryW±B W
1C 7
STOP
41BInstrument
Panel J/B
B±R
B±R
F9 2 F9 1
ALT
F4MAIN
FL
FL Block
G±W
1
*1: w/o Immobiliser
*2: w/ Immobiliser(*1) (*2)
E79 DI±170
± DIAGNOSTICSENGINE (5S±FE)
405 Author: Date:
DTC P1520 Stop Light Switch Signal Malfunction (Only
for A/T)
CIRCUIT DESCRIPTION
This signal is used to detect when the brakes have been applied. The STP signal voltage is the same as
the voltage supplied to the stop lights.
The STP signal is used mainly to control the fuel cut±off engine speed. (The fuel cut±off engine speed is
reduced slightly when the vehicle is braking.)
DTC No.DTC Detecting ConditionTrouble Area
P1520Stop light switch does not turn off even once vehicle is driven
(2 trip detection logic)
Short in stop light switch signal circuit

Stop light switch

ECM
WIRING DIAGRAM
DI01H±07

A03606
ECM
STA 11
E1 E7 Instrument
Panel J/BPark/Neutral
Position Switch
Clutch Start
SwitchB
J7
J7
B J8CJ/C II2 10 11
II26
2
B±O
5
1 B±W (M/T)
GR B±W (A/T)
B±WB±O (A/T,*2)
GR (A/T,*1) B±W
J/C J29
B B
B 3
1J 4
1K
5
1B 1K5
STARTER
R
8
7
W±R
IG SwitchW±R
Engine Room
J/B No. 2B
B FL
Block
B±G
B±R
BatteryStarter 11
W±B
A
J11
J/C
IG
42L
1
2A
3
2B
AM2
MAINST
Relay11 2 J
92K 52D 1 1
F6 F41 5
2 3
B±O (*2)
S2B±R MAIN
FL
GR (*1)(A/T)
S1
*1: TMC Made
*2: TMMK Made
GR (*1)
(*2)
(M/T)
B±O (*2) GR (*1)
DI±176
± DIAGNOSTICSENGINE (5S±FE)
411 Author: Date:
Starter Signal Circuit
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery positive volt-
age is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection
volume for the starting injection control and after±start injection control.

WIRING DIAGRAM
DI01K±10

A07554
ECM
+B 12
E7 B±Y J/C
B
J28 J27B
B±Y
Instrument
Panel J/B 22J 2K7
W±R EFI
Relay 1 3
52
2F4
W±B
2A 1
AM2
42L
B
FL
Block
MAIN
FL
B±GEngine
J/B No.2
5
1B
531K71W
IGN
1K
Room
W±R
IG
Switch
7 6
14
E9
BR
B±R
EC
E1
F6
F4EB
B±R
1
1
EFI
J23
J/C A
A
Battery
BR
(*2) (*1)
*1: w/ Immobiliser
*2: w/o ImmobiliserE924 (*2)
MREL 7
E10 B±Y (*1) 6II4 B±W (*1)
± DIAGNOSTICSENGINE (5S±FE)
DI±179
414 Author: Date:
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to the coil, closing the contacts of
the EFI main relay (Marking: EFI) and supplying power to terminal +B of the ECM.
WIRING DIAGRAM
DI01L±05

A00355
IGN Fuse
Instrument Panel J/B
± DIAGNOSTICSENGINE (5S±FE)
DI±181
416 Author: Date:
4 Check EFI fuse (See page DI±173, step 2).
NG Check for short in all harness and components
connected to EFI fuse.
OK
5 Check for open in harness and connector between EFI main relay (Marking: EFI)
and battery, and EFI main relay and ECM (See page IN±31).
NG Repair or replace harness or connector.
OK
6 Check IGN fuse.
PREPARATION:
Remove the IGN fuse from the instrument panel J/B.
CHECK:
Check continuity of the IGN fuse.
OK:
Continuity
NG Check for short in all harness and components
connected to IGN fuse.
OK

A07555
Battery
EFI
AM2
123
3 1J
B2A
2J Instrument Panel J/B
B
1B 1W
37
1 5
IG Switch
1
B±W
B±RST RelayEFI Relay
5
6
2 3
1 11 410
4
5 4
5
A 2B STARTER
(M/T)
B±G
II23
B±W
II211
Starter
Park/Neutral
Position Switch
Clutch Start
Switch
5 7
B±R Engine Room J/B No.2
2C
2F IGN
FL Block1
2D1
BMAIN
B±O (*3) W±B
GR (*2)
10B
C
1
CIR
OPN
Relay
L±B
IGG±R
W±B
14 2L
E7FCECM
E01
1
S1S2
Engine Room R/B
No.1
2
J40
J/C
G±RL±B
5 93
Fuel
Pump
L±B
R
EB B±R
GR
W±R
B±W
B±WB±O (*3)(A/T)
BL
J/CB±R
J8
2K
J7
B
1 1 1
B 1K
1K
1K
8 7
6
EB1 4
J29
J/C J11
J/CF6 1 W±R
MAIN
FL4
5 2K
2
B±R (*4)
*1: w/ Immobiliser(*1)
MREL
E107 B±W
B
B
B±WII4
6
F41
GR (*2)
*2: TMC Made
*3: TMMK Made A
(*1)
(*1)
GR (*2)
B±O (*3)(M/T)
*4: w/o Immobiliser
EB1 B±R
B±R (*1)
B±R (*4)
IK17
55
7
ID1
7 W±B
W±B
DI±184
± DIAGNOSTICSENGINE (5S±FE)
419 Author: Date:
WIRING DIAGRAM

DI07A±06
FI0534
A06134
TOYOTA Hand±Held Tester
± DIAGNOSTICSENGINE (1MZ±FE)
DI±197
432 Author: Date:
PRE±CHECK
1. DIAGNOSIS SYSTEM
(a) Description

When troubleshooting OBD II vehicles, the only dif-
ference from the usual troubleshooting procedure
is that you connect to the vehicle the OBD II scan
tool complying with SAE J1978 or TOYOTA hand±
held tester, and read off various data output from
the vehicle's ECM.

OBD II regulations require that the vehicle's on±
board computer lights up the Malfunction Indicator
Lamp (MIL) on the instrument panel when the com-
puter detects a malfunction in the emission control
system/components or in the powertrain control
components which affect vehicle emissions, or a
malfunction in the computer. In addition to the MIL
lighting up when a malfunction is detected, the ap-
plicable Diagnostic Trouble Codes (DTC) pre-
scribed by SAE J2012 are recorded in the ECM
memory (See page DI±211).
If the malfunction does not reoccur in 3 consecutive trips, the
MIL goes off but the DTCs remain recorded in the ECM memory.

To check the DTC, connect the OBD II scan tool or
TOYOTA hand±held tester to Data Link Connector
3 (DLC3) on the vehicle. The OBD II scan tool or
TOYOTA hand±held tester also enables you to
erase the DTC and check freezed frame data and
various forms of engine data (For operating instruc-
tions, see the OBD II scan tool's instruction book.).
DTC include SAE controlled codes and manufac-
turer controlled codes. SAE controlled codes must
be set as prescribed by the SAE, while manufactur-
er controlled codes can be set freely by the
manufacturer within the prescribed limits (See DTC
chart on page DI±211).