1999 TOYOTA CAMRY diagram

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

A00325
BatteryMAIN IG Switch
AM2EFI
MAIN
FLStarter ST RelayPark/Neutral Position Switch
(Clutch Start Switch)EFI RelayCIR OPN Relay
Fuel Pump
ECM
FC
Tr
STA
NE (STA Signal)
(NE Signal) IGN
STARTER ST
± DIAGNOSTICSENGINE (5S±FE)
DI±183
418 Author: Date:
Fuel Pump Control Circuit
CIRCUIT DESCRIPTION
In the diagram below, when the engine is cranked, current flows from terminal ST of the ignition switch to
the starter relay coil and also current flows to terminal STA of ECM (STA signal).
When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to coil of the circuit
opening relay, the relay switches on, power is supplied to the fuel pump and the fuel pump operates.
While the NE signal is generated (engine running), the ECM keeps Tr ON (circuit opening relay ON) and the
fuel pump also keeps operating.
DI01M±05

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

A03610
9
W±L
IK2
E9 10
II3
E9 18
LOCK IN
E1 14
EC
BRJ23
IK2 10
BR 1
2A/C Compressor
Lock SensorECM
BR W±L W±L
B
B BRJ/C
AA
A
BR
II3 J8
6J/C
*1: w/o Immobiliser
*2: w/ Immobiliser(*1) (*2)
E919
BR
E9 24
(*1) (*2)
DI±190
± DIAGNOSTICSENGINE (5S±FE)
425 Author: Date:
A/C Compressor Lock Sencor Circuit
CIRCUIT DESCRIPTION
This sensor sends 1 pulse par engine revolution to the ECM. If the number ratio of the compressor speed
divided by the engine speed is smaller than a predetermined value, the ECM turns the compressor off. And,
the indicator flashes at about 1 second intervals.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check compressor.
PREPARATION:
(a) Check the compressor drive belt tension (See page AC±16).
(b) Check if the compressor does not lock during operation with the engine started and blower switch and
A/C switch ON.
NG Adjust drive belt tension or repair compressor
(See page AC±17).
OK
DI01N±04

A03611
E8
II2 L±W1
L±R11
THR5 V ECM
E2
E89
BR
II23
BR A/C Evaporator
Temp. Sensor
2 1
*1: w/o Immobiliser
*2: w/ Immobiliser(*1)
(*2)
E810 DI±192
± DIAGNOSTICSENGINE (5S±FE)
427 Author: Date:
A/C Evaporator Temp. Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the temperature inside the cooling unit and sends the appropriate signals to the ECM.
WIRING DIAGRAM
DI01O±04

A06156
Engine Room J/B
EFI Relay
Junction
Connector
J20
Junction
Connector EFI
2A
2K2J
2C B
EB
7 1
2
5
13
2
F9
F4
11
B±G
Mass Air
Flow Meter
B±Y
B±Y
B±Y
R
R±BECM
E2GVG
E2 P 5B
B
9
4 A A
5
3
8
W±B
E10 B±W
E7 10
19
MRELB+ E10 Junction
ConnectorJ35 J36
A
A
B±W
Fusible
Link
Block
FL
MAIN
Battery
J27J28
II3
± DIAGNOSTICSENGINE (1MZ±FE)
DI±223
458 Author: Date:
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
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.

± DIAGNOSTICSENGINE (1MZ±FE)
DI±227
462 Author: Date:
DTC P0101 Mass Air Flow Circuit Range/Performance
Problem
CIRCUIT DESCRIPTION
Refer to DTC P0100 (Mass Air Flow Circuit Malfunction) on page DI±222.
DTC No.DTC Detecting ConditionTrouble Area
P0101
Conditions (a), (b) and (c) continue 10 sec. or more with
engine speed NE < 900:
(2 trip detection logic)
(a) Throttle valve fully closed
(b) Mass air flow meter output  2.2 V
(c) THW  70°C

Mass air flow meterP0101
Conditions (a) and (b) continue 10 sec. or more with engine
speed 1,500 rpm or more:
(2 trip detection logic)
(a) VTA  0.63 V
(b) Mass air flow meter output
1.06 V

Mass air flow meter
WIRING DIAGRAM
Refer to DTC P0100 (Mass Air Flow Circuit Malfunction) on page DI±222.
INSPECTION PROCEDURE
HINT:
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 Are there any other codes (besides DTC P0101) being output?
NO Replace mass air flow meter.
YES
Go to relevant DTC chart.
DI07G±06

FI6448
Intake Air Temp. Sensor
(Inside the Mass Air Flow Meter)ECM
5 V
THA
E2
E1 1
2R
L±Y
BR
E10E1022
18
± DIAGNOSTICSENGINE (1MZ±FE)
DI±229
464 Author: Date:
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If DTCs P0110 (Intake Air Temp. Circuit Malfunction), P0115 (Engine Coolant Temp. Circuit Malfunc-
tion), P0120 (Throttle/Pedal Position Sensor/Switch ºAº Circuit Malfunction) and P1410 (EGR Valve
Position Sensor Circuit Malfunction) are output simultaneously, E2 (Sensor Ground) may be open.

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.