TOYOTA CAMRY 1999 Service Repair Manual

ENGINE CONTROL
11
11 23 15
CIR OPN
RELAY 5A
IGN
30A
AM2 1K 5
2L 41K 31W7
1C 8 1B 5
2A 1
BK IB 1 7EB1 4 EB1 5 C 1
A 176
8 AM2 IG2
ST2B±R
L±B L±B L±B W±B W±BG± RB±RB±R W±R W±R B B±G
23 1520A
EFI FROM POWER SOURCE
SYSTEM (
SEE PAGE 44)
EB2K 7
2F 42C10
W±B W±B
IGNITION SW I10
BATTERY FL MAIN
3. 0WEFI
RELAY
JUNCTION
CONNECTOR J34 A
G±R
2J8
2J2
B±R
FUSIBLE
LINK BLOCK2C 5
W±B
B±R
IG1 2
IB1 4
13
24 B±R
FUEL TEMP. SENSOR AND
SHUTOFF VALVE
(
FUEL TANK) F1 7
R
B±Y
L±B
LG±B
G± R
B±R
B±R
BR B±Y
LG±B LG±B
C F 9 A , F11
BR
W±B
B±R
B±R
L±BR

P
N5
6
I 4
EC
5A STARTER
1K 4
B B
A 14 C3 C 20 C19 A 12A B
A 1A6A11 1J 3
4 1 4 1
A2 3 3 2B
B±Y B±Y
B± W
B±Y
Y±R W± R W±RBB±Y
B±WB±Y
B±Y
B±W
GR GR GR BR B±RBRG± R
W±R
BPARK/NEUTRAL
POSITION SW
JUNCTION
CONNECTOR J22P 1
JUNCTION
CONNECTOR
IGNITION COIL AND
IGNITER NO. 1
IGNITION COIL AND
IGNITER NO. 2
J18
I 2
I 3
A A
BRB±R
IG2 10 IG2 11
E 3B±Y
CC
C JUNCTION
CONNECTOR J19 IGTIGFIGFIGT
+B GND GND+B
IG312
B±RL±B
IG3 9
A EEAABB B±Y
J23
JUNCTION
CONNECTORB A, J24
E 4
ENGINE CONTROL MODULEB A, E 5 C, E 6 D, E 7A BB C
J 6
JUNCTION
CONNECTORB A, J 7
B±W
B±W
B±W
D 1
C 26
A A 22
W± BBR W± B R
B±Y
B±Y
L±B
LG±B
G± R
B±R
BR
BR B±R
BR BRE05 IGT2 IGF IGT1 +B1 FCTHCNG1 +B BATT NSW STA
B±R B±YB±W

ENGINE CONTROL
1 2
1 2
2 1
I 4
I 4 C 10 C23 D4 D 9A 2B14 B6
B 1
B 9
B 11
B 2
B 3
B 4
1 2
1 2 1 314 B B B B
2 3 1 223 BB
BR
B±Y B±YBR B±Y B±Y
BR Y
G±BY±B BRB±YY
LG
BR BRYW±B
W
P±B
P
G
BRB B±Y B±Y B±Y
PIM VC E2
VC VTA E2J18
JUNCTION
CONNECTOR
IDLE AIR CONTROL VALVE
VSV (
EGR)
FUEL SHUTOFF VAL VE
(
DELIVERY PIPE) FUEL SHUTOFF VALVE
(
FUEL PRESSURE
REGULATOR)
AIR FUEL RATIO SENSOR I 1
V 2
F 6F 7
A 8
MANIFOLD ABSOLUTE
PRESSURE SENSOR M 1
INTAKE AIR TEMP. SENSOR
ENGINE COOLANT TEMP. SENSOR I 8
E 3
ENGINE CONTROL MODULEB E 4 E 5ACE 6
(
SHIELDED)
+B AF +
AF± HT L±B
IG1 6
L±B Y±G
2
IB1Y
BR, , DE 7 ,
I 5 IG23
BR
THROTTLE
POSITION
SENSOR T 1BR
B±W
L
IG1 7
G
D 5D7
I 4D 6
23 23
11
G± BY
G±R
Y BR
BR BR
P±B BR
2
1
FUEL TEMP. SENSOR
(
DELIVERY PIPE) F 8
BR W±B
BR
PCNG2 PCNG1 VC VTA E2 PIM THA THW THCNG2 VCNG2 RSD EGR VCNG3 HTAF AF± AF+
BR
LGY
132
Y
B± Y
L
VOUT VC VOUT VC
GND GND
FUEL PRESSURE SENSOR
(
DELIVERY PIPE) F 4
FUEL PRESSURE SENSOR
(
FUEL PIPE) F 5
I 4I 4 I 4 I 4 BR BR BR BR

FROM POWER SOURCE SYSTEM (
SEE PAGE 44)
1C 91J11
1 2
2 1
IJ2 7
IJ2 9IG3 10 IG2 1
1 I 4 I 4
A 10 A 15A 21 D10 C18 B 10B 12 B 15 C4C17 C5D3
2 1B 8
2 A
B 12 3
A
1 3
2 5 1
BR
B±YBR B±Y
BR
BR
BR
B±Y TE1
B± LL±R L±W BR
W± L W±L W± LG L±Y
G L±Y R±BR±B R±W
R±BL±W
B± R
BR
L
B±W
G± O G± O
B±YB±Y
BR
E1 +B
10A TAIL
10A
MIRROR±
HEATER (
SHIELDED)
(
SHIELDED) L
B±R
DIODE
(
IDLE±UP)
DATA LINK
CONNECTOR 1
CRANKSHAFT
POSITION SENSOR
CAMSHAFT
POSITION SENSOR
JUNCTION
CONNECTORD 1
C 2
C 1
J12
D 6
JUNCTION CONNECTOR
A/C SWHEATER CONTROL SW
POWER STEERING OIL PRESSURE SWFROM MG
CLT RELAY
FROM
A/C DUAL
PRESSURE SW
TO A/C
MAGNETIC
CLUTCH AND
LOCK SENSORJ12
P 2 H 7
A12
BR
ENGINE CONTROL MODULEB E 4 E 5ACE 6 , , D, E 7
IG1 8D 12
LL JUNCTION
CONNECTOR J 8
C 5
CENTER AIRBAG
SENSOR ASSEMBLYIG1 9
B± R
A A
4
L
TE1 NE NE± G EL S
LOCK A/CS F/PS MGC PRS LOCK IN THRPSW
A/C EVAPORATOR
TEMP. SENSOR A11
B
IG1 1

ENGINE CONTROL
EC EC IG3 2IG31 IG2 12
C 21 B5A9A5A16
A 13 C22 C 13 B16 3 1
A 42
A
A
A
A
B±YBR BR BR
V± W
G±R
W
BR BR
BR
BR
BR
BR
BR
BR BR
BR BR BR
BR
BR
BRW G± R V±WB P±B
B P±B BR
BR
B±Y
(
SHIELDED)
HEATED OXYGEN
SENSOR H 6 E1 +B
HT OX
A C 16
BR
IG1 3 I 4
BR
C 2C12 C1C11 C15 C25 C14 C24
2 1
(
SHIELDED)
INJECTOR NO. 1 I 4
2 1
(
SHIELDED)
INJECTOR NO. 2 I 5
2 1
(
SHIELDED)
INJECTOR NO. 3 I 6
2 1
(
SHIELDED)
INJECTOR NO. 4 I 7
IG1 4
IH A AAA
A
J2 1
JUNCTION
CONNECTORBR
BR
BR
BR
B±Y
BR
BR
BR
BR
B±Y E03 E02 E01 E04 E1 #40 #40+ #30 #30+ #20 #20+ #10 #10+(
SHIELDED)
WG B±RBR B±WL
W±B W±B
SI L W SPD OX2 HT2E 4
ENGINE CONTROL MODULEB A, E 5 C, E 6 D, E 7
BR
JUNCTION
CONNECTOR J20
O
BRR

C
A
,
C
A 4
IF IG3 6A A
B B
B CA A B A A C7. 5A
OBD FROM POWER SOURCE SYSTEM (
SEE PAGE 44)
1J 1015A
STOP
1C 7
1J 71R51R 4 1J 81 2
5416 7
ACG SG W G± R V±W
BRBAT SIL
BR
W± B W±BBR
G± W BR
W± B
G± WWB
G±RSTOP LIGHT SW DATA LINK
CONNECTOR 3
S 4 D 3
JUNCTION CONNECTORB J 6 J 7
A
JUNCTION
CONNECTORB J23 J24A
JUNCTION
CONNECTOR J 9 C
A 8
I 6 I 1 JUNCTION CONNECTOR J 2
BR(
SHIELDED)
(
SHIELDED) W
,
D 2D8
B±O
G±W
G±W
Y±R
B± O G±WG±RY±R V± W
(
SHIELDED) B±YBR BR BR BR
B±YBR BR BR BRFUEL W FUEL STP TACH
(
SHIELDED)
B± Y
BR
BR
BR
BR
E 4
ENGINE CONTROL MODULEB A, E 5 C, E 6 D, E 7
BR
G±W W
J 6
JUNCTION
CONNECTORB A, J 7

ENGINE CONTROL
IG IG2 2
IH1 7IH12 IF1 10C 2B15 C6C5 C 7B14 10A
GAU GE FROM POWER SOURCE SYSTEM (
SEE PAGE 44)
1D 2
MALFUNCTION
INDICATOR LAMP
SPEEDOMETER
1J 1
IF13
DD
12 3 DBD
BV±WR±L
R±L R±L
V±W R±L R±L
G±R
L
P
BR PL G±R R±L
R±L
R±L
BR
COMBINATION METERC C11 C12B
JUNCTION
CONNECTOR
JUNCTION
CONNECTOR JUNCTION
CONNECTOR J15J 3
J19
VEHICLE SPEED SENSOR
(
COMBINATION METER) V 1
SI SE
IG+ IF1 6C 8
TACHOMETER
B±O B±O B±O
A F JUNCTION
CONNECTORJ24 B
, J23
JUNCTION
CONNECTORA
A F B FB F
FUEL
B 3 B 6
IH1 4 IG1 5IF1 9
G±W Y±R
G± WY±RFUEL
V±W
Y±R
G±R
G±W
B±O
Y±R

This system utilizes an engine control module and maintains overall control of the engine, transmission and so on. An outline
of the engine control is explained here.
1. INPUT SIGNALS
(1) Engine coolant temp. signal circuit
The engine coolant temp. sensor detects the engine coolant temp. and has a built±in thermistor with a resistance which
varies according to the engine coolant temp. thus the engine coolant temp. is input in the form of a control signal into
TERMINAL THW of the engine control module.
(2) Intake air temp. signal circuit
The intake air temp. sensor detects the intake air temp. , which is input as a control signal into TERMINAL THA of the
engine control module.
(3) Oxygen sensor signal circuit
The oxygen density in the exhaust gases is detected and input as a control signal into TERMINAL OX2 of the engine
control module.
(4) RPM signal circuit
Camshaft position and crankshaft position are detected by the camshaft position sensor and crankshaft position sensor.
Camshaft position is input as a control signal to TERMINAL G of the engine control module, and engine RPM is input
into TERMINAL NE.
(5) Throttle signal circuit
The throttle position sensor detects the throttle valve opening angle, which is input as a control signal into TERMINAL
VTA of the engine control module.
(6) Vehicle speed signal circuit
The vehicle speed sensor, installed inside the transmission, detects the vehicle speed and inputs a control signal into
TERMINAL SPD of the engine control module.
(7) Park/Neutral position SW signal circuit
The Park/Neutral position SW detects whether the shift position are in neutral, parking or not, and inputs a control signal
into TERMINAL STA of the engine control module.
(8) A/C SW signal circuit
The A/C amplifier is built in the engine control module. The signal from the A/C SW is input into TERMINAL A/CS of the
engine control module.
(9) Battery signal circuit
Voltage is constantly applied to TERMINAL BATT of the engine control module. When the ignition SW is turned on, the
voltage for engine control module start±up power supply is applied to TERMINAL +B of engine control module via EFI
relay.
(10) Intake air volume signal circuit
Intake air volume is detected by the manifold absolute pressure sensor (for manifold pressure) and is input as a control
signal into TERMINAL PIM of the engine control module.
(11) Starter signal circuit
To confirm whether the engine is cranking, the voltage applied to the starter motor during cranking is detected and the
signal is input into TERMINAL NSW of the engine control module as a control signal.
(12) Electrical load signal circuit
The signal when systems such as the rear window defogger, headlights, etc. Which cause a high electrical burden are
on is input to TERMINAL ELS as a control signal.
(13) Air fuel ratio signal circuit
The air fuel ratio is detected and input as a control signal into TERMINAL AF+ of the engine control module.
SYSTEM OUTLINE

ENGINE CONTROL
2. CONTROL SYSTEM
*SFI system
The SFI system monitors the engine condition through the signals, which are input from each sensor to the engine
control module. The best fuel injection volume is decided based on this data and the program memorized by the engine
control module, and the control signal is output to TERMINALS #10+, #20+, #30+ and #40+ of the engine control
module to operate the injector. (Inject the fuel). The SFI system produces control of fuel injection operation by the engine
control module in response to the driving conditions.
*ESA system
The ESA system monitors the engine condition through the signals, which are input to the engine control module from
each sensor the best ignition timing is detected according to this data and the memorized data in the engine control
module, and the control signal is output to TERMINALS IGT1 and IGT2. This signal controls the igniter to provide the
best ignition timing for the driving conditions.
*IAC system
The IAC system (Step motor type) increases the RPM and provides idling stability for fast idle±up when the engine is
cold and when the idle speed has dropped due to electrical load, etc. The engine control module evaluates the signals
from each sensor, outputs current to TERMINAL RSD , and controls the idle air control valve.
*Fuel control system
The engine control module operation outputs to TERMINAL FC and controls the CIR OPN relay. Thus controls the fuel
shutoff valve open and close.
*EGR control system
The EGR control system controls the VSV (EGR) by evaluating the signals from each sensor which are input to the
engine control module and by sending output to TERMINAL EGR of the engine control module.
*A/C conditioning operation system
In addition to the conventional A/C cut control, the engine control module performs the air conditioning operation as well
since the A/C amplifier function is built in it.
3. DIAGNOSIS SYSTEM
With the diagnosis system, when there is a malfunctioning in the engine control module signal system, the malfunction
system is recorded in the memory. The malfunctioning system can then be found by reading the display (Code) of the
malfunction indicator lamp.
4. FAIL±SAFE SYSTEM
When a malfunction occurs in any system, if there is a possibility of engine trouble being caused by continued control based
on the signals from that system, the fail±safe system either controls the system by using data (Standard values) recorded in
the engine control module memory or else stops the engine.
E4 (A), E5 (B), E6 (C), E7 (D) ENGINE CONTROL MODULE
BATT±E1 : Always 9.0±14.0 volts
+B±E1 :9.0±14.0 volts with the ignition SW at ON or ST position
VC±E2 :4.5± 5.5 volts with the ignition SW on
VTA±E2 :0.3± 0.8 volts with the ignition SW on and throttle valve fully closed
3.2±4.9 volts with the ignition SW on and throttle valve open
PIM±E2 :3.3± 3.9 volts with the ignition SW on
THA±E2 :0.5±3.4 volts with the ignition SW on and intake air temp. 20°C (68°F)
THW±E2 :0.2± 1.0 volts with the ignition SW on and coolant temp. 80°C (176°F)
STA±E1 :6.0±14.0 volts with the engine cranking
W±E1 :9.0±14.0 volts with the no trouble and engine running
TE1±E1 :9.0±14.0 volts with the ignition SW on
NSW±E1 :0± 3.0 volts with the ignition SW on and Park/Neutral position SW position P or N position
9.0±14.0 volts with the ignition SW on and except Park/Neutral position SW position P or N position
IGT1, IGT2±E1 : Pulse generation with the engine cranking or idling
#10+, #20+, #30+, #40+±E01, E02 :9.0±14.0 volts with the ignition SW on
SERVICE HINTS

: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A828F828J931
A1130F9A28J1231
A1230F11C28J1531
C128F1732J1831
C228H630J1931
C530H730J2031
C11B30I129J2131
C12C30I229J2231
D128I329J23A31
D330I429J24B31
D630I529J3432
E328I629M129
E4A30I729P129
E5B30I829P229
E6C30I1030S431
E7D30J231T129
F428J331V129
F528J6A31V229
F628J7B31
F728J831
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
126Engine Room R/B No.1 (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1B22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)1C22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1D22Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
1J
1K22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)1R22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1W
2A
2C24Engine Room Main Wire and Engine Room J/B No.2 (Engine Compartment Left)
2F
gg(g)
2J
2K24Cowl Wire and Engine Room J/B No.2 (Engine Compartment Left)
2L
g(g )
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
EB134Cowl Wire and Engine Room Main Wire (Under the Engine Room J/B No.2)
IB136Floor Wire and Cowl Wire (Left Kick Panel)
IF136Instrument Panel Wire and Cowl Wire (Under the Blower Motor)
IG1
IG238Engine Wire and Cowl Wire (Under the Blower Motor)
IG3
g()
IH138Engine Wire and Instrument Panel Wire (Under the Blower Motor)
IJ238Engine Room Main Wire and Cowl Wire (Right Kick Panel)