1999 TOYOTA CAMRY coolant

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

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

ELECTRONICALLY CONTROLLED TRANSMISSION AND A/T INDICATOR
72K
NO. 2
LOCK±UPNO. 1
B E 1
ELECTRONICALLY CONTROLLED
TRANSMISSION SOLENOIDAB 20A
EFI FROM POWER SOURCE SYSTEM (
SEE PAGE 44)
2J 8 3 15
2F 42J2
1 2
2 1
A 1B1B11 B4 B 9
C 6C7C8C16 A B
B B
EBEC B
A B3
A
B±YB±Y W±B W± B
BR
BR G±BLGY
BR L±B L±B
V
P
BR BREFI
RELAY
E 2
THROTTLE POSITION
SENSOR
ENGINE COOLANT TEMP. SENSORT 1
E 3 B
W
S2 S1 IG2 7 A 3A20
CRUISE CONTROL ECU C166 13 14
L±B L±R
Y±B
ECT IDL ODB ENGINE CONTROL MODULEB AC A 12
B±Y
B±R
JUNCTION
CONNECTOR J20JUNCTION
CONNECTOR J19
L±B5A
IGN
1W 7
1A 3B 1B
, E 4 , E 5 , E 6
J23
JUNCTION
CONNECTORB A, J24
A 65A
STARTER
1J 3
B±W B±W
JUNCTION
CONNECTOR J22
C 26
BR
B 2C 5
W±B
VC E2
VTA
+B BATT NSW VC VTA E2 THW
IDLO OD1 S2 S1 SL E05 E1
A 13
IG1 3
A A
JUNCTION
CONNECTOR J18 BRBR BR
2L 4
2A 1
B±G B
IGNITION SW
30A
AM2
BATTERY FL MAIN
3. 0WI10 7AM2 IG2
ST2
1B 51K 5
W± R W±R
C 1
A 1
F 9
FUSIBLE LINK
BLOCKC A, F11
A 22
B±R
6
W± B
2
B±R
+B1
E04I 4

The electronically controlled transmission, however, electrically controls the line pressure and lock±up pressure etc., through
the solenoid valve. Engine control module controls of the solenoid valve based on the input signals from each sensor which
makes smooth driving possible by shift selection for each gear which is most appropriate to the driving conditions at that
time.
1. GEAR SHIFT OPERATION
During driving, the engine control module selects the shift for each gear which is most appropriate to the driving conditions,
based on input signals from the engine coolant temp. sensor to TERMINAL THW of the engine control module, and also the
input signals to TERMINAL SPD of the engine control module from the vehicle speed sensor devoted to the electronically
controlled transmission. Current is then output to the electronically controlled transmission solenoid. When shifting to 1st
gear, current flows from TERMINAL S1 of the engine control module to TERMINAL (B) 3 of the solenoid to GROUND, and
continuity to the No.1 solenoid causes the shift.
For 2nd gear, current flows from TERMINAL S1 of the engine control module to TERMINAL (B) 3 of the solenoid to
GROUND, and from TERMINAL S2 of the engine control module to TERMINAL (B) 1 of the solenoid to GROUND, and
continuity to solenoids No.1 and No.2 causes the shift.
For 3rd gear, there is no continuity to No.1 solenoid, only to No.2, causing the shift.
Shifting into 4th gear (Overdrive) takes place when there is no continuity to either No.1 or No.2 solenoid.
2. LOCK±UP OPERATION
When the engine control module judges from each signal that lock±up operation conditions have been met, current flows
from TERMINAL SL of the engine control module to TERMINAL (A) 1 of the electronically controlled transmission solenoid to
GROUND, causing continuity to the lock±up solenoid and causing lock±up operation.
3. STOP LIGHT SW CIRCUIT
If the brake pedal is depressed (Stop light SW on) when driving in lock±up condition, a signal is input to TERMINAL STP of
the engine control module, the engine control module operates and continuity to the lock±up solenoid is cut.
4. OVERDRIVE CIRCUIT
*O/D main SW on
When the O/D main SW is turned on (O/D off indicator light turns off), a signal is input into TERMINAL OD2 of the engine
control module and engine control module operation causes gear shift when the conditions for overdrive are met.
*O/D main SW off
When the O/D main SW is turned to off, the current through the O/D off indicator light flows through the O/D main SW to
GROUND, causing the indicator light to light up. At the same time, a signal is input into TERMINAL OD2 of the engine
control module and engine control module operation prevents shift into overdrive.
E4 (A), E5 (B), E6 (C) ENGINE CONTROL MODULE
S1, S2±E1 :9.0±14.0 volts with the solenoid on
0±1.5 volts with the solenoid off
L±E1 :7.5±14.0 volts with the shift lever at L position
2±E1 :7.5±14.0 volts with the shift lever at 2 position
R±E1 :7.5±14.0 volts with the shift lever at R position
STP±E1 :9.0±14.0 volts with the brake pedal depressed
THW±E2 :0.2±1.0 volts with the ignition SW on and coolant temp. 80°C (176°F)
VTA±E2 :0.3±0.8 volts with the throttle valve fully closed
3.2±4.9 volts with the throttle valve fully opened
VC±E2 :4.5±5.5 volts
OD2±E1 :9.0±14.0 volts with the O/D main SW turned on
0±3.0 volts with the O/D main SW turned off
+B±E1 :9.0±14.0 volts
O2 O/D MAIN SW
2±4 : Closed with the O/D main SW off, open with the O/D main SW on
SYSTEM OUTLINE
SERVICE HINTS

L PART NUMBER OF CONNECTORS
Code Part Name Part NumberCodePart Name Part Number
Note : Not all of the above part numbers of the connector are established for the supply. In case of ordering
a connector or terminal with wire, please confirm in advance if there is supply for it using ªParts Catalog
Newsº (published by Parts Engineering Administration Dept.).
A 1A/C Condenser Fan Motor90980±10928
A 2A/C Magnetic Clutch and Lock Sensor90980±10942
A 3A/C Triple Pressure SW (A/C Dual and
Single Pressure SW)90980±10943
A 4ABS Actuator90980±11413
A 5ABS Actuator90980±10891
A 6ABS Speed Sensor Front LH90980±11075A 7ABS Speed Sensor Front RH90980±11 075
A 8Air Fuel Ratio Sensor90980±11178
A 9Airbag Sensor Front LH90980±11856A10Airbag Sensor Front RH90980±11 856
A11A/C Evaporator Temp. Sensor90980±10825
A12A/C SW90980±10631
A13ABS ECU90980±11424
A14ABS ECU90980±11390
A15Air Vent Mode Control Servo Motor90980±11165
A16Airbag Squib (Front Passenger Airbag
Assembly)90980±11884
A17Airbag Squib (Steering Wheel Pad)90980±10850
A18Ashtray Illumination81945±33010
A19ABS Speed Sensor Rear LH90980±11060A20ABS Speed Sensor Rear RH90980±11060
B 1Brake Fluid Level Warning SW90980±11207
B 2Blower Motor90980±10903
B 3Blower Resistor90980±10976
B 4Blower SW90980±10877
B 5Buckle SW LH90980±10825
C 1Camshaft Position Sensor90980±10947C 2Crankshaft Position Sensor90980±10947
C 3Cruise Control Actuator90980±11150
C 4Center Airbag Sensor Assembly90980±11869
C 5Center Airbag Sensor Assembly90980±11872
C 6Center Airbag Sensor Assembly90980±11867
C 7Cigarette Lighter90980±10760
C 8Cigarette Lighter Illumination90980±11148
C 9Clock90980±11013
C10Combination Meter90980±11114
C11Combination Meter90080±98046
C12Combination Meter90980±11115
C13Combination SW90980±11594
C14Combination SW90980±11616
C15Combination SW90980±11672
C16Cruise Control ECU90980±11391
C17Condenser90980±10860
D 1Data Link Connector 190980±11323
D 2Data Link Connector 290980±11417
D 3Data Link Connector 390980±11665
D 4Diode (Courtesy)90980±10962D 5Diode (Dome)90980±10962
D 6Diode (Idle±Up)90980±11071
D 7Door Courtesy SW Front LH
D 8Door Courtesy SW Front RH90980±10871D 9Door Courtesy SW Rear LH90980±10871
D10Door Courtesy SW Rear RH
D11Door Key Lock and Unlock SW Front LH90980±11490D12Door Key Lock and Unlock SW Front RH90980±11490
D13Door Lock Control SW RH90980±11326
D14Door Lock Motor and Door Unlock
Detection SW Front LH
D15Door Lock Motor and Door Unlock
Detection SW Front RH
90980±11150
D16Door Lock Motor and Door Unlock
Detection SW Rear LH90980±11 150
D17Door Lock Motor and Door Unlock
Detection SW Rear RH
E 1Electronically Controlled Transmission
Solenoid90980±11156
E 2Electronically Controlled Transmission
Solenoid90980±11143
E 3Engine Coolant Temp. Sensor90980±10737
E 4Engine Control Module90980±11392
E 5Engine Control Module90980±11391
E 6Engine Control Module90980±11390
E 7Engine Control Module90980±11408
F 1Front Turn Signal Light and Parking Light
LH
90980±11020
F 2Front Turn Signal Light and Parking Light
RH90980±11020
F 3Front Wiper Motor90980±11599
F 4Fuel Pressure Sensor (Delivery Pipe)90980±10845F 5Fuel Pressure Sensor (Fuel Pipe)90980±10845
F 6Fuel Shutoff Valve (Delivery Pipe)90980±11156
F 7Fuel Shutoff Valve (Fuel Pressure
Regulator)90980±11038
F 8Fuel Temp. Sensor (Delivery Pipe)90980±10737
F 9Fusible Link Block90980±09566
F10Fusible Link Block90980±09567
F11Fusible Link Block90980±09566
F12Fusible Link Block99141±13006
F13Fusible Link Block82620±06010
F14Fusible Link Block90980±11579
F15Front Door Speaker LH90980±10825F16Front Door Speaker RH90980±10825
F17Fuel Temp. Sensor and Fuel Shutoff Valve
(Fuel Tank)90980±10795
G 1Generator90980±09213

M
5
678
2 CAMRY CNG (
Cont' d)A
B
CB±Y
NL KJI H G
Y±B
B±Y
THW THAB± Y
VC
B 1+B
VTA
B 1112 A
B±Y
BATT
PIM
B 21AB±Y
B±Y
RSD
THCNG1
D 110 CW
LG±B
THR
B 10L±R
EGR
W
A 523 CP±B
G± R
VCNG3
FC
A 14
G± R
PSWB±L
1
Y
LG
B±Y
LG±B
L±R
G± R
B±Y2
13
I 1
I DL E A I R CONT ROL V AL VE
1 2
P 2
POWER ST EERI NG
OI L PRESSURE SW
4DP1 2B± Y
B± YV 2
VSV(
EGR) F 6
FUEL SHUTOFF VALVE
(
Deliv ery Pipe) B± Y
B B
B B BB B
B±Y
J18
JUNCTION
CONNECTOR
Engine Control
(
Cont . next page)
ENGINE CONTROL MODULE B± R
D
E
F
BRE 3
ENGINE COOLANT
TEMP. SENSOR
I 8
I NTAKE AI R TEMP.
SENSORG±B BR1
21
2A
B
MC L±B
BR
A
B
1IG3
W±B
HT2 OX2 SIL
SI L
J UNCTI ON CONNECTOR
A C A ASG
B B B A CG
W± B
71J
BR 81J7
IF5 D 3
DATA LINK
CONNECTOR 3
42IG3
(
Shielded)
3
12 I G2 241
CBBR P±B P±B
BB±Y
A
J 9
JUNCTION
CONNECTORW± B BR
HT
E1 OX
+B
D
E
Instrument
panel
brace LHW WJ 2
JUNCTION
CONNECTOR
(
Shielded)
(
Shielded)
16BAT
BR
BR CC
BR
21 C B 5 16 A
H 6
HEATED OXYGEN SENSOR
B J 6 J 7A,
, E 5 E 4 A B , E 6 C , E 7 D
WFr om Center
Airbag Sensor
Assembly< 14±4>
3B 4B 22A
B±R
6IG1
9D
F 7
FUEL SHUTOFF VALVE
(
Fuel Pressure Regulator)
Y±G L±B L±B
2 1
9B
BR
6D 7D 5D
OB
F 4
FUEL PRESSURE SENSOR
(
Deliver y Pipe) F 5
FUEL PRESSURE SENSOR
(
Fuel Pipe) F 8
FUEL TEMP. SENSOR
(
Deliver y Pipe)
1
2P±B BR
12 B
BR
BRC W± B 4IH1 5IG1 8IG1
2D 8D 12D9IF1
A A
LL
Y±R
G±W Y± R
G±W Y±RL
Fr om Combination
Meter< 17±6>Fr om Center Airbag
Sens or Ass embly
< 14±4>
3D
13
B± Y G± O
B± R
9IG1
Fr om º TAI Lº Fuse
<8±2>
Fr om º MI RROR±HEATERº
Fuse< 18±1>
2
B±R
D 6
DI ODE
(
Idle±Up) 2 1 2 1
3 3
G±B
G± R
G± R
BR
G±BY
Y
J 8
JUNCTION
CONNE CTOR
Y LG
Y
G± RPCNG1 P CNG2 THCNG2 E2 VCNG2 +B 1 FUE L F UE LW F/ PS
EL S GND VOUT GND VOUT
VC VCBR BR BR BR
BR BR

G ELECTRICAL WIRING ROUTING
Position of Parts in Engine Compartment
[1MZ±FE]
A 1 A/C Condenser Fan Motor
A 2 A/C Magnetic Clutch and Lock Sensor
A 3 A/C Triple Pressure SW
(A/C Dual and Single Pressure SW)
A 4 ABS Actuator
A 5 ABS Actuator
A 6 ABS Actuator and ECU
A 7 ABS and Traction Actuator
A 8 ABS and Traction Actuator
A 9 ABS Speed Sensor Front LH
A 10 ABS Speed Sensor Front RH
A 28 Air Fuel Ratio Sensor (Bank 1 Sensor 1)
A 29 Air Fuel Ratio Sensor (Bank 2 Sensor 1)
A 30 A/C Ambient Temp. Sensor
A 31 Airbag Sensor Front LH
A 32 Airbag Sensor Front RH
B 1 Back±Up Light SW
B 2 Brake Fluid Level Warning SW
C 1 Camshaft Position Sensor
C 2 Crankshaft Position Sensor
C 3 Cruise Control Actuator
D 1 Data Link Connector 1
D 2 Daytime Running Light Resistor
D 3 Diode (A/C)E 1 EGR Gas Temp. Sensor
E 2 EGR Valve Position Sensor
E 3 Electronically Controlled Transmission Solenoid
E 5 Engine Coolant Temp. Sensor
E 6 Engine Hood Courtesy SW
F 1 Front Turn Signal Light and Parking Light LH
F 2 Front Turn Signal Light and Parking Light RH
F 3 Front Wiper Motor
F 4 Fusible Link Block
F 5 Fusible Link Block
F 6 Fusible Link Block
F 7 Fusible Link Block
F 8 Fusible Link Block
F 9 Fusible Link Block
G 1 Generator
G 2 Generator
H 1 Headlight LH
H 2 Headlight RH
H 3 Heated Oxygen Sensor (Bank 1 Sensor 1)
H 4 Heated Oxygen Sensor (Bank 2 Sensor 1)
H 5 Horn (High)
H 6 Horn (Low)