1999 TOYOTA CAMRY Service Repair Manual

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Page 4065 of 4592

TOYOTA CAMRY 1999 Service Repair Manual 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
(
SHI

Page 4066 of 4592

TOYOTA CAMRY 1999 Service Repair Manual 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

Page 4067 of 4592

TOYOTA CAMRY 1999 Service Repair Manual 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

Page 4068 of 4592

TOYOTA CAMRY 1999 Service Repair Manual 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 coola

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

Page 4069 of 4592

TOYOTA CAMRY 1999 Service Repair Manual 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 vo

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

Page 4070 of 4592

TOYOTA CAMRY 1999 Service Repair Manual : PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A828F828J931
A1130F9A28J1231
A1230F11C28J1531
C128F1732J1831
C228H630J1931
C530H730J2031
C11B30I129J2131
C12C30I229J2231
D128I329J23A31
D330I429J2

Page 4071 of 4592

TOYOTA CAMRY 1999 Service Repair Manual ENGINE CONTROL
: GROUND POINTS
CodeSee PageGround Points Location
EB34Left Radiator Side Support
EC34Intake Manifold
IF36Instrument Panel Brace LH
IG36Instrument Panel Brace RH
IH36Cowl Side Panel RH

Page 4072 of 4592

TOYOTA CAMRY 1999 Service Repair Manual MEMO

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