2004 Corolla Electrical Diagram -Engine Control
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Engine Control
Battery
1A1
30AMAIN
15AEFI
1 1
IA42
IM3
15AAM2
IM6
5 6
4
AM2 IG2
ST2
3 2
5 1
3 2
5 1
1 1 IL5 IK8IC12
EA13 EA110
E 3
IG4 ID19 IG1
1 1
5
4
BH
II19EA19
I10
ED
I 7
IA23 II212
2
1
AA AA
BE
IA510
II211
AG
AG
P
N
9
6
IA21
I10
FL MAIN2. 0L
B
BWB
B
B
BBR
GR
WB
B
GR
B
B
R
RW
BW
BO
BW
R
RW
R R
R R
R
B
B
B
B
BW
BW
BW
BO
BW
RW
RW
RW
B
R
BR
B
2 2
1 1
BWBW
EFIRelay
BW
(M/T)
(A/T)
(M/T)
(A/T)
(M/T)
(M/T
)
(A/T)
(A/T)
(M/T)
(A/T)
(M/T)
(A/T)
C/OPNRelay
F10
J2(A)
A2
J2(A),J3(B)
C8
Park/Neutral
PositionSW
ClutchStartSW
FuelPump
Ignition SW
JunctionConnector
JunctionConnector
M
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E 3
EC
E 2
E 3 E 3
E 2 E 2
AF AF AF
BH
AF
BB BB
AC AC
I10
2
1
I10
BO
BW
RW
R
B
B
GR
B
BW
(A/T)
(M/T)
(A/T)
+B GND +B GND +B GND +B GND
DUTY
IGT IGF IGT IGF IGF IGT IGF IGT
GND VISC
1
1 4 1 4 1 4 1 4
3 2
3 2 3 2 2 3 2 3
R(A/T)
RW
RL
YG
LY
GR
LY
W
RL
LY
LY
GR
LY
W
WB
BW
WB
BW
WB
BW
WB
BW
WB
BO
BW
WB
BW
WB
BW
BBB
WB
B(A/T)
B(M/T)
GR
WB
WB
WB
WB
WB
BL
LB
BB
WB
I2
I3
I4
I5
LY
YG
J 2(A), J 3(B)
J4(A),J5(B)
I1
V
3
Id
leAirControlValve
IgnitionCoiland
IgniterNo.1
IgnitionCoiland
IgniterNo.2
IgnitionCoiland
IgniterNo.3
IgnitionCoiland
IgniterNo.4
Junction Connector
JunctionConnector
VSV(EVAP)
B8
B9 D10
D3 A8 A11A10A9 A23
B5 A7 A6 A5 A12
IGT3 IGT4
E03 E01 E02
E 3(A), E 4(B), E 5(C), E 6(D)
Engine Control Module
FCSTA RSO
BATT IGT1 IGT2 IGFNSW
EVP
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Engine Control
2
1
2
1
2
1
2
1
I10 I10 I10
II18
2
1
10AMHTR/DEF IUP
From Power Source System (See Page 48)
IL8
II217 II210
2
1
I10
IG
A
1
I10
1
2
BO
BW
B B B
BR
BR
BO
BW BW
BW
BW
BW
BW
BW
W
BY
YLWBY
LWB
LR
GLW
YB
W
L
BWB
B BR
3 2 4
1 5
I6
I7
I8
I9
C2
V2
P1
M1
E2
J 7
Camsh
aftTimingOil
ControlValve(VVT)
EngineCoo
lantTemp.Sensor
InjectorNo.1
InjectorNo.2
InjectorNo.3
InjectorNo.4
JunctionConnector
MassAirFlowMeter
PowerStee
ringOil
PressureSW
VSV(CanisterClosedValve)
VG E2G THA
+B E2
A1 A2 A3 A4 A15 A14 D13
C1 B28 B29 B24 B32 A20 A19
OCVOCV+
CCV EC THW
E 3(A), E 4(B), E 5(C), E 6(D)
Engine Control Module
THAEVGVGPSW
#10 #20 #30 #40 ELS2
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AH AH
BF BF
AH
ID21 ID22
ID26
BD
AB AB
II216
2
1
ID28
ID27
15ATAIL
From Power Source System (See Page 48)
IH7
OFF
Tail
HeadLight
ControlSW
2 5
1 3
3 3
3 3
I 4
15ASTOP
IC14
1
2
IC5 IL1
3C13 3C11
II7
IJ6
BO
BR
BR
B B
B
BO
GW GW
G
Y
Y
BR
B
BR
BR
Y
Y
BR L
L
Y LG
BR
R
R
B
GW
GB
G
G
GW
Y
LW
Y
1 2 1 3
3 2
23 13
GSW2 IDL
BR
II27
BR
BR
J2(A),J3(B)
V
4
J
2(A),J3(B)
T
1
V
5
(Canada)
(Canada)
(USA)
(USA)
(USA) (USA)
C12
TAILRelay
GW
GW
RW
(w/CruiseControl)
A13
C14
S9
13
10
AirbagSensorAssembly
Combination SW
CruiseControlECU
Ju
nction
Connector
JunctionCo
nnector
StopLightSW
ThrottlePositionSensor
VaporPressureSensor
VSV(VaporPressureSensor)
A28 D21 A18 A21 D4
D12 C19 D14 D16
E2
E 3(A), E 4(B), E 5(C), E 6(D)
Engine Control Module
ELS F/PS IDLO
VC VTA TBPPTNK
STP
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Engine Control
4B2 4B1 4B4
4B3
II1
6
I10
II218 II29
H5
H8
I11
FANNO.2Relay
LGB
FANNO.1Relay
LG
A
/CSW
GW
M
/GCLTRelay
YB
P
ressureSW
Y
A
/CThermistor
BL
1
2
AE AE
BA
2
1
BO BO
(*1)
(*1)
BR
BR
B
B B
B W
W W W W(*1)
(*1)
B
2 4
1 3
2 4
1 3
B BR
B B B
(*1)
B BR
(*1)
(*1)
W
(*1)
W
PB
P
B
+B E1
+B E1
HT OX
HT OX
C3
C1
J2(A),J3(B)
BR
* 1 : Shielded
B(*1)
(*1)
CamshaftPositionSensor
CrankshaftPositionSensor
HeatedOxygenSensor
(Bank1
Sensor1)
HeatedOxygenSensor
(Bank1Sensor2)
JunctionConnector
D
efrosterModeDetectionSW
Y
A
/CSW
D
efrosterModeDetectionSW
D1B4 B23 C4 B21
D7 D6 C33
A/CS
31 CC2 A13 C32 27 A A34 A26
NE+
+B
E 3(A), E 4(B), E 5(C), E 6(D)
Engine Control Module
CFFAN ACLDACMG PRS THR NE G22+
HT1A OX1A OX1BHT1B
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II2
8
AA AA
BA BA BA BA
AA AA AA
EB
3B2 4C3
3B3 4C4
II11
IE
4B21
4B16
7. 5AOBD
From Power Source System (See Page 48)
IJ7
BO BO
RY
YR
B
VW
(*1)
(*1)
BR
BR
BR
LR
PB P
LR
PB
P BR
WB
RB
RB
(*1)
BR B W
VW
BYR
(*1
)
(*1
)
(*1
)
BR
WB
RY
BR
BR
BR
BR
BR
BR
2
7 13 15 5 4 16
SIL TC WFSE SG CG BAT
D 1
A
J4(A),J5(B)
J6
WB
1K1
Data Link Connector 3
JunctionConnector
Junction
Connector
KnockSensor
B7 B1 B2
D18 D20 D19
D11C14D5C17
E1 EKNK TACH
E 3(A), E 4(B), E 5(C), E 6(D)Engine Control Module
THWO W
SIL TC WFSE
KNK1 SPD
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Engine Control
10AGAUGE
From Power Source System (See Page 48)
IG2
3B22
3B203B16
II214
AB
BC
4C8
4C
9
I 2
IA614 II24
AC
BC
EB
Speedometer
Tachometer
32 4
33 8 19 10 9
17 3 1 2
YR
BVW
WG
RW
RW
BO
RW
BO
RY
YR
B
VW
Malfunction
IndicatorLamp
(w/o
ABS)
RW
(w/oABS)
RW
(w/oABS
)
SP1
BR
(w/oABS
)
(w/oABS)
BR
(w/oABS)
WG
(w/oABS)
WG
(w/ABS)
WG
(w/ABS)
WG
V 1
S 1
J2(A),J3(B)
J4(A),J5(B
)
C9
Skid Control ECUwith Actuator
CombinationMeter
JunctionConnector
JunctionConnector
Vehicle Speed Sensor(Combination Meter)
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The engine control system utilizes a microcomputer and maintains overall control of the engine, etc. An outline of enginecontrol is given here.
1. Input Signals
(1) Engine coolant temp. signal system
The engine coolant temp. sensor detects the engine coolant temp. and has a builtin thermistor with a resistance whichvaries according to the engine coolant temp. Thus the engine coolant temp. is input as a control signal to TERMINALTHW of the engine control module.
(2) Intake air temp. signal system
The intake air temp. sensor is installed in the mass air flow meter and detects the intake air temp., which is input as acontrol signal to TERMINAL THA of the engine control module.
(3) Power steering oil pressure signal system
Power steering oil pressure is detected by the power steering oil pressure SW and is input as a control signal toTERMINAL PSW of the engine control module.
(4) RPM signal system
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 G2+ of the engine control module, and engine RPM is inputinto TERMINAL NE+.
(5) Throttle signal system
The throttle position sensor detects the throttle valve opening angle, which is input as a control signal to TERMINAL VTAof the engine control module.
(6) Vehicle speed signal system
The vehicle speed is detected by the ABS speed sensor and the signal is input to TERMINAL SPD of the engine controlmodule via the comb. meter and the skid control ECU with actuator. (w/ ABS)The vehicle speed is detected by the vehicle speed sensor installed in the transaxle and the signal is input toTERMINAL SPD of the engine control module via the comb. meter. (w/o ABS)
(7) NSW signal system (A/T)
The Park/Neutral position SW detects whether the shift position is in neutral or not, and inputs a control signal toTERMINAL NSW of the engine control module.
(8) A/C SW signal system
The operating voltage of the A/C SW is detected and is input as a control signal to TERMINAL A/CS of the enginecontrol module.
(9) Battery signal systemVoltage is constantly applied to TERMINAL BATT of the engine control module. When the ignition SW is turned to on,voltage for engine control module operation is applied via the EFI relay to TERMINAL +B of the engine control module.
(10)Intake air volume signal system
Intake air volume is detected by the mass air flow meter, and is input as a control signal to TERMINAL VG of the enginecontrol module.
(11) STA signal system
To confirm that the engine is cranking, the voltage applied to the starter motor during cranking is detected and is input asa control signal to TERMINAL STA of the engine control module.
(12)Oxygen sensor signal system
The oxygen density in the exhaust gases is detected and is input as a control signal into TERMINALS OX1A and OX1Bof the engine control module. To maintain stable detection performance by the oxygen sensor, a heater is used forwarming the sensor. The heater is also controlled by the engine control module (HT1A and HT1B).
(13)Engine knock signal systemEngine knocking is detected by the knock sensor and input as a control signal to TERMINAL KNK1 of the engine controlmodule.
(14)Electrical load signal system
When systems which cause a high electrical load such as the rear window defogger, taillight are turned on, a signal isinput to TERMINALS ELS and ELS2 as a control signal.
(15)Vapor pressure signal system
Vapor pressure is detected by the vapor pressure sensor and is input as a control signal to TERMINAL PTNK of theengine control module.
System Outline
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Engine Control
2. Control System
SFI systemThe SFI system monitors the engine conditions through the signals, which are input from each sensor to the enginecontrol module. Based on this data and the program memorized in the engine control module, the most appropriate fuelinjection timing is decided and current is output to TERMINALS #10, #20, #30 and #40 of the engine control module,operating the injectors (to inject fuel). This is the system which finely controls the fuel injection in response to the drivingconditions, through the engine control module.
ESA systemThe ESA system monitors the engine conditions using the signals, which are input to the engine control module from eachsensor. Based on this data and the program memorized in the engine control module, the most appropriate ignition timingis decided and current is output to TERMINALS IGT1, IGT2, IGT3 and IGT4 of the engine control module. This outputcontrols the ignition coil and igniter No. 1 , No. 2 , No. 3 and No. 4 to produce the most appropriate ignition timing for thedriving conditions.
IAC systemThe IAC system increases the RPM and provides idle stability for fast idleup when the engine is cold, and when the idlespeed has dropped due to electrical load and so on. The engine control module evaluates the signals from each sensor,and outputs current to TERMINAL RSO to control the idle air control valve.
Knock control systemKnock control system controls the gate based on the engine rotation speed and detects knocking by the peak value of theknock sensor output during the gate open period, and then controls it to the most suitable ignition timing in proportion to
the driving condition. Evapoparge control systemThis system leads the vapor stuck to the canister to the serge tank in order not to agitate the air fuel by adjusting the fuelinjection volume.The signal at this time will be output from TERMINAL EVP of the engine control module to VSV (EVAP).
3. Diagnosis System
With the diagnosis system, when there is a malfunctioning in the engine control module signal system,the malfunctionsystem is recorded in the memory. The malfunctioning system can be found by reading the display (Code) of the malfunctionindicator lamp.
4. FailSafe System
When a malfunction occurs in any system, if there is a possibility of engine trouble being caused by continued control basedon the signals from that system, the failsafe system either controls the system by using the data (Standard values)recorded in the engine control module memory or else stops the engine.
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C/OPN Relay
53 : Closed with the starter running and the engine running
EFI Relay
53 : Closed with the ignition SW at ON or ST position
E2 Engine Coolant Temp. Sensor
12 : Approx. 15.04 k (20C, 4
F)
Approx. 5.74 k ( 0C, 32F)Approx. 2.45 k (20C, 68F)Approx. 0.318 k (80C, 176F)
E3 (A), E4 (B), E5 (C), E6 (D) Engine Control Module
Voltage at engine control module wiring connectors+BE1 : 914 volts (Ignition SW at ON position)VCE1 : 4.55.5 volts (Ignition SW at ON position)
VTAE1 : 0.30.8 volts (Ignition SW on and throttle valve fully closed): 3.24.9 volts (Ignition SW on and throttle valve fully open)
EVGE1 : 3.33.9 volts (Ignition SW at ON position)THAE1 : 0.53.4 volts (Engine idling and intake air temp. 080C, 32176F)THWE1 : 0.21.0 volts (Engine idling and engine coolant temp. 60120C, 140248F)
STAE1 : 614 volts (Engine cranking)IGT1, IGT2, IGT3, IGT4E1 : Pulse generation (Engine idling)IGFE1 : Pulse generation (Engine idling)FCE1 : 914 volts (Ignition SW on and engine stopping)
03 volts (Engine idling)WE1 : 914 volts (Engine idling and warning light off)
A/CSE1 : 914 volts (Ignition SW on and A/C SW off)SPDE1 : Pulse generation (Driving approx. 20 km/h)ELSE1 : 7.514 volts (Ignition SW on and taillight on)
ELS2E1 : 7.514 volts (Ignition SW on and rear window defogger on)NSWE1 : 03 volts (Engine cranking)
#10, #20, #30, #40E1 : Pulse generation (Engine idling)NE+ NE : Pulse generation (Engine idling)
RSOE1 : Pulse generation (Engine idling)
G2+ NE : Pulse generation (Engine idling)TBPE1 : 9.014.0 volts (Ignition SW on)
PTNKE1 : 3.03.6 volts (Ignition SW at ON position and remove fuel cap)OX1A, OX1BE1 : Pulse generation (Maintain engine speed at 2500 rpm for two minutes after warming up.)HT1A, HT1BE1 : 9.014.0 volts (Ignition SW at ON position)
03.0 volts (Engine idling)KNK1E1 : Pulse generation (Engine idling)
EVPE1 : 9.014.0 volts (Ignition SW at ON position)TACHE1 : Pulse generation (Engine idling)
Service Hints
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Engine Control
: Parts Location
Code See Page Code See Page Code See Page
A2 32 F10 36 J4 A 35
A13 34 H5 32 J5 B 35
C1 32 H8 35 J6 35
C2 32 I1 33 J7 35
C3 32 I2 33 K1 33C8 34 I3 33 M1 33
C9 34 I4 33 P1 33
C12 34 I5 33 S1 33
C14 34 I6 33 S9 35
D1 34 I7 33 T1 33
E2 32 I8 33 V1 33
E3 A 34 I9 33 V2 33
E4 B 34 I10 35 V3 33
E5 C 34 J2 A 35 V4 37
E6 D 34 J3 B 35 V5 37
: Relay Blocks
Code See Page Relay Blocks (Relay Block Location)
1 22 Engine Room R/B (Engine Compartment Left)
3 28 RH R/B (Right Side of the Instrument Panel Reinforcement)
: Junction Block and Wire Harness Connector
Code See Page Junction Block and Wire Harness (Connector Location)
IC 25 Engine Room Main Wire and Instrument Panel J/B (Lower Finish Panel)
ID 25 Floor Wire and Instrument Panel J/B (Lower Finish Panel)
IG
IH
II25
IJ Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
IK
IL 24
IM
1A 22 Engine Wire and Engine Room J/B (Engine Compartment Left)
3B
3C28 Instrument Panel Wire and RH J/B (Right Side of the Instrument Panel Reinforcement)
4B
4C30 Instrument Panel Wire and Center J/B (Behind the Combination Meter)
: Connector Joining Wire Harness and Wire Harness
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EA1 38 Engine Wire and Engine Room Main Wire (Inside of the Engine Room R/B)
IA2
IA4
IA540 Engine Room Main Wire and Instrument Panel Wire (Left Side of the Instrument Panel Reinforcement)
IA6
ID2 42 Instrument Panel Wire and Floor Wire (Left Kick Panel)
II1
II242 Engine Wire and Instrument Panel Wire (Blower Unit RH)
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: Ground Points
Code See Page Ground Points Location
EB
EC38 Left Side of the Cylinder Head
ED 38 Front Left Suspension Tower
IE 40 Behind the Combination Meter
IG 40 Right Kick Panel
BH 44 Under the Left Quarter Pillar
: Splice Points
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E2 I7 42 Instrument Panel Wire
E338 Engine Wire
I10
I2 I1142 Engine Wire
I442 Instrument Panel Wire
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