Ecu TOYOTA CAMRY 1994 XV10 / 4.G Wiring Diagrams Workshop Manual

11
FINDING A SHORT CIRCUIT
(a) Remove the blown fuse and disconnect all loads of the
fuse.
(b) Connect a test light in place of the fuse.
(c) Establish conditions in which the test light comes on.
Example:
± Ignition SW on
± Ignition SW and SW 1 on
± Ignition SW, SW 1 and Relay on (Connect the
Relay) and SW 2 off (or Disconnect SW 2)
(d) Disconnect and reconnect the connectors while
watching the test light.
The short lies between the connector where the test
light stays lit and the connector where the light goes
out.
(e) Find the exact location of the short by lightly shaking
the problem wire along the body.
CAUTION
(a) Do not open the cover or the case of the ECU unless
absolutely necessary. (If the IC terminals are touched,
the IC may be destroyed by static electricity.)
(b) When replacing the internet mechanism (ECU part) of
the digital meter, be careful that no part of your body or
clothing comes in contact with the terminals of leads
from the IC, etc. of the replacement part (spare part).
DISCONNECTION OF MALE AND FEMALE
CONNECTORS
To pull apart the connectors, pull on the connector itself, not the
wire harness.
HINT: Check to see what kind of connector you are disconnecting
before pulling apart.

15
ABBREVIATIONS
ABBREVIATIONS
The following abbreviations are used in this manual.
ABS = Anti±Lock Brake System
ACIS = Acoustic Control Induction System
A/C = Air Conditioning
A/T = Automatic Transmission
COMB. = Combination
C/P = Coupe
ECU = Electronic Control Unit
EFI = Electronic Fuel Injection
EGR = Exhaust Gas Recirculation
ESA = Electronic Spark Advance
Ex. = Except
FL = Fusible Link
IAC = Idle Air Control
ISC = Idle Speed Control
J/B = Junction Block
LH = Left-Hand
MFI = Multiport Fuel Injection
M/T = Manual Transmission
O/D = Overdrive
R/B = Relay Block
RH = Right±Hand
RPM = Engine Speed
S/D = Sedan
SFI = Sequential Multiport Fuel Injection
SRS = Supplemental Restraint System
SW = Switch
TEMP. = Temperature
VSV = Vacuum Switching Valve
W/G = Wagon
w/ = With
w/o = Without
*The titles given inside the components are the names of the terminals (terminal codes) and
are not treated as being abbreviations.

32
ELECTRICAL WIRING ROUTING
Position of Parts in Instrument Panel
A 10 A/C Amplifier C 12 Combination SW
A 11 A/C Evaporator Temp. Sensor C 13 Combination SW
A 12 A/C SW C 14 Cooling Fan ECU
A 13 ABS ECU C 15 Cruise Control Clutch SW (M/T)
A 14 ABS ECU C 16 Cruise Control ECU
A 15 Airbag Squib (Steering Wheel Pad)
A 16 Air Inlet Control Servo Motor D 3 Data Lik Connector 2 (TDCL (Toyota Diagnostic
A 17 Air Vent Mode Control Servo Motor Communication Link))
A 18 Ashtray Illumination D 4 Daytime Running Light Relay (Main)
A 22 Airbag Squib (Front Passenger Airbag Assembly) D 5 Diode (for Cruise Control)
D 6 Diode (for Idle±Up)
B 3 Back Door Lock Control SW D 7 Diode (for Courtesy)
B 4 Blower Motor D 8 Door Lock Control Relay)
B 5 Blower Resistor D 24 Date Link Connector 3
B 6 Blower SW D 25 Diode (for Tension Reducer)
B 7 Buckle SW LH (w/ Power Seat)
B 8 Buckle SW LH (w/o Power Seat) E 6 Electronic Controlled Transmission Pattern Select SW
B 10 Buckle SW RH E 7 Engine Control Module (Engine and Electronic
Controlled Transmission ECU) (A/T)
C 3 Center Airbag Sensor Assembly E 8 Engine Control Module (Engine and Electronic
C 4 Cigarette Lighter Controlled Transmission ECU) (A/T)
C 5 Cigarette Lighter Illumination E 9 Engine Control Module (Engine and Electronic
C 6 ClockControlled Transmission ECU) (A/T)
C 7 Clutch Start SW (M/T) E 10 Engine Control Module (Engine and Electronic
C 8 Combination Meter Controlled Transmission ECU) (A/T)
C 9 Combination Meter E 11 Engine Control Module (Engine ECU) (M/T)
C 10 Combination Meter E 12 Engine Control Module (Engine ECU) (M/T)
C 11 Combination Meter E 14 Engine Control Module (Engine ECU) (M/T)

33
Position of Parts in Instrument Panel
G 3 Glove Box Light O 5 O/D Main SW and A/T Indicator Light (Shift Lever)
G 4 Glove Box Light SW
P 2 Parking Brake SW (for 1MZ±FE)
H 7 Hazard SW P 3 Parking Brake SW (for 5S±FE)
H 8 Heater Control SW (for Push Control SW Type) or Air P 4 Power Seat Control SW
Vent Mode Control SW (for Lever Control SW Type) P 5 Power Seat Motor (for Front Vertical Control)
H 9 Heated Oxygen Sensor (Bank 1 Sensor 2) P 6 Power Seat Motor (for Rear Vertical Control)
P 7 Power Seat Motor (for Reclining Control)
I 11 Ignition Key Cylinder Light P 8 Power Seat Motor (for Slide Control)
I 12 Ignition SW and Unlock Warning SW
I 13 Integration Relay R 2 Radio and Player (w/ CD Player)
R 3 Radio and Player (w/o CD Player)
J 1 Junction Connector R 4 Radio and Player (w/o CD Player)
J 2 Junction Connector R 5 Rear Window Defogger SW
J 3 Junction Connector R 6 Remote Control Mirror SW
J 4 Junction Connector (for SRS System) R 7 Rheostat
J 7 Junction Connector
S 5 Shift Lock ECU
K 3 Key Interlock Solenoid S 8 Stereo Component Amplifier
S 9 Stereo Component Amplifier
N 2 Noise Filter (for Stop Light) S 10 Stop Light SW
N 3 Noise Filter (for Stop Light)

52
POWER SOURCE (Current Flow Chart)
The chart below shows the route by which current flows from the battery to each electrical source (Fusible Link,
Circuit Breaker, Fuse, etc.) and other parts.
The next page and following pages show the parts to which each electrical source outputs current.
Starter Battery
FL MAIN 2.0L30A AM2Ignition SW
(AM2)
Headlight Relay
(Point Side)
40A DEFOG 100A ALTGenerator
(Alternator) 7.5A SRS
Taillight Relay
(Coil Side) 40A MAIN
(Canada) 7.5A OBD
7.5A ALT±S
10A HAZ
10A HORN
15A ECU±B
15A EFI
20A DOMEHeadlight Relay
(Coil Side)
60A ABS 15A STOP
40A HEATER
Taillight Relay
(Point Side)
Engine Main
Relay (Point Side)
15A TEL
Daytime Running
Light Relay No. 2
(Coil Side)
Daytime Running
Light Relay No. 2
(Point Side)Starter Relay
(Point Side)
(5S±FE)
30A POWER
40A AM1
Daytime Running
Light Relay (Main)
15A HEAD (UPR±LH)
15A HEAD (UPR±RH)
[LOCATION](1): J/B No. 1 (See page 20)(2): J/B No. 2 (See page 19)
(3): R/B No. 1 (See page 20)(7): R/B No. 7 (See page 19) 2022
25
27

53
Integration Relay 7.5A IGN
Daytime Running
Light Relay (Main)
Ignition SW
(AM1)(USA)
Starter Relay
(Coil Side) 10A MIR HTRABS Actuator
Light Control SW
[Comb. SW]15A HEAD (LH)
10A A/CABS ECU ABS Actuator
and ECU(TMM Made)
ABS Relay
Integration
Relay
Defogger Relay
(Point Side)
Heater Relay
(Point Side)
15A TAIL
Power Main Relay
(Point Side)Clutch Start
SW Light Control SW
[Comb. SW]
* These are the page numbers of the first page on which the related
system is shown.
The part indicated is located somewhere in the system, not
necessarily on the page indicated here.
(Canada)
Dimmer SW
[Comb. SW]
30A RDI FAN
30A CDS FAN15A HEAD (RH)
7.5A DRL
15A HEAD (LWR±LH)
15A HEAD (LWR±RH)
(Canada)
10A STARTER
Starter
(M/T)
(A/T)
Park/Neutral
Position SW
(Neutral Start SW)
Engine Control
Module (Engine and
Electronic Controlled
Transmission ECU)
7.5A TURN
10A GAUGE
15A ECU±IG
15A CIG/RADIO
20A WIPER (TMC Made) ABS Relay
(4): R/B No. 4 (See page 20)(5): R/B No. 5 (See page 19)(6)R/B No. 6 (See Page )
2526 26

54
POWER SOURCE (Current Flow Chart)
40A AM1
15A CIG/RADIO
40A DEFOG
15A ECU±1G
10A GAUGE
7.5A IGN
10A MIR±HTR
30A POWER
7.5A SRS
15A STOP
15A TAIL
7.5A TURN
20A WIPER
30A AM2
7.5A ALT±S
30A CDS FAN
20A DOME
15A ECU±B
15A EFI
10A HAZ
15A HEAD (LWR±LH)
15A HEAD (LWR±RH)
15A HEAD (UPR±LH)
15A HEAD (UPR±RH)
15A HEAD LH
15A HEAD RH
10A HORN
40A MAIN
7.5A OBD
10A STARTER
10A A/C
40A HEATER
7.5A DRL
100A ALT
60A ABS
A/C Condenser Fan Motor (5S±FE)
242
A4 A5 A11 A1*Page Nos. of
Related Systems
Parts
Code or
Location
CB or Fuse
LocationA2 A3
* These are the page numbers of the first page on which the related system is shown.
The part indicated is located somewhere in the system, not necessarily on the page indicated here.


A12 A6 A7 A13 A17 A18A14 A16 A21 B1 B2 B3 B4 B5 B6 B7 B9 B10 214 252126
252210 210 246246
252126222
224152 236 166246
252246
252126
246
252160
166 220 220
A/C Triple Pressure SW (A/C Dual
and Single Pressure SW)
A/C Magnetic Clutch and Lock
Sensor
ABS Actuator and ECU
(TMM Made)
ABS Actuator (TMC Made)
ABS Actuator and ECU
(TMM Made)
ABS Relay
A/C Amplifier
A/C SW
ABS ECU (TMC Made)
Air Inlet Control Servo Motor
Air Vent Mode Control Servo Motor
Ashtray Illumination
Auto Antenna Motor and Relay
Back±Up Light SW (M/T)
Brake Fluid Level SW
Back Door Lock Control SW
Blower Motor
Blower Resistor
Blower SW
Buckle SW LH
Back Door Lock Motor (W/G)
Buckle SW RH
A10246
252 210 210 210 214 246
252 242
246
252
ABS ECU (TMC Made)A/C Evaporator Temp. Sensor ABS Relay
[LOCATION](1)
(7): J/B No. 1 (See page 20)
: R/B No. 7 (See page )(2)
(8): J/B No. 2 (See page 19)
: Fuse Box (F10, F17 See
on page )(3): R/B No. 1 (See page 23)
2022
25
27
28 29

55
192 17711 4
11 8
Cruise Control Actuator
C2 C5 C10 C11 C13 D8C12 C3 C4 C6 C8 C9 C14 C16 D1 D3 D4 D6 D7
Center Airbag Sensor Assembly
Cigarette Lighter
Cigarette Lighter Illumination
Clock
Combination Meter
(Turn Signal Indicator Light)Combination Meter
(Cruise Control Indicator Light)
Combination Meter
Combination Meter
(Meter Illmination)
Combination Meter
(Open Door Warning Light)
Combination Meter
(Seat Belt Warning Light)
Combination Meter
(Charge Warning Light)
Combination Meter
(High Beam Indicator Light)
Combination Meter
(Rear Light Warning Light)
Combination Meter
Combination Meter
(SRS Warning Light)
Combination Meter
(A/T Indicator Light)
Combination SW (Horn SW)
Combination SW
(Turn Signal SW)
Combination SW
(Light Control SW)
Combination SW
Front Wiper and Washer SW)
Cooling Fan ECU (1MZ±FE)
Cruise Control ECU
Data Link Connector 1
(Check Connector)
Data Link Connector 2
(TDCL (Toyota Diagnostic
Communication Link))
Daytime Running Light Relay
(Main) (CANADA)
Diode (for Idle±Up)
Diode (for Courtesy) (W/G) Door Lock Control Relay
18912618968
72192236210
21476 130
134
138
140 126120
124
144
148236126
198
204104
11 2
144244 80
90
98
214 90
192
214106
23680
90
98130
134
138
140156
140 104
106
D9 C717080
90
98177 17311 4
11 8106
126
148184
186192 98
204134
140
Diode (for Courtesy) Combination Meter
(Malfunction Indicator Light) Combination Meter
(ABS Warning Light) Clutch Start SW (M/T)
(4): R/B No. 4 (See page 20)(5): R/B No. 5 (See page 19)(6)R/B No. 6 (See Page )
2526 26

56
POWER SOURCE (Current Flow Chart)
*Page Nos. of
Related Systems
Parts
Code or
Location
CB or Fuse
Location
* These are the page numbers of the first page on which the related system is shown.
The part indicated is located somewhere in the system, not necessarily on the page indicated here.


D25 E9E8 130
134
138
140130
138160 80 220126
198
20480
Door Courtesy SW Front LH
Door Key Cylinder Light and SW
Engine Control Module (Engine
and Electronic Controlled
Transmission ECU) (A/T) (1MZ±FE)
40A AM1
15A CIG/RADIO
40A DEFOG
15A ECU±1G
10A GAUGE
7.5A IGN
10A MIR±HTR
30A POWER
7.5A SRS
15A STOP
15A TAIL
7.5A TURN
20A WIPER
30A AM2
7.5A ALT±S
30A CDS FAN
20A DOME
15A ECU±B
15A EFI
10A HAZ
15A HEAD (LWR±LH)
15A HEAD (LWR±RH)
15A HEAD (UPR±LH)
15A HEAD (UPR±RH)
15A HEAD LH
15A HEAD RH
10A HORN
40A MAIN
7.5A OBD
10A STARTER
10A A/C
40A HEATER
7.5A DRL
100A ALT
60A ABSE7 E6 E5 E3 E2
D24 D23 D22 D21 D20 D19 D18
D17 D16 D15 D14 D13 D12130
138
140130
134
138
140130
134
138
140160 160 160 160 160 160198
220220 242 80
90
98
19880
Engine Control Module (Engine
and Electronic Controlled
Transmission ECU) (A/T) (5S±FE) Engine Control Module (Engine
and Electronic Controlled
Transmission ECU) Engine Controlled
Transmission Pattern
Select SW Engine Coolant Temp. Sensor
(Water Temp. Sensor) (for
Cooling Fan) (1MZ±FE) Electronic Controlled Transmission
Solenoid (5S±FE) Electronic Controlled Transmission
Solenoid Diode (for Tension Reducer) (C/P) Date Ling Connector 3 Door Lock Motor Rear RH
(EX. C/P) Door Lock Motor Rear LH
(EX. C/P) Door Courtesy SW Front RH
Door Courtesy SW Rear LH
Door Courtesy SW Rear RH
Door Key Lck and Unlock SW LH
(Ex. C/P)
Door Key Lck and Unlock SW RH
(Ex. C/P)
Door Lock Control SW RH
Door Lock Motor and Door Unlock
Detection SW Front LH
Door Lock Motor and Door Unlock
Detection SW Front RH
[LOCATION](1)
(7): J/B No. 1 (See page 20)
: R/B No. 7 (See page )(2)
(8): J/B No. 2 (See page 19)
: Fuse Box (F10, F17 See
on page )(3): R/B No. 1 (See page 23)
2022
25
27
28 29

57
E10 80
98
204 80
90
98
236 184
F376 144
148126
246252
Engine Control Module (Engine
and Electronic Controlled
Transmission ECU)
High Mount Stop Light
Heated Oxygen Sensor (Bank 2
Sensor 1) (1MZ±FE)
Idle Air Control Valve (ISC Valve)
Igniter
Ignition Coil
Injector No. 1
F4 F5 F6 F7 F8 F9 F15 G2 G3 G4 H1 H2 H3 H4 H5 H6 H7 H8 H9 H10 H11 H12 I1 I2 I3 I4 90
198144
148144
148144
14811 4
11 811 4
11 8126 126 104 106 104 106 104 106 104 106 173 17311 4
11 8
12680120
12480 8080
90
9868
8072
98
23672 80
Heated Oxygen Sensor (Bank 1
Sensor 1) (1MZ±FE) Heated Oxygen Sensor (Bank 1
Sensor 2) Air Vent Mode Control SW (for
Lever Control SW Type) Heater Control SW (for Push
Control SW Type) Hazard SW Horn RH
Horn LH Front Clearance Light LH
Front Clearance Light RH
Front Side Marker LH
Front Side Marker RH
Front turn Signal Light LH
Front turn Signal Light RH
Front Wiper Motor
Fuel Pump and Sender
Generator (Alternator)
Glove Box Light
Glove Box Light SW
Headlight Hi LH (USA)
Headlight Hi LH (CANADA)
Headlight Hi RH (USA)
Headlight Hi RH (CANADA)
Headlight Lo LH (USA)
Headlight Lo LH (CANADA)
Headlight Lo RH (USA)
Headlight Lo RH (CANADA)
(4): R/B No. 4 (See page 20)(5): R/B No. 5 (See page 19)(6)R/B No. 6 (See Page )
2526 26