2000 TOYOTA CAMRY ECU

To Ignition SW
IG Terminal
Test Light
Relay Light
SW 2 SolenoidDisconnectShort [A]
Disconnect
DisconnectSW 1Fuse Case
Short [B]
Short [C]
Pull Up
Press Down Press DownPull Up
C
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:
[A] ± Ignition SW on
[B] ± Ignition SW and SW 1 on
[C] ± 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 internal 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 : C h e c k t o s e e w h a t k i n d o f connector you are
disconnecting before pulling apart.

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

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)

G ELECTRICAL WIRING ROUTING
Position of Parts in Engine Compartment
[5S±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 9 ABS Speed Sensor Front LH
A 10 ABS Speed Sensor Front RH
A 11 Air Fuel Ratio 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 ResistorE 3 Electronically Controlled Transmission Solenoid
E 4 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 5 Horn (High)
H 6 Horn (Low)

G ELECTRICAL WIRING ROUTING
Position of Parts in Instrument Panel
A 12 A/C Amplifier
A 13 A/C Evaporator Temp. Sensor
A 14 A/C SW
A 15 ABS and Traction ECU
A 16 ABS and Traction ECU
A 17 ABS and Traction ECU
A 18 ABS ECU
A 19 ABS ECU
A 20 Air Vent Mode Control Servo Motor
A 22 Airbag Squib (Front Passenger Airbag Assembly)
A 23 Airbag Squib (Steering Wheel Pad)
A 24 Ashtray Illumination
A 33 A/C Blower Motor Linear Controller
A 34 A/C Control Assembly
A 35 A/C Control Assembly
A 36 A/C Room Temp. Sensor
A 37 A/C Solar Sensor
A 38 Air Inlet Control Servo Motor
A 39 Air Mix Control Servo Motor
A 40 Automatic Light Control Sensor
B 3 Blower Motor
B 4 Blower Resistor
B 5 Blower SW
B 8 Blower Resistor (Low Speed)
C 4 Cigarette Lighter
C 5 Cigarette Lighter Illumination
C 6 Clock
C 7 Clutch Start SW
C 8 Combination Meter
C 9 Combination Meter
C 10 Combination MeterC 11 Combination SW
C 12 Combination SW
C 13 Combination SW
C 14 Cruise Control Clutch SW
C 15 Cruise Control ECU
C 17 Center Airbag Sensor Assembly
C 18 Center Airbag Sensor Assembly
C 19 Center Airbag Sensor Assembly
D 4 Data Link Connector 2
D 5 Data Link Connector 3
D 6 Daytime Running Light Relay (Main)
D 7 Diode (Courtesy)
D 10 Diode (Dome)
D 11 Diode (Idle±Up)
E 7 Engine Control Module
E 8 Engine Control Module
E 9 Engine Control Module
E 10 Engine Control Module
E 11 Engine Control Module
G 3 Glove Box Light and SW
H 7 Hazard SW
H 8 Heated Oxygen Sensor (Bank 1 Sensor 2)
H 9 Heater Control SW
I 15 Ignition Key Cylinder Light
I 16 Ignition SW
I 17 Integration Relay
I 18 Integration Relay

G
Position of Parts in Instrument Panel
J 1 Junction Connector
J 2 Junction Connector
J 3 Junction Connector
J 4 Junction Connector
J 5 Junction Connector
J 6 Junction Connector
J 7 Junction Connector
J 8 Junction Connector
J 9 Junction Connector
J 10 Junction Connector
J 11 Junction Connector
J 12 Junction Connector
J 13 Junction Connector
J 14 Junction Connector
J 15 Junction Connector
J 16 Junction Connector
J 17 Junction Connector
J 18 Junction Connector
J 19 Junction Connector
J 20 Junction Connector
J 21 Junction Connector
J 22 Junction Connector
J 23 Junction Connector
J 24 Junction Connector
J 25 Junction Connector
J 26 Junction Connector
J 27 Junction Connector
J 28 Junction Connector
J 29 Junction Connector
J 30 Junction Connector
J 31 Junction Connector
J 32 Junction Connector
J 33 Junction ConnectorJ 34 Junction Connector
J 35 Junction Connector
J 36 Junction Connector
J 37 Junction Connector
K 3 Key Interlock Solenoid
O 2 O/D Main SW and A/T Shift Lever Illumination
P 3 Parking Brake SW
P 4 Power Outlet
R 2 Radio and Player
R 3 Radio and Player
R 4 Radio and Player
R 5 Rear Window Defogger SW
R 6 Remote Control Mirror SW
R 7 Rheostat
S 3 Shift Lock ECU
S 4 Stereo Component Amplifier
S 5 Stereo Component Amplifier
S 6 Stop Light SW
T 3 Theft Deterrent ECU
T 4 Theft Deterrent ECU
T 5 Traction Off SW
T 6 Turn Signal Flasher
T 7 Transponder Key Amplifier
U 1 Unlock Warning SW
W 6 Wireless Door Lock ECU

POWER SOURCE
1260A FL ABS
1260A FL ABS 3
3
1
1
2B2
2A1
2B33
3
3
1240A MAIN
EB B 1F1F2E1
A 1C1D1 E 33
1
1
1
2L4
2G3
2G4 2C5
2K63
3
3
3
3 16
5
1
1
4
4
1
3
4
1
3
1
44
3
2
3
2
5
2
5
2
3 2 B
B
BB±R L±WL±B L±R
L±B W±B B±G
B±G L
GR±LR±LGR GR±R
W± L
W±B
W± R
B±R
W±B
W±R
R
R±L
B±GB±G
B±G
B±G
B±R B±R
B±R
L±B
W±B
W±B
W±B R±B
BATTERY
FL MAIN 3. 0W
100A
ALT50A
HTR GENERATOR G 1
ABS SOL RELAY
AB S MOTOR RELAY
HTR RELAY
ENGINE MAIN RELAY
15A EFI
10A HAZARD
20A RADIO NO. 1
10A HORN
30A AM2
SHORT PIN
5A ALT±S
HEAD RELAY
15A HEAD (
RH)(
*9)
15A HEAD RH(
UPR)(
*8)
15A HEAD (
LH)(
*9)
15A HEAD LH(
UPR)(
*8)
(
5S±FE W/O ABS)
(
*7, *2 *4)
(
*2 *5)
(
*7, *2 *4)
(
*2 *5)
GR±R
30A CDS30A RDI
1 1
2 2
10A ECU±B
7. 5A DOME
(
*8)
(
*8)
(
*9)
112
1
10A A/C
2F4
W±B
B±R
12
3
25
1
ST RELAYL±R 5
13
22
2 2
2B
(
*6)
W±B
(
*6) B±W
(
*6) L
(
*6)
A/F HTR RELAY
1 1
W
(
*6) FL 1. 25B25A A/F HTR
F 4 BA, F 5
F 7
FUSIBLE LINK BLOCKE D, F 8C , F 6
F , F 9L
(
*6)
,
1 2(
*3)(
*3)

1230A POWER
1240A DEF
12
40A AM1 1B4
1B1
1K2
1K6
1K1
1K3
1K4
1K5
1B5
2
221J7
2
2
2
22
2 AM1
AM2 7 23
6 ACC
IG1
IG2
ST24
8I 1
12
IG 12
13 25A DOOR
15A STOP
7. 5A OBDTAI LL IGHT REL AY10A TAIL
7. 5A PANEL
POWER RELAY
NOISE FILTER
NOISE FILTER
DEFOGGER RELAY
10A MIRROR±HEATER
15A CIG
7. 5A RAD±NO. 2
15A POWER±OUTLET
15A ECU±IG
10A HEATER
10A GAUGE
25A WIPER
7. 5A TURN
5A IGN
5A STARTER
5A DRL NO. 2
DIM
RELAY10A H±LP RH (
LWR)
10A H±LP LH (
LWR)
JUNCTION
CONNECTOR IGNITION SW I16
J11 B±R
B±R
W B±R
W± B
L±R
B±Y
B±R
R1
1 5
1
5
1
5
13
2
3
2
2
2
3
2
* 1 : TMC MADE
* 2 : TMMK MADE
* 3 : EXCEPT TAIWAN* 4 : W/ TRACTION CONTROL
* 5 : W/ O TRACTI ON CONTROL W±R
R
R±L W±R
(
*8)
(
*8)14
2
3W±R
R±B
R±L(
*8)
R±YR±G
R
A
W±B
1A6
B±R
R
* 6 : CALIFORNIA* 7 : TMC MADE EXCEPT 5S±FE W/O ABS
* 8 : W/ DAYTIME RUNNING LIGHT
* 9 : W/O DAYTIME RUNNING LIGHT