1994 TOYOTA CAMRY start

68
STARTING AND IGNITION (1MZ±FE)
A
AM1
AM2 104
7
9 ACC
IG1
ST1
IG2
ST2
EF1 3EF1 1 1 2G 1
1
2H 2
IG M
B 1
B1
B±RB±R
B±R B±O B±WB±O
B
BWW
W±RW
B±R B±R
W±B
B
B±W B
W±B W±B
B±W
IGNITION SW
52 31
B±W 100A ALT
FUSE BOX
30A
AM210A
STARTER
STARTER
RELAY
PARK/NEUTRAL POSITION SW
(
NE UTRA L START SW)
STARTER BATTERY FL MAIN
2. 0L
S3 , S4 I12
P1
AP
N5
6
B
A 1
B 1
B F10 , F16A
E10 17 2C52F12C2
TO CIRCUIT OPENING
RELAY TO ENGINE CO NTROL
MODULE(
ENGINE AND
ELECTRONIC CONTROLLED
TRANSMISSION ECU)B±W
B±W
5
4 40A
MAIN
IP1
B±W
1E 51G 6
1C 113C 6
1M 13C 18
3C 2
3D 2 3B 20
1G 9
1E 140A
AM1 2
1

70
STARTING AND IGNITION (1MZ±FE)
I12 IGNITION SW
4±7 : CLOSED WITH IGNITION SW AT ST POSITION
10±9 : CLOSED WITH IGNITION SW AT ON OR ST POSITION
STARTER RELAY
(6) 2± (6) 4 : CLOSED WITH CLUTCH START SW ON AND IGNITION SW AT ST POSITION (M/T)
CLOSED WITH IGNITION SW AT ST POSITION (A/T)
STARTER
POINTS CLOSED WITH CLUTCH START SW ON AND IGNITION SW AT ST POSITION
P 1 PARK/NEUTRAL POSITION SW (NEUTRAL START SW) (A/T)
2±3 : CLOSED WITH A/T SHIFT LEVER IN P OR N POSITION
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
D 128I15B29I2129
E 732I1629J 733
F10A28I1729P 129
F16B28I1829S 3A29
I 2A29I1929S 4B29
I1233I2029
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
125R/B NO. 1 (LEFT KICK PANEL)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1C
1E20COWL WIRE AND J/B NO 1 (INSTRUMENT PANEL LEFT)1G20COWL WIRE AND J/B NO. 1 (INSTRUMENT PANEL LEFT)
1M
2C22ENGINE WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
2G22COWL WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
2H22ENGINE WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
2F22COWL WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
3C24COWL WIRE AND J/B NO. 3 (BEHIND COMBINATION METER)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
EF138 (1MZ±FE)EF140 (5S±FE)ENGINE WIRE AND COWL WIRE
IP144
ENGINE WIRE AND COWL WIRE
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
EC38 (1MZ±FE)INTAKE MANIFOLD RHEC40 (5S±FE)INTAKE MANIFOLD RH
ED38 (1MZ±FE)INTAKE MANIFOLD LHED40 (5S±FE)INTAKE MANIFOLD LH
IG42INSTRUMENT PANEL BRACE LH
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
E1038 (1MZ FE)ENGINE WIREE1338 (1MZ FE)ENGINE WIREE1238 (1MZ±FE)ENGINE WIREE1438 (1MZ±FE)ENGINE WIRE
SERVICE HINTS

72
STARTING AND IGNITION (5S±FE)
4
107
9 AM2 AM1ACC
IG1
ST1
IG2
ST2
30A
AM210A
STARTER 40A
MAIN
A 1
B 12C 52F12C2 1
1 2H 22G 1
B1A 1
IG EF1 1EF1 1
M 52 31
2 1
E20 EF1 3B±O
B±W
B±O
B±R
BB±W
W±RW
B±WB W
B±W B±W
B W±BB±R
B
B
B±W B±W
B± R(
M/T)
(
M/T)
(
A/T)
(
A/T)
(
M/T)
(
A/T) W±B
4 5
P
N
65
W
B B
W±BB±R
W±B
B±R
PARK/NEUTRAL POSITION SW
(
NE UTRA L START SW)
(
A/T) P1CLUTCH START
SW(
M/T) C7
STARTER
RELAY IGNITION SW I12
FL MAIN
2. 0L
BATTERY
TO CIRCUIT OPENING
RELAY TO ENGINE CONTROL
MODULE(
ENGINE AND
ELE CTRONIC CO NTROLLED
TRANSMISSION
ECU(
A/T)
,
ENGINE ECU(
M/T))
B S3 ,S4A
B F10 , F16A
STARTER
FUSE BOX100A ALT
IP 1 17
1G 6
1E 5
140A
AM1
1E 11G 9
2
3B 20 3D23C 2
3C 18
1M 13C 6
1C 11

74
STARTING AND IGNITION (5S±FE)
I12 IGNITION SW
4±7 : CLOSED WITH IGNITION SW AT ST POSITION
10±9 : CLOSED WITH IGNITION SW AT ON OR ST POSITION
C 7 CLUTCH START SW (M/T)
1±2 : CLOSED WITH CLUTCH PEDAL FULLY DEPRESSED
STARTER RELAY
(6) 2± (6) 4 : CLOSED WITH CLUTCH START SW ON AND IGNITION SW AT ST POSITION (M/T)
CLOSED WITH IGNITION SW AT ST POSITION (A/T)
STARTER
POINTS CLOSED WITH CLUTCH START SW ON AND IGNITION SW AT ST POSITION
P 1 PARK/NEUTRAL POSITION SW (NEUTRAL START SW) (A/T)
2±3 : CLOSED WITH A/T SHIFT LEVER IN P OR N POSITION
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
C 732E11B32I1233
D 130F10A30P 131
D2A30F16B30S 3A31D 2B30I 231S 4B31
E 7A32I 331
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
125R/B NO. 1 (LEFT KICK PANEL)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1A
1C
1E20COWL WIRE AND J/B NO. 1 (INSTRUMENT PANEL LEFT)
1G
20COWL WIRE AND J/B NO. 1 (INSTRUMENT PANEL LEFT)
1M
2C22ENGINE WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
2F22COWL WIRE AND J/B NO 2 (ENGINE COMPARTMENT LEFT)2G22COWL WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
2H22ENGINE WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
3B
3C24COWL WIRE AND J/B NO. 3 (BEHIND COMBINATION METER)
3D
24COWL WIRE AND J/B NO. 3 (BEHIND COMBINATION METER)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
EF138 (1MZ±FE)EF140 (5S±FE)ENGINE WIRE AND COWL WIRE
IP144
ENGINE WIRE AND COWL WIRE
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
EC38 (1MZ±FE)INTAKE MANIFOLD RHEC40 (5S±FE)INTAKE MANIFOLD RH
IG42INSTRUMENT PANEL BRACE LH
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
E1640 (5S FE)ENGINE WIREE2040 (5S±FE)ENGINE WIRE
E1940 (5S±FE)ENGINE WIRE
SERVICE HINTS

76
CHARGING
A
IG L S B
IC RE GULATOR2C 6
B 2B1B3 8
E9
E
IP3 10 IP 3 2GE 64)
A 1 7. 5A
ALT±S
R±LY
W
R±L
YB±O
W B
W
W
GENERATOR
(
ALTERNATOR)
BATTERY FL MAIN
2. 0L
100A ALT
CHARGE WARNING LIGHT
[COMB. METER]
JUNCTION
CONNECTOR
Y
J1
G1 , G2
C9
B FUSE BOX
FROM DAYTIME RUNNING
LIGHT RELAY(
MAIN)
Y E
(
CANADA)
R±L R±L
TO BA CK± UP SW(
M/T)
TO PARK/NEUTRAL POSITION
SW(
NEUTRAL START SW)(
A/T)
TO VEHICLE SPEED SENSOR
(
SPEED SENSOR) B 1A 1
C 1(
1MZ±FE)
(
5S±FE)
B F10 , F10AC,F16
I18
1D 61D37. 5A
IGN 10A
GAUGE
FROM POWER SOURCE SYSTEM(
SEE PA

78
ENGINE CONTROL (1MZ±FE)
THIS SYSTEM UTILIZES AN ENGINE CONTROL MODULE (ENGINE AND ELECTRONIC CONTROLLED TRANSMISSION ECU) 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. (WATER TEMP.) SIGNAL CIRCUIT
THE ENGINE COOLANT TEMP. SENSOR (WATER TEMP. SENSOR) DETECTS THE ENGINE COOLANT TEMP. AND HAS A
BUILT±IN THERMISTOR WITH A RESISTANCE WHICH VARIES ACCORDING TO THE WATER TEMP. IS INPUT INTO TERMINAL
THW OF ENGINE CONTROL MODULE (ECU) AS A CONTROL SIGNAL.
(2) INTAKE AIR TEMP. SIGNAL CIRCUIT
THE INTAKE AIR TEMP. SENSOR IS INSTALLED IN THE MASS AIR FLOW (AIR FLOW METER) AND DETECTS THE INTAKE AIR
TEMP., WHICH IS INPUT AS A CONTROL SIGNAL TO TERMINAL THA OF ENGINE CONTROL MODULE (ECU).
(3) OXYGEN SENSOR SIGNAL SYSTEM
THE OXYGEN DENSITY IN THE EXHAUST GASES IS DETECTED AND INPUT AS A CONTROL SIGNAL TO TERMINAL OXL, OXR
AND OXS OF THE ENGINE CONTROL MODULE (ECU). TO MAINTAIN STABLE DETECTION PERFORMANCE BY THE OXYGEN
SENSOR, A HEATER IS USED FOR WARMING THE SENSOR. THE HEATER IS ALSO CONTROLLED BY THE ENGINE CONTROL
MODULE (ECU) (HTL, HTR AND HTS).
(4) RPM SIGNAL SYSTEM
CAMSHAFT POSITION AND CRANKSHAFT POSITION ARE DETECTED BY THE CAMSHAFT POSITION SENSOR AND
CRANKSHAFT POSITION SENSOR. CRANKSHAFT POSITION IS INPUT AS A CONTROL SIGNAL TO TERMINAL G22+ OF THE
ENGINE CONTROL MODULE (ECU), AND ENGINE RPM IS INPUT TO TERMINAL NE+.
(5) THROTTLE SIGNAL CIRCUIT
THE THROTTLE POSITION SENSOR DETECTS THE THROTTLE VALVE OPENING ANGLE AS A CONTROL SIGNAL, WHICH IS
INPUT INTO TERMINAL VTA OF THE ENGINE CONTROL MODULE (ECU). WHEN THE VALVE IS COMPLETELY CLOSED, THE
CONTROL SIGNAL IS INPUT INTO TERMINAL IDL.
(6) VEHICLE SPEED SIGNAL SYSTEM
THE VEHICLE SPEED SENSOR (SPEED SENSOR), INSTALLED INSIDE THE COMBINATION METER, DETECTS THE VEHICLE
SPEED AND INPUTS A CONTROL SIGNAL TO TERMINAL SP1 OF THE ENGINE CONTROL MODULE (ECU).
(7) PARK/NEUTRAL POSITION SW (NEUTRAL START SW) SIGNAL SYSTEM
THE PARK/NEUTRAL POSITION SW (NEUTRAL START SW) DETECTS WHETHER THE SHIFT POSITION IS IN NEUTRAL OR
PARKING OR NOT, AND INPUTS A CONTROL SIGNAL TO TERMINAL NSW OF THE ENGINE CONTROL MODULE (ECU).
(8) A/C SW SIGNAL SYSTEM
THE A/C AMPLIFIER INPUTS THE A/C OPERATIONS TO TEMRINAL A/C OF THE ENGINE CONTROL MODULE (ECU) AS A
CONTROL SIGNAL.
(9) BATTERY SIGNAL CIRCUIT
VOLTAGE IS CONSTANTLY APPLIED TO TERMINAL BATT OF THE ENGINE CONTROL MODULE (ECU). WHEN THE IGNITION SW
TURNED ON, VOLTAGE FOR ENGINE CONTROL MODULE (ECU) START±UP POWER SUPPLY IS APPLIED TO TERMINALS +B
AND +B1 OF ENGINE CONTROL MODULE (ECU) VIA EFI MAIN RELAY.
(10) INTAKE AIR VOLUME SIGNAL CIRCUIT
INTAKE AIR VOLUME IS DETECTED BY THE MASS AIR FLOW (AIR FLOW METER) AND THE SIGNAL IS INPUT TO TERMINAL VG
OF THE ENGINE CONTROL MODULE (ECU). AS A CONTROL SIGNAL.
(11) STA 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 STA OF THE ENGINE CONTROL MODULE (ECU) AS A CONTROL
SIGNAL.
(12) ENGINE KNOCK SIGNAL CIRCUIT
ENGINE KNOCKING IS DETECTED BY THE KNOCK SENSOR NO. 1 AND NO. 2 AND THE SIGNALS ARE INPUT INTO TERMINALS
KNKR AND KNKL AS A CONTROL SIGNAL.
SYSTEM OUTLINE

80
ENGINE CONTROL (1MZ±FE)
AM1
AM2 104
7
9 ST1
IG2
2G 1
IG 1 2
1 2
1 2
1 2
1 2
1 2 I20
E12 I18 E12 I18
BX1 4IJ1 16 EF1 3IP1 9IP1 16
IP3 15 66
666 641 32 2H 2
L±B
G±R
Y
R
L
GR
G
W B±OL±B B±W
B±WB±O
B±O B±O B±O
BB±O
BWW
BW
W±R
B±O
B±O B±O B±O
B±O
B±O
B±O
B±O
B±O Y RL GRG W
W±B W±B W±B
L±B L±BG±R
L±BB± O
B±W
B±W
BATTERY FL MAIN
2. 0LI18
B±O B±O 100A ALT
10A
STARTER
30A
AM2
FUSE BOX
IGNITION SW
CIRCUIT
OPENING
RELAY
INJECTOR NO. 1
INJECTOR NO. 6
INJECTOR NO. 3
INJECTOR NO. 4
INJECTOR NO. 5
INJECTOR NO. 2 I4
I9
I6
I7
I8
I5
I12
L±B
A 1
B 1B F10 , F16A
FROM POWER SOURCE
SYSTEM(
SEE PAGE 64)
1 B±O
B±W B±W
B±O
IP14
B±O 4
1G 9
1E 140A
AM1 2
1
1G 8
1A 67. 5A
IGN 1D 9
3B 20
3D 23C 2
3A 13
1C 113C 18
1M 1

84
ENGINE CONTROL (1MZ±FE)
CIRCUIT OPENING RELAY2±1 : CLOSED WITH STARTER RUNNING OR MEASURING PLATE (VOLUME AIR FLOW (AIR FLOW METER)) OPEN
EFI MAIN RELAY2±4 : CLOSED WITH IGNITION SW AT ON OR ST POSITION
E 4
ENGINE COOLANT TEMP. SENSOR (EFI WATER TEMP. SENSOR) 1±2 : 10.0 ± 20.0 K (±20°C, ±4°F)
: 4.0 ± 7.0 K (0°C, 32°F)
: 2.0 ± 3.0 K (20°C, 68°F)
: 0.9 ± 1.3 K (40°C, 104°F)
: 0.4 ± 0.7 K (60°C, 140°F)
: 0.2 ± 0.4 K (80°C, 176°F)
E 7(A), E 8(B), E 9(C), E10(D)
ENGINE CONTROL MODULE (ENGINE AND ELECTRONIC CONTROLLED
TRANSMISSION ECU)
VOLTAGE AT ENGINE CONTROL MODULE (ECU) WIRING CONNECTOR
BATT ± E1: ALWAYS 9.0±14.0 VOLTS
+B ± E1:9.0±14.0 VOLTS (IGNITION SW AT ON POSITION)
+B1 ± E1:9.0±14.0 VOLTS (IGNITION SW AT ON POSITION)
IDL ± E1:9.0±14.0 VOLTS (IGNITION SW ON AND THROTTLE VALVE FULLY OPEN)
0±3.0 VOLTS (IGNITION SW ON AND THROTTLE VALVE FULLY CLOSED)
VC ± E1: ALWAYS 4.5±5.5 VOLTS (IGNITION SW AT ON POSITION)
VTA ± E1:0.3±0.8 VOLTS (IGNITION SW ON AND THROTTLE VALVE FULLY CLOSED)
3.2±4.9 VOLTS (IGNITION SW ON AND THROTTLE VALVE FULLY OPEN)
VG ± E1:4.0±5.5 VOLTS (IGNITION SW AT ON POSITION)
THA ± E1:0.5±3.4 VOLTS (IGNITION SW ON AND INTAKE AIR TEMP. 20°C, 68°F)
THW ± E1:0.2±1.0 VOLTS (ENGINE IDLING AND COOLANT TEMP. 80°C, 176°F)
#10, #20, #30, #40, #50, #60
± E01:9.0±14.0 VOLTS (IGNITION SW AT ON POSITION)
PULSE GENERATION (ENGINE IDLING)
IGT1, IGT2, IGT3
IGT4, IGT5, IGT6 ± E1: PULSE GENERATION (ENGINE IDLING)
IGF ± E1:4.5±5.5 VOLTS (IGNITION SW AT ON POSITION)
PULSE GENERATION (ENGINE IDLING)
G22+ ± G±: PULSE GENERATION (ENGINE IDLING)
NE+ ± G±: PULSE GENERATION (ENGINE IDLING)
RSC, RSO ± E1: PULSE GENERATION (ENGINE IDLING AND A/C OPERATION)
OXS, OXL, OXR ± E1: PULSE GENERATION (MAINTAIN ENGINE SPEED AT 2500 RPM FOR TWO MINUTES AFTER WARMING UP)
HTS, HTL, HTR ± E01:9.0±14.0 VOLTS (IGNITION SW AT ON POSITION)
0±3.0 VOLTS (ENGINE IDLING)
KNKL, KNLR ± E1: PULSE GENERATION (ENGINE IDLING)
NSW ± E1:9.0±14.0 VOLTS (IGNITION SW ON AND OTHER SHIFT POSITION IN P OR N POSITION)
BELOW 3.0 VOLTS (IGNITION SW ON AND SHIFT POSITION IN P OR N POSITION)
SP1 ± E1: PULSE GENERATION (IGNITION SW ON AND ROTATE DRIVING WHEEL SLOWLY)
TE1 ± E1:9.0±14.0 VOLTS (IGNITION SW AT ON POSITION)
TE2 ± E1:9.0±14.0 VOLTS (IGNITION SW AT ON POSITION)
W ± E1: BELOW 3.0 VOLTS (MULFUNCTION INDICATOR LAMP ON)
9.0±14.0 VOLTS (MULFUNCTION INDICATOR LAMP OFF AND ENGINE RUNNING)
A/C ± E1: BELOW 1.5 VOLTS (ENGINE IDLING AND A/C SW ON)
7.5±14.0 VOLTS (A/C SW OFF)
ACT ± E1:9.0±14.0 VOLTS (ENGINE IDLING AND A/C SW ON)
BELOW 1.5 VOLTS (A/C SW OFF)
ACIS ± E01:9.0±14.0 VOLTS (IGNITION SW AT ON POSITION)
STA ± E1:6.0 VOLTS OR MORE (ENGINE CRANKING)
I 4, I 5, I 6, I 7, I 8, I 9
INJECTOR1±2 : APPROX. 13.8 
T 1
THROTTLE POSITION SENSOR3±1 :0.2±5.7 KWITH CLEARANCE BETWEEN LEVER AND STOP SCREW 0 MM (0 IN.)
2±1 : LESS THAN 2.3 KWITH CLEARANCE BETWEEN LEVER AND STOP SCREW 0.5 MM (0.020 IN.)
WITH CLEARANCE BETWEEN LEVER AND STOP SCREW 0.7 MM (0.0276 IN.)
3±1 :2.0±10.2 KWITH THROTTLE VALVE FULLY OPEN
SERVICE HINTS