2000 TOYOTA CAMRY heater

NEW FEATURES Ð 5S-FNE ENGINE
NEW FEATURES
6
5S-FNE ENGINE
DESCRIPTION
The 5S-FNE engine is a new engine that uses CNG (Compressed Natural Gas) as fuel, which has been
developed based on the 5S-FE gasoline engine.
The main component of natural gas is methane (CH
4), which has fewer carbons (C) than gasoline (mean
molecular formula: C
7.5H13.4). Therefore, the amount of CO2 discharged by this engine is approximately
70% that of the gasoline engine. Furthermore, this engine achieves low-emission operation by precisely
controlled air-fuel ratio and using special catalysts for the CNG application.
However, because the fuel is in the gaseous form, its volumetric efficiency is low, causing lower power
output if this fuel is used in the base engine.
Therefore, the 5S-FNE engine has adopted the following features: a high compression ratio, the intake
valves with early closed timing, the intake and exhaust valves with increased lift, a low back pressure muffler
made possible by the 2-way exhaust system, injectors for gaseous fuel, and a catalytic converter designed
exclusively for CNG application. At the same time, precision air-fuel ratio control is effected through the
use of the air-fuel ratio sensor* and the heater oxygen sensor, thus achieving the level of performance that
is equivalent to the base engine. Moreover, this engine realizes extremely low emissions and restoring engine
torque.
*: Already adopted on the California specification 5S-FE engine.

Specifications 
Item
5S-FNE Engine5S-FE Engine
No. of Cyls. & Arrangement4-Cylinder, In-Line
Valve Mechanism16-Valve DOHC,
Belt & Gear Drive
Combustion CamberPentroof Type
ManifoldsCross-Flow
Fuel SystemSFI
Displacement cm3 (cu. in.)2164 (132.0)
Bore
Stroke mm (in.)87.0
91.0 (3.43
3.58)
Compression Ratio11.0 : 19.5 : 1
Max. Output [SAE-NET]88 kW @ 5200 rpm
(118 HP @ 5200 rpm)
99 kW @ 5200 rpm
(133 HP @ 5200 rpm)
97 kW @ 5200 rpm*
(130 HP @ 5200 rpm)*
Max. Torque [SAE-NET]178 N´m @ 2400 rpm
(131 ft´lbf @ 2400 rpm)
199 N´m @ 4400 rpm
(147 ft´lbf @ 4400 rpm)
197 N´m @ 4400 rpm*
(145 ft´lbf @ 4400 rpm)*
IntakeOpen35 BTDC
Valve
IntakeClose385 ABDC435 ABDCValve
Timing
ExhaustOpen455 BBDCExhaustClose35 AT D C
Fuel Octane Number RON13091
Oil GradeAPI SJ EC or ILSAC
*: California Specification Models

NF
NEW FEATURES Ð 5S-FNE ENGINE19
ENGINE CONTROL SYSTEM
1. General
An engine control system based on the 5S-FE engine has been adopted. The knock sensor has been discontin-
ued because natural gas has a high octane value and is less susceptible to knocking.
The engine control system of 5S-FNE and 5S-FE engines are compared below.
System
Outline5S-FNE5S-FE
SFI
Sequential
A D-type SFI system is used, which indirectly detects
intake air volume by manifold absolute pressure sensor.
Sequential
Multiport Fuel
Injection
The fuel injection system is a sequential multiport fuel
injection system.
Ignition timing is determined by the ECM based on sig-
nals from various sensors.
ESA
Electronic Spark
AdvanceThe ECM corrects the ignition timing in response to en-
gine knocking in accordance with the signals received
from the knock sensor.
Ð
Advance
Torque control correction during gear shifting had been
used to minimize the shift shock.*1
IAC
(Idle Air Control)A rotary solenoid type IAC valve controls the fast idle
and idle speeds.
(1-Coil Type
Built-in Driver)(2-Coil Type)
Fuel Pump ControlFuel pump operation is controlled by signal from the
ECM.Ð
Fuel Cut-Off
Control
The fuel shutoff valves for the fuel tank, fuel pressure
regulator, and delivery pipe are shut off to stop the sup-
ply of fuel when the ignition switch is turned OFF or
during abnormal conditions (such as engine stalling,
SRS airbag deployed, etc.).
Ð
Oxygen Sensor
and Air Fuel Ratio
Sensor
Heater ControlMaintains the temperature of the oxygen sensor and air
fuel ratio sensor at an appropriate level to increase accu-
racy of detection of the oxygen concentration in the ex-
haust gas.
*2
EGR Cut-Off
ControlCuts off EGR according to the engine condition to
maintain drivability of the vehicle and durability of the
EGR components.

Evaporative
Emission ControlThe ECM controls the purge flow of evaporative emis-
sions (HC) in the charcoal canister in accordance with
engine conditions.
Ð
Air Conditioning
Cut-Off ControlBy turning the air conditioning compressor ON or OFF
in accordance with the engine condition, drivability is
maintained.
*3*3
When the ECM detects a malfunction, the ECM diag-
noses and memorized the failed section.
DiagnosisThe diagnosis system includes a function that detects a
malfunction in the evaporative emission control sys-
tem.
Ð
Fail-Safe
When the ECM detects a malfunction, the ECM stops
or controls the engine according to the data already
stored in memory.

*1: Only for Automatic Transaxle Model
*
2: Air fuel ratio sensor only for California specification model.
*
3: The air conditioning magnet clutch controled by the ECM

NEW FEATURES Ð 5S-FNE ENGINE
(Continued)
PIM
NE
G
THW
THA
VTA
AF
#10+
#20
#30
#40
IGT1,
IGT2
IGF
RSD
EGR
OX2
HTAF
HT2
MGC
FUEL W
PSW
ELS
NSW
F/PS
A/C SW
ECM
STA
SPD
R,2,L
STP
#40+ #30+ #20+ #10
FUEL
20
2. Construction
The configuration of the engine control system in the 5S-FNE engine is as shown in the following chart.
SENSORS
MANIFOLD ABSOLUTE
PRESSURE SENSOR
CRANKSHAFT POSITION
SENSOR
CAMSHAFT POSITION
SENSOR
ENGINE COOLANT TEMP.
SENSOR
INTAKE AIR TEMP. SENSOR
THROTTLE POSITION SENSOR
IGNITION SWITCH
COMBINATION METER
wVehicle Speed Signal
AIR FUEL RATIO SENSOR
(Bank 1, Sensor 1)
HEATED OXYGEN SENSOR
(Bank 1, Sensor 2)
POWER STEERING OIL
PRESSER SWITCH
TAILLIGHT & REAR WINDOW
DEFOGGER SYSTEM
PARK/NEUTRAL POSITION
SWITCH
STOP LIGHT SWITCH
AIR CONDITIONING SWITCH
AIRBAG SENSOR ASSEMBLY
wFuel Cut-Off Signal
ACTUATORS
SFI
No. 1 INJECTOR
No. 2 INJECTOR
No. 3 INJECTOR
No. 4 INJECTOR
ESA
IGNITERS and
IGNITION COILS
SPARK PLUGS
IAC
CONTROL VALVE
EGR
VSV
AIR FUEL RATIO SENSOR
HEATER CONTROL
AIR FUEL RATIO SENSOR
HEATER
OXYGEN SENSOR HEATER
CONTROL
HEATED OXYGEN SENSOR
HEATER
AIRE CONDITIONING
CUT-OFF CONTROL
MAGNET CLUTCH RERAY
FUEL GAGE
LOW FUEL LEVEL WARNING
LIGHT

B HOW TO USE THIS MANUAL
The ground points circuit diagram shows the connections from all major parts to the respective ground points. When
troubleshooting a faulty ground point, checking the system circuits which use a common ground may help you identify
the problem ground quickly. The relationship between ground points (
EA, IB and IC shown below) can also be
checked this way.

I GROUND POINT
FAN MAIN RELAY
FAN MAIN RELAY
A/C FAN RELAY NO.2
A/C FAN RELAY NO.3
RADIATOR FAN MOTOR
RETRACT CONTROL
RELAY
RETRACT MOTOR RH
RETRACT MOTOR LH
FRONT TURN SIGNAL
LIGHT RH
PARKING LIGHT RH
FRONT TURN SIGNAL
LIGHT LH
PARKING LIGHT LH
DOOR LOCK CONTROL
SW RH
DOOR KEY LOCK
SW RH
DOOR LOCK MOTOR
RH
BLOWER RESISTOR
A/C AMPLIFIER
RADIO AND PLAYER
HEATER RELAY
AUTO ANTENNA
MOTOR
BLOWER SW
PARKING BRAKE SW
COMBINATION METER
HORN SW [COMB. SW]
TURN SIGNAL FLASHER
DOOR KEY LOCK SW LH
DOOR LOCK MOTOR LH
FUEL CONTROL SW
WOOFER AMPLIFIER
COMBINATION METER
COMBINATION METER
FUEL SENDER
CIGARETTE LIGHTER
O/D MAIN SW
CLOCK
5
5
5
5
4
4
4
4
4BA15
IB18
EA2 10
3E5
3E
6 3G
13 3F
3 3D
1 3B
7
ID115
IC33
IA12
E 3
A
A AW±B
W±BW±B W±B
W±B W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B W±BW±B W±B W±B W±B
W±B W±B
W±BW±B
W±B
W±B
W±B W±B
W±B
BR
W±B
BR BRW±BW±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B W±B
W±B
W±B
W±B
W±B
BR W±B
BR BR
BR W±B W±BW±B
W±BW±BBR W±B (4A±GZE)
W±B A A A
I 6
I 6
I 2
I 2
I 2
B 5I 5
I 5
I 5
B 5
B 5
B 5
I 5
I 5
I 3I 3
E 3
E 3
E 3
E 2
E 4
E 5
E 4
E 5
E 6E 4
E 4
B 4
EAI 4
B 4
B 4
I 4I 8
IBIC
3C7
4
JUNCTION
CONNECTOR J 1
4
DOOR LOCK CONTROL
RELAY
ELECTRICAL IDLE-UP
CUT RELAY (M/T)FRONT SIDE MARKER
LIGHT RH
FRONT SIDE MARKER
LIGHT LH
BRAKE FLUID LEVEL
WARNING SW
UNLOCK WARNING
SW WIPER AND WASHER
SW [COMB. SW] LIGHT CONTROL SW
[COMB. SW] HEATER CONTROL
ASSEMBLY
HEATER SERVO
MOTOR AMPLIFIER
DIMMER SW
[COMB. SW]
CRUISE CONTROL
MIRROR SW
REAR WINDOW
DEFOGGER SW
POWER WINDOW
MASTER SW
POWER WINDOW
CONTROL RELAY
DOOR LOCK CONTROL
SW
REMOTE CONTROL
MIRROR SW
* The system shown here is an EXAMPLE ONLY. It is different to the actual circuit shown in the SYSTEM CIRCUITS SECTION.

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

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

ENGINE CONTROL (1MZ±FE)
10A
MIRROR±
HEATER FROM POWER SOURCE S YSTEM (
SEE PAGE 50)
1J 1115A
STOP
1C 7 10A
TAI L
1C 9
2 1
2 1
2 1
D 19 D 10 E 25 E 13 E 12 E 111R 5
2 4AAA
53A
A
B±Y B±Y B±Y B±Y
B±Y
E2 G VG IGF IGT3 IGT2 IGT1EVP1 EGR ACIS STP ELS2 ELS
LG Y±G R±Y G± W G± WG± WW B±YG± O G±O
B±Y B±Y B±Y R±BP W±R LG±B BR±YGR
B±Y
VSV (
INTAKE AIR CONTROL)
VSV (
EGR)
VSV (
EVAP) V 6
V 5 STOP LIGHT SW S 6
JUNCTION CONNECTOR
J20
MASS AIR
FL OW METE R M 2 1 2
BR C 11KSW
IGB B
A B
J 9
JUNCTION
CONNECTORA
A
JUNCTION
CONNECTOR J11
UNLOCK WARNING SW U 1L±B L±B
W±B W±B BR B(
*1)
B(
*1)
D 22
1 THA
L±Y
J12
JUNCTION
CONNECTORB CA A
JUNCTION CONNECTORB J2 7 J28
A
A
A
D 7 E 18 E 17 A 18 19A 15 A
B , J10
IG38
1D7
1M5
1 2
1J7
1M3
,
1R 4
E 7 BA, E 8
E10
ENGINE CONTROL MODULEE D, E11C , E 9 ,
V 4
D 3D11BR A
13 24
HT OX
W L±B(
*6)
BR B±Y
(
SHIELDED)(
*6)
(
*6)
(
*6)
(
*6)
HTR OXR1+B E1
HEATED OXYGEN SENSOR
(
BANK 1 SENSOR 1) H 3
L±B L±B
TO IGNI TER

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 water temp. is input into TERMINAL THW of the engine control module as a control signal.
(2) Intake air temp. signal circuit
The intake air temp. sensor is installed in the mass air flow meter and 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 TERMINALS OXL1, OXR1
(Except California) and OXS of the engine control module. To maintain stable detection performance by the heated
oxygen sensor, a heater is used for warming the sensor. The heater is also controlled by the engine control module
(HTL, HTR (Except California) and HTS).
(4) RPM signal circuit
Camshaft position and crankshaft position are detected by the camshaft position sensor and crankshaft position sensor.
The camshaft position is input as a control signal to TERMINAL G22+ of the engine control module, and the engine
RPM is input into 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
VTA1 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 is 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 control assembly (Automatic A/C) or A/C Amplifier (Manual A/C) inputs the A/C operations into TERMINAL A/C
of the engine control module as a control signal.
(9) Battery signal circuit
(California or w/ engine immobiliser and/or traction control)
Voltage is always supplies to TERMINAL BATT of the engine control module.
If you turn on the ignition SW, the current goes from TERMINAL MREL of the engine control module to the EFI relay and
put on the relay, and the voltage related to the engine control module operation is supplied to TERMINAL +B of the
engine control module through the EFI relay.
(Except California or w/ engine immobiliser and/or traction control)
Voltage is constantly applied to TERMINAL BATT of the engine control module. When the ignition SW is turned on,
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 mass air flow meter and a signal is input into TERMINAL VG of the engine control
module as a control signal.
(11) NSW 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) Engine knock signal circuit
Engine knocking is detected by the knock sensor 1 and 2, then the signals are input into TERMINALS KNKR and KNKL
of the engine control module as a control signal.
(13) Air fuel ratio signal circuit (California)
The air fuel ratio is detected and input as a control signal into TERMINALS AFL+, AFR+ of the engine control module.
SYSTEM OUTLINE