1996 TOYOTA RAV4 resistor

FI4741
20 30
10
5
3
2
0.1 0.2 0.3 0.51
−20
(−4) 0
(32) 20
(68) 40
(104) 60
(140) 80
(176)100
(212)
Temperature °C (°F) Acceptable
Resistance (Ω)
(fig. 1)
− DIAGNOSTICSENGINE
DI−25
1996 RAV4 (RM447U)
DTC P0110 Intake Air Temp. Circuit Malfunction
CIRCUIT DESCRIPTION
The intake air temp. sensor is built into the air cleaner cap and
senses the intake air temperature.
A thermistor built in the sensor changes the resistance value
according to the intake air temperature.
The lower the intake air temperature, the greater the thermistor
resistance value, and the higher the intake air temperature, the
lower the thermistor resistance value (See Fig. 1.).
The intake air temperature sensor is connected to the ECM
(See next page). The 5 V power source voltage in the ECM is
applied to the intake air temperature sensor from the terminal
THA via a resistor R.
That is , the resistor R and the intake air temperature sensor are
connected in series. When the resistance value of the intake air
temperature sensor changes in accordance with changes in the
intake air temperature, the potential at terminal THA also
changes. Based on this signal, the ECM increases the fuel in-
jection volume to improve driveability during cold engine opera-
tion.
If the ECM detects the DTC ”P0110”, it operates the fail safe
function in which the intake air temperature is assumed to be
20°C (68°F).
Intake Air Temp.
°C (°F)Resistance
(kΩ)Voltage
(V)
−20 (−4)16.24.3
0 (32)5.93.4
20 (68)2.52.4
40 (104)1.11.4
60 (140)0.60.9
80 (176)0.30.5
100 (212)0.20.3
DTC No.DTC Detecting ConditionTrouble Area
P0110Open or short in intake air temp. sensor circuit
Open or short in intake air temp. sensor circuit
Intake air temp. sensor
ECM
HINT:
After confirming DTC P0110 use the OBDII scan tool or TOYOTA hand−held tester to confirm the intake air
temperature from ”CURRENT DATA”.
Temperature DisplayedMalfunction
− 40°C (− 40°F)Open circuit
140°C (284°F) or moreShort circuit
DI3ZE−01

17
E
1. NORMALLY
OPENOpens and
closes circuits,
thereby
stopping (1) or
allowing (2)
current flow.
RESISTOR
An electrical component with a
fixed resistance, placed in a circuit
to reduce voltage to a specific
value.
RESISTOR, TAPPED
A resistor which supplies two or
more different non adjustable
resistance values.
SENSOR (Thermistor)
A resistor which varies its
resistance with temperature.
SHORT PIN
Used to provide an unbroken
connection within a junction
block.
SOLENOID
An electromagnetic coil which
forms a magnetic field when
current flows, to move a plunger,
etc.SWITCH, DOUBLE THROW
A switch which continuously
passes current through one set
of contacts or the other.
SWITCH,
IGNITION
A key operated switch with
several positions which allows
various circuits, particularly the
primary ignition circuit, to
become operational.
Wires are always
drawn as straight lines
on wiring diagrams.
Crossed wires (1)
without a black dot at
the junction are not
joined; crossed wires
(2) with a black dot or
octagonal (
) mark at
the juction as spliced
(joined) connections. RELAY, DOUBLE THROW
A relay which passes current
through one set of contacts or the
other.
SENSOR, SPEED
Uses magnetic impulses to open
and close a switch to create a
signal for activation of other
components.TRANSISTOR
A solid state device typically used
as an electronic relay; stops or
passes current depending on the
voltage applied at base.º SWITCH, WIPER PARK
Automatically returns wipers to
the stop position when the wiper
switch is turned off. SWITCH, MANUAL SPEAKER
An electromechanical device
which creates sound waves from
current flow.
2. NORMALLY
CLOSED
RESISTOR, VARIABLE OR
RHEOSTAT
A controllable resistor with a
variable rate of resistance.
Also called a potentiometer or
rheostat. 2. NORMALLY
OPEN RELAY
1. NORMALLY
CLOSEDBasically, an electrically
operated switch which may
be normally closed (1) or
open (2).
Current flow through a
small coil creates a
magnetic field which either
opens or closes an
attached switch.
(2) SPLICED WIRES
(1) NOT
CONNECTED

160
AIR CONDITIONING
IH 1 1
IG IB210
W-BB-L B-L
B-L
B-L
B-L B B B-W
B-W B-W
R-B
BR
OO
W-B
W-B
W-B W-B
W-B
FROM POW ER SOURCE SYSTEM (
SEE PAGE 54)
IBLE
K BLOCK
B-L
I 8
B-L
GAUGE
E BLOCK]
-L R-L
L-R50A H TR5FUS
LIN F 7 3
B BA C
JUN CTIO N
CONNECTORB J10 , J11A
R-L
IH 1 22 1
1324
B-W
BLOW ER RESISTORBLOWER MOTORB 4B 3
821
5
6 HI M2 M1
LO BLO WER S W B 5
OFF
10A
[FUS
4F 8
1B 81E 8
R
M
4C 84C1 4B 44C 7 4B 8
34 15
2 4B 74A2
4B 14B5127. 5A A/C HEATER
RELAY4B 9

162
AIR CONDITIONING
HEATER BLOWER MOTOR OPERATION
CURRENT IS APPLIED AT ALL TIMES THROUGH THE HTR FUSE TO TERMINAL 5 OF THE HEATER RELAY.
WHEN THE IGNITION SW IS TURNED ON, CURRENT FLOWS THROUGH THE GAUGE FUSE TO TERMINAL 1 OF THE HEATER RELAY
"THE COIL "TERMINAL 3 "TERMINAL 5 OF THE BLOWER SW.
*LOW SPEED OPERATION
WHEN THE BLOWER SW IS MOVED TO LO POSITION, THE CURRENT FLOWS TO TERMINAL 5 OF THE BLOWER SW "TERMINAL 6
"GROUND, CAUSING THE HEATER RELAY TO SWITCH ON. THIS CAUSES THE CURRENT TO FLOW FROM THE HTR FUSE "
TERMINAL 5 OF THE HEATER RELAY "TERMINAL 4 "TERMINAL 1 OF THE BLOWER MOTOR "TERMINAL 2 "TERMINAL 1 OF
THE BLOWER RESISTOR "TERMINAL 4 "GROUND, CAUSING THE BLOWER MOTOR TO ROTATE AT LOW SPEED.
*MEDIUM SPEED OPERATION (OPERATION AT M1, M2)
WHEN THE BLOWER SW IS MOVED TO M1 POSITION, THE CURRENT FLOWING TO TERMINAL 5 OF THE BLOWER SW "
TERMINAL 6 "GROUND, TURNS THE HEATER RELAY ON. THIS CAUSES THE CURRENT TO FLOW FROM THE HTR FUSE "
TERMINAL 5 OF THE HEATER RELAY "TERMINAL 4 "TERMINAL 1 OF THE BLOWER MOTOR "TERMINAL 2 "TERMINAL 1 OF
THE BLOWER RESISTOR "TERMINAL 2 "TERMINAL 1 OF THE BLOWER SW "TERMINAL 6 "GROUND. THIS TIME, THE
BLOWER RESISTANCE OF THE BLOWER RESISTOR IS LESS THAN AT LOW SPEED, SO THE BLOWER MOTOR ROTATES AT
MEDIUM LOW SPEED.
WHEN THE BLOWER SW IS MOVED TO M2 POSITION, CURRENT FLOWING THROUGH THE MOTOR FLOWS FROM TERMINAL 1 OF
THE BLOWER RESISTOR "TERMINAL 3 "TERMINAL 2 OF THE BLOWER SW "TERMINAL 6 "GROUND. THIS TIME,
RESISTANCE OF THE BLOWER RESISTOR IS LESS THAN AT M1 POSITION, SO THE BLOWER MOTOR ROTATES AT MEDIUM HIGH
SPEED.
*HIGH SPEED OPERATION
WHEN THE BLOWER SW IS MOVED TO HI POSITION, THE CURRENT FLOWS TO TERMINAL 5 OF THE BLOWER SW "TERMINAL 6
"GROUND AND TURNS THE HEATER RELAY ON.
THIS CAUSES THE CURRENT TO FLOW FROM THE HTR FUSE TO TERMINAL 5 OF THE HEATER RELAY "TERMINAL 4 "
TERMINAL 1 OF THE BLOWER MOTOR "TERMINAL 2 "TERMINAL 8 OF THE BLOWER SW "TERMINAL 6 "GROUND, CAUSING
THE BLOWER MOTOR TO ROTATE AT HIGH SPEED.
A 3 A/C DUAL PRESSURE SW
1-4 : OPEN WITH THE PRESSURE LESS THAN 2.0 KG/CM2 (30 PSI, 206 KPA) OR ABOVE 32 KG/CM2 (384 PSI, 2648 KPA)A12 A/C AMPLIFIER
12-5 : CONTINUITY WITH THE A/C CONTROL SW ON AND THE IGNITION SW AT ON POSITION
13-GROUND : ALWAYS CONTINUITY
05-GROUND : ALWAYS CONTINUITY
02-GROUND : APPROX. 12 VOLTS WITH THE IGNITION SW ON
A14 A/C THERMISTOR
1-2 : APPROX. 2341
234 W AT 15
C (59
F)
B 4 BLOWER RESISTOR
1-3 : APPROX. 0.4 W
1-2 : APPROX. 1.1 W
1-4 : APPROX. 2.8 W
B 5 BLOWER SW
5-6 : CONTINUITY WITH THE BLOWER SW AT LO, M1, M2 OR HI POSITION
1-6 : CONTINUITY WITH THE BLOWER SW AT M1 POSITION
2-6 : CONTINUITY WITH THE BLOWER SW AT M2 POSITION
8-6 : CONTINUITY WITH THE BLOWER SW AT HI POSITION
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
A 228B 430I 229
A 328B 530J 331
A1230D 330J 431
A1330E 631J10A31
A1430F 728J11B31
B 330F 831
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
625R/B NO. 6 (ENGINE COMPARTMENT LEFT)
SYSTEM OUTLINE
SERVICE HINTS

165
PERSONAL LIGHT
W IPER AND W ASHER SW
[COMB. SW ]
REAR WINDOW
DEFOGGER SW
COMBINATION M ETER
CRUISE CONTROL ECU
DOOR LO CK CONTROL
SW (
FRONT
PASSENGER' S SIDE)
DOOR KEY LOCK AND
UNLOCK SW (
FR ON T
PASSENGER' S SIDE)
BLOW ER SWTU RN SIG NA L FLA SHER
DATA LINK
CONNECTOR 3
CIGARETTE LIGHTER
O /D M AIN SW
REM OTE CONTROL
MIRROR SW
BUCKLE SW LH
CLOCK
CRUISE CONTROL SW
[COMB. SW ]
UNLOCK W ARNING SW
LIGHT CONTROL SW
[COMB. SW ]
FUEL SENDER (
MAIN)
RADIO AND PLAYER
C O M B IN A TIO N M E TE R SHIFT LOCK ECU
KEY INTERLOCK
SOLENOID
A/C AMPLIFIER
BLOW ER RESISTOR
DOOR LO CK CONTROL
RELAY
POWER W INDOW MASTER
SW
DOOR KEY LOCK AND
UNLOCK SW
(
DRIVER' S SIDE)
RHEOSTATIE 16
A A
A A
A A
A A
A A
IGA AB A
B A
B A
B A
B A
B 8
II1 16
B C
B C
B C A B
A B
A B
ID I 2 IC 116
B 2
IF IEID 110 W-B
W-B
W-BW-B
W-B
W-B
W-B
W-B
W-BW-B
W-B
W-B
W-B
W-B
W-B
W-B
W-B
W-B
W-B
W-B
BR
BR
BR W-
W-
W-
W-
W-
W-B
W-B
W-B
W-B
W-B W -B5
(
A/T)
B J10 , J11
A
JUNCTION CONNECTOR
B J10 , J11
A
JUNCTION CONNECTOR
(
A/
W-B
W-B W-B
W W-B
BR-B
W-B W-B
(
E2)
(
E1) AIRBAG SENSOR
ASSEMBLY
B
B
B
B
B T)W-B -BW
-B
4C3
4C10
4C7
4C8
4C94C 1
4C2
W
1D5
1H16
1H 71I 9

K OVERALL ELECTRICAL WIRING DIAGRAM
1
234
20 RAV4
1 AC C
IG 1
IG 2
ST2 AM1
2
AM2
1D 9
1K 4
21D 7
1E 81F 1
1B 84B 74A2
22 1
M 4B 5 4B 1
2IH1 1IH12 1
5 3 66
66
6 EA1
3 IB210
3IG2
11 IB2 4C 7 4C 1 4C 8 4B 8
4
4 87 10 13 14 9 12 2 5 1 2 8
6
IG 2 3 1
1 2 1
4
5 HI M2 M1 LO64 5
15
6
1 I1 0
IG N ITION S W
F 8
10A
GAUGE
[FU S E
BLOCK]
BBB-WB-WB- W
W W R-L L-R
BR-LR-LR-L O
L-R L- B B-R B-R Y
W-RR-Y Y-GB
Y
G-W
L BR BR W-R
L-B
W-BL-Y
L-B
OW-B W-B
W-B W-B
R-B
BR
W
B-L
R-W B-L
B-L
B 4
BLOWER RESISTOR
Power Source Air Conditioning
R ight kick panel 34 B-Y
7. 5A A/C
B 3
BLOWER MOTORB-L
A 3
A/C DUAL PRESSURE SW
L- Y
F 7
FUSIBLE
LINK BLOCK
BATTERY
50A HTR 100A ALT
B 5
BLO W ER SWA13
A/C CONTROL
SW
2 1
A 2
A/C MAGNETIC CLUTCH
AND LOCK SENSOR
A14
A/C THERMISTOR
IG- E IG+ MGC TE SSR- SSR+ LED+ A/C ACT AC1
A12
A/C AMPLIFIER
To E ngine C ontrol
M odule< 2- 2 F rom Ign iter< 5- 4
B-L MG/C RELAY ON
OFF
HEATER
RELAY
40A
AM1
521
43
2 24
G-W
B- L
To FAN NO. 3
Relay< 19-4 B-L
4IG2
12 IB2
BR F rom E ngine C ontrol
Module<2-2
B-L 4B 94B4
BR
A
A
A
J 3
JUNCTION
CONNECTOR
B- L
B-L
1 2B- L
Y D 3
D EFR OSTER
MODE SW
W-B
CA
BB J10 A , J11 B
JU NC TION
CONNECTOR
AAAAAA
BBBCCC JUNCTION CONNECTOR
B J11 G R A YA J10 G R A Y
OFF