1996 TOYOTA RAV4 air condition

DI3ZA−02
A07400
E4E5E6 DI−18
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
TERMINALS OF ECM
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
BATT (E6−1) − E1 (E4−14)R−W ↔ BRAlways9 ∼ 14
+B (E6−12) − E1 (E4−14)B−R ↔ BRIG switch ON9 ∼ 14
VC (E5−1) − E2 (E5−9)Y ↔ BRIG switch ON4.5 ∼ 5.5
VTA (E5−11) − E2 (E5−9)L−R ↔ BR
IG switch ON
Throttle valve fully closed.0.3 ∼ 0.8
IG switch ON
Throttle valve fully open.3.2 ∼ 4.9
PIM (E5−2) − E2 (E5−9)LG−R ↔ BR
IG switch ON3.3 ∼ 3.9
Apply vacuum 26.7 kpa
(200 mmHg, 7.9 in. Hg)2.5 ∼ 3.1
THA (E5−3) − E2 (E5−9)Y−B ↔ BRIdling, Intake air temp. 20°C (68°F)0.5 ∼ 3.4
THW (E5−4) − E2 (E5−9)W ↔ BRIdling, Engine coolant temp. 80°C (176°F)0.2 ∼ 1.0
STA (E6−11) − E1 (E4−14)B−W (M/T) ↔ BRCranking6.0 or more
STA (E6−11) − E1 (E4−14)B (A/T) ↔ BRCranking6.0 or more
#10 (E4−12) − E01 (E4−13)B−R ↔ BR
IG switch ON9 ∼ 14
IdlingPulse generation
(See page DI−51)
#20 (E4−11) − E01 (E4−13)B−Y ↔ BR
IG switch ON9 ∼ 14
IdlingPulse generation
(See page DI−51)
#30 (E4−25) − E01 (E4−13)B−R ↔ BR
IG switch ON9 ∼ 14
IdlingPulse generation
(See page DI−51)
#40 (E4−24) − E01 (E4−13)B−Y ↔ BR
IG switch ON9 ∼ 14
IdlingPulse generation
(See page DI−51)
IGT (E4−20) − E1 (E4−14)B ↔ BRIdlingPulse generation
(See page DI−100)
IGF (E4−3) − E1 (E4−14)L−Y ↔ BR
IG switch ON
Disconnect igniter connector4.5 ∼ 5.5
IdlingPulse generation
(See page DI−100)
G (E4−5) − NE (E4−14)B ↔ GIdlingPulse generation
(See page DI−59)
NE (E4−4) − NE (E4−17)R ↔ GIdlingPulse generation
(See page DI−59)

DI3ZC−01
P01242
(V)
(3.96)
3.6
2.4
1.2
150 450 750 (840)mmHg
20
60
100(112)
Manifold Absolute PressurekPa
Output Voltage
− DIAGNOSTICSENGINE
DI−21
1996 RAV4 (RM447U)
CIRCUIT INSPECTION
DTC P0105 Manifold Absolute Pressure / Barometric
Pressure Circuit Malfunction
CIRCUIT DESCRIPTION
By a built−in sensor unit, the manifold absolute pressure sensor
detects the intake manifold pressure as a voltage. The ECM
then determines the basic injection duration and basic injection
advance angle based on this voltage. Since the manifold abso-
lute pressure sensor does not use the atmospheric pressure as
a criterion, but senses the absolute pressure inside the intake
manifold (the pressure in proportion to the present absolute
vacuum 0) , it is not influenced by fluctuations in the atmospher-
ic pressure due to high altitude and other factors. This permits
it to control the air−fuel ratio at the proper lever under all condi-
tions.
DTC No.DTC Detecting ConditionTrouble Area
P0105Open or short manifold absolute pressure sensor circuit
Open or short in manifold absolute pressure sensor circuit
Manifold absolute pressure sensor
ECM
If the ECM detects DTC ”P0105” it operates the fail safe function, keeping the ignition timing and injection
volume constant and making it possible to drive the vehicle.
HINT:
After confirming DTC P0105 use the OBDII scan tool or TOYOTA hand−held tester to confirm the manifold
absolute pressure from ”CURRENT DATA”.
Manifold Absolute PressureMalfunction
0 kpaPIM circuit short
130 kpa or more
VC circuit open or short
PIM circuit open
E2 circuit open

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

P19746
Engine Coolant Temp. Sensor
W
BRE5
E5E2THW5V
E1 94ECM
2
1
− DIAGNOSTICSENGINE
DI−29
1996 RAV4 (RM447U)
DTC P0115 Engine Coolant Temp. Circuit Malfunction
CIRCUIT DESCRIPTION
A thermistor built into the engine coolant temperature sensor changes the resistance value according to the
engine coolant temperature.
The structure of the sensor and connection to the ECM is the same as in the intake air temp. circuit malfunc-
tion shown on page DI−25.
If the ECM detects the DTC P0115, it operates the fail safe function in which the engine coolant temp. is
assumed to be 80°C (176°F).
DTC No.DTC Detecting ConditionTrouble Area
P0115Open or short in engine coolant temp. sensor circuit
Open or short in engine coolant temp. sensor circuit
Engine coolant temp. sensor
ECM
HINT:
After confirming DTC P0115 use the OBDII scan tool or TOYOTA hand−held tester to confirm the engine
coolant temperature from ”CURRENT DATA”.
Temperature DisplayedMalfunction
− 40°C (− 40°F)Open circuit
140°C (284°F) or moreShort circuit
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTC ”P0105” (Manifold Absolute Pressure / Barometric Pressure Circuit Malfunction), ”P0110” (Intake Air
Temp. Circuit Malfunction), ”P0115” (Engine Coolant Temp. Circuit Malfunction), ”P0120” (Throttle / Pedal
Position Sensor / Switch ”A” Circuit Malfunction) are output simultaneously, E2 (sensor ground) may be
open.
DI3ZF−01

P24296
Throtttle Position
SensorECM
VC
VTA
E2 DI−34
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
DTC P0120 Throttle/Pedal Position Sensor/Switch ”A”
Circuit Malfunction
CIRCUIT DESCRIPTION
The throttle position sensor is mounted in the throttle body and
detects the throttle valve opening angle. When the throttle valve
is fully closed, a voltage of approximately 0.3 V − 0.8 V is ap-
plied to terminal VTA of the ECM. The voltage applied to the ter-
minal VTA of the ECM increases in proportion to the opening
angle of the throttle valve and becomes approximately 3.2 − 4.9
V when the throttle valve is fully opened. The ECM judges the
vehicle driving conditions from this signal input from terminal
VTA, and uses them as one of the conditions for deciding the
air−fuel ration correction, power increases correction and fuel−
cut control etc.
DTC No.DTC Detecting ConditionTrouble Area
P0120
Condition (a) or (b) continues
(a) VTA < 0.1 V
(b) VTA > 4.9 VOpen or short in throttle position sensor circuit
Throttle position sensor
ECM
HINT:
After confirming DTC P0120 use the OBDII scan tool or TOYOTA hand−held tester to confirm the throttle
valve opening percentage.
Throttle Valve opening position expressed as percentageTrouble AreaThrottle Valve fully closedThrottle Valve fully open
0 %0 %VC line open
VTA line open or short
100 %100 %E2 line open
DI3ZH−01

FI6606FI7210A06619
Atmosphere
Flange
Platinum Electrode
Solid Electrolyte
(Zirconia Element)
Platinum Electrode
Coating (Ceramic)
Richer−air Fuel Ratio−Leaner Ideal Air−Fuel Mixture
Output Voltage
Cover
Exhaust Gas
− DIAGNOSTICSENGINE
DI−39
1996 RAV4 (RM447U)
DTC P0125 Insufficient Coolant Temp. for Closed Loop
Fuel Control
CIRCUIT DESCRIPTION
To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three−way cata-
lytic converter is used, but for the most efficient use of the three−way catalytic converter, the air−fuel ratio
must be precisely controlled so that it is always close to the stoichiometric air−fuel ratio.
The oxygen sensor has the characteristic whereby its output voltage changes suddenly in the vicinity of the
stoichiometric air−fuel ratio. This characteristic is used to detect the oxygen concentration in the exhaust
gas and provide feedback to the computer for control of the air−fuel ratio.
When the air−fuel ratio becomes LEAN, the oxygen concentration in the exhaust increases and the oxygen
sensor informs the ECM of the LEAN condition (small electromotive force: 0 V).
When the air−fuel ratio is RICHER than the stoichiometric air−fuel ratio the oxygen concentration in the ex-
haust gas is reduced and the oxygen sensor informs the ECM of the RICH condition (large electromotive
force: 1 V).
The ECM judges by the electromotive force from the oxygen sensor whether the air−fuel ratio is RICH or
LEAN and controls the injection time accordingly. However, if malfunction of the oxygen sensor causes out-
put of abnormal electromotive force, the ECM is unable to perform accurate air−fuel ratio control.
DTC No.DTC Detecting ConditionTrouble Area
P0125
After the engine is warmed up, oxygen sensor output does not
indicate RICH even once when conditions (a), (b), and (c)
continue for at least 1.5 minutes
(a) Engine speed: 1,500 rpm or more
(b) Vehicle speed: 40 ∼ 100 km/h (25 ∼ 62 mph)
(c) Throttle valve does not fully closed
Open or short in oxygen sensor circuit
oxygen sensor
HINT:
After confirming DTC P0125 use the OBDII scan tool or TOYOTA hand−held tester to confirm voltage output
of oxygen sensor from ”CURRENT DATA”.
If voltage output of oxygen sensor is 0 V, oxygen sensor circuit may be open or short.
DI3ZJ−01

− DIAGNOSTICSENGINE
DI−43
1996 RAV4 (RM447U)
INSPECTION PROCEDURE
1 Check for open and short in harness and connector between ECM and oxygen
sensor (See page IN−30).
NG Repair or replace harness or connector.
OK
2 Check for oxygen sensor date.
PREPARATION:
(a) Connect the OBDII scan tool or TOYOTA hand−held tester to the DLC 3.
(b) Warm up engine to normal operation temperature.
CHECK:
Read the oxygen sensor output voltage and short−term fuel trim.
RESULT:
PatternOxygen sensor output voltageShort−term fuel trim
1Lean condition (Changes at 0.55 V or less)Changes at about +20 %
2Rich condition (Changes at 0.35 V or more)Changes at about −20 %
3Except 1 and 2
1, 2 Check fuel trim system (See page DI−48).
3

DI−46
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
DTC P0136 Oxygen Sensor Circuit Malfunction
(Bank 1 Sensor 2)
CIRCUIT DESCRIPTION
Refer to ”Insufficient Coolant Temp. for Closed Loop Fuel Control” on page DI−39.
DTC No.DTC Detecting ConditionTrouble Area
P0136
Voltage output of the oxygen sensor (bank 1 sensor 2)
remains at 0.4 V or more or 0.5 V or less when the vehicle is
driven at 40km/h (25 mph) or more after the engine is warmed
up
(2 trip detection logic)
Oxygen sensor
HINT:
Sensor 2 refers to the sensor farther away from the engine body.
WIRING DIAGRAM
Refer to page DI−39 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Are there any other codes (besides DTC P0136) being output?
YES Go to relevant DTC chart.
NO
2 Check for open and short in harness and connector between ECM and oxygen
sensor (See page IN−30).
NG Repair or replace harness or connector.
OK
DI3ZM−01