1996 TOYOTA RAV4 P0110

− DIAGNOSTICSENGINE
DI−7
1996 RAV4 (RM447U)
(10) After checking the DTC, inspect the applicable cir-
cuit.
(b) Clear the DTC.
The following actions will erase the DTC and freezed
frame data.
(1) Operating the OBDII scan tool (complying with SAE
J1978) or TOYOTA hand−held tester to erase the
codes.
(See the OBDII scan tool’s instruction book for oper-
ating instructions.)
(2) Disconnecting the battery terminals or EFI fuse.
NOTICE:
If the TOYOTA hand−held tester switches the ECM from
normal mode to check mode or vice−versa, or it the ignition
switch is turned from ON to ACC or OFF during check
mode, the DTC and freezed frame data will be erased.
4. FAIL−SAFE CHART
If any of the following codes is recorded, the ECM enters fail−sate mode.
DTC No.Fail−Safe OperationFail−Safe Deactivation Conditions
P0105Ignition timing fixed at 5° BTDCReturned to normal condition
P0110Intake air temp. is fixed at 68°F (20°C)Returned to normal condition
P0115Engine coolant temp. is fixed at 176°F (80°C)Returned to normal condition
P0120VTA is fixed at 0°
The following condition must be repeated at least
2 times consecutively
When closed throttle position switch is ON:
0.1 V  VTA  0.95 V
P0325Max. timing retardationIgnition switch OFF
P1300Fuel cutIGF signal is detected for 1 ignition
5. CHECK FOR INTERMITTENT PROBLEMS
TOYOTA hand−held tester only:
By putting the vehicle’s ECM in check mode, 1 trip detection logic possible instead of 2 trip detection logic
and sensitivity to detect open circuit is increased. This makes it easier to detect intermittent problems.
(1) Clear the diagnostic trouble codes (See page DI−3)
(2) Set the check mode (See page DI−3)
(3) Perform a simulation test (See page IN−20)
(4) Check the connector and terminal inspection (See page IN−30)
(5) Visual check and contact pressure (See page IN−30)
(6) Handle the connector (See page IN−30)

DI3Z8−02
DI−14
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument
or other factors.
If a malfunction code is displayed during the DTC check in check mode, check the circuit for that code listed
in the table below, for details of each code, turn to the page referred to under the ”See page” for the respec-
tive ”DTC No.” in the DTC chart.
SAE DEFINED
DTC No.
(See Page)Detection ItemTrouble AreaMILMemory
P0105
(DI−21)
Manifold Absolute
Pressure / Barometric
Pressure Circuit
MalfunctionOpen or short in Manifold absolute pressure sensor circuit
Manifold absolute pressure sensor
ECM
 *1
P0106
(DI−24)
Manifold Absolute
Pressure / Barometric
Pressure Circuit
Ranger / Performance
Problem
Manifold absolute pressure sensor *1
P0110
(DI−25)Intake Air Temp. Circuit
MalfunctionOpen or short in take air temp. sensor circuit
Intake air temp. sensor
ECM
 *1
P0115
(DI−29)Engine Coolant Temp. Circuit
MalfunctionOpen or short in engine coolant temp. sensor circuit
Engine coolant temp. sensor
ECM
 *1
P0116
(DI−33)Engine Coolant Temp. Circuit
Range / Performance ProblemEngine coolant temp. sensor
Cooling system *1
P0120
(DI−34)Throttle / Pedal Position
Sensor / Switch ”A” Circuit
MalfunctionOpen or short in throttle position sensor circuit
Throttle position sensor
ECM
 *1
P0121
(DI−38)Throttle / Pedal Position
Sensor / Switch ”A” Circuit
Range / Performance Problem
Throttle position sensor *1
P0125
(DI−39)Insufficient Coolant Temp. for
Closed Loop Fuel ControlOpen or short in oxygen sensor circuit
Oxygen sensor *1
P0130
(DI−42)Oxygen Sensor Circuit Malfunc-
tion
(Bank 1 Sensor 1)Oxygen sensor
Fuel trim malfunction *1
P0133
(DI−45)Oxygen Sensor Circuit Slow
Response
(Bank 1 Sensor 1)
Oxygen sensor *1
P0136
(DI−46)Oxygen Sensor Circuit
Malfunction
(Bank 1 Sensor 2)
Oxygen sensor *1
P0171
(DI−48)System too Lean
(Fuel Trim)
Air Intake (hose loose)
Fuel line pressure
Injector blockage
Oxygen sensor malfunction
Manifold absolute pressure sensor
Engine coolant temp. sensor
 *1
*1: MIL lights up

P25423
Manifold Absolute Pressure Sensor
3
2
1E51
2
BR LG−R Y
VC
PIM
E25 V ECM
9 E5
E5
E1
A00389
ON
E2
(−)VC
(+)
DI−22
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTC P0105, P0110, P0115, P0120 are output simultaneously, E2 (sensor ground) may be open.
1 Connect OBDII scan tool or TOYOTA hand−held tester, and read value of man-
ifold absolute pressure.
PREPARATION:
(a) Connect the OBDII scan tool or TOYOTA hand−held tester to the DLC3.
(b) Turn ignition switch ON and OBDII scan tool or TOYOTA hand−held tester main switch ON.
CHECK:
Read value of manifold absolute pressure on the OBDII scan tool or TOYOTA hand−held tester.
OK:
Same as atmospheric pressure.
OK Check for intermittent problems
(See page DI−3).
NG
2 Check voltage between terminals VC and E2 of ECM connector.
PREPARATION:
(a) Remove side trim cover (See page SF−61).
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals VC and E2 of ECM con-
nector.
OK:
Voltage : 4.5 − 5.5V

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

P19745
Intake Air Temp. Sensor
Y−B
BRE5
E5E2 THAR5V
E1 93ECM
2
1
DI−26
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
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.
1 Connect the OBDII scan tool or TOYOTA hand−held tester, and read value of
intake air temperature.
PREPARATION:
(a) Connect the OBDII scan tool or TOYOTA hand−held tester to the DLC3.
(b) Turn ignition switch ON and OBDII scan tool or TOYOTA hand−held tester main switch ON.
CHECK:
Read temperature value on the OBDII scan tool or TOYOTA hand−held tester.
OK:
Same as actual intake air temperature.
HINT:
If there is open circuit, OBDII scan tool or TOYOTA hand−held tester indicates − 40°C (− 40°F).
If there is short circuit, OBDII scan tool or TOYOTA hand−held tester indicates 140°C (284°F) or more.
NG− 40°C (− 40°F) .... Go to step 2.
140°C (284°F) .... Go to step 4.
OK
Check for intermittent problems.
(See page DI−3).

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

P25426
Throttle Position Sensor
4
E5
3
2L
1
BR L−R Y5V
VC
VTA
E2
E1 From Cruise
Control ECU1
11
9 E5
E5ECM
FI7052
− DIAGNOSTICSENGINE
DI−35
1996 RAV4 (RM447U)
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.
1 Connect OBDII scan tool or TOYOTA hand−held tester and read the throttle valve
opening percentage.
PREPARATION:
(a) Connect the OBDII scan tool or TOYOTA hand−held tester to the DLC3.
(b) Turn ignition switch ON and OBDII scan tool or TOYOTA hand−held tester main switch ON.
CHECK:
Read the throttle valve opening percentage.
OK:
Throttle valveThrottle valve opening position
expressed as percentage
Fully openApprox. 70 %
Fully closedApprox. 10 %