FI4741
(fig.1)
Acceptable
Resistance k
Ω
−
20
0
20
40
60
80
100
(
−
4)
32
68
104
140
176
212
30
20
10
5
3
2
1
0.5
0.3
0.2
0.1
Temp.
°
C (F
°
)
DI
−
26
−
DIAGNOSTICS
ENGINE
1996 LAND CRUISER (RM451U)
DTC
P0110
Intake Air Temp. Circuit Malfunction
CIRCUIT DESCRIPTION
The intake air temperature sensor is built into the air flow meter
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
(k
Ω
)
Voltage
(V)
−
20 (
−
4)
16.2
4.3
0 (32)
5.9
3.4
20 (68)
2.5
2.4
40 (104)
1.1
1.4
60 (140)
0.6
0.9
80 (176)
0.3
0.5
100 (212)
0.1
0.2
DTC No.
DTC Detecting Condition
Trouble Area
P0110
Open or short in intake air temp. sensor circuit
S
Open or short in intake air temp. sensor circuit
S
Intake air temp. sensor
S
ECM
HINT:
After confirming DTC P110 use the OBD II scan tool or TOYOTA hand
−
held tester to confirm the intake air
temp. from ”CURRENT DATA”.
Temp. Displayed
Malfunction
−
40
°
C (
−
40
°F)
Open circuit
140
°
C (284
°F) or more
Short circuit
DI5P1
−
02
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Version 1.00 - 12/21/2010