P0110 - Toyota Corolla 2002 Repair Manual Supplement

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05- -64
DTC
CIRCUIT DESCRIPTION
(Figure 1)
30
20
10
0.5
0.3
0.2
0.1
--20
(--4) (32) (68)
F14741
Temperature _C (_F)
HINT:
When the IAT sensor output is outside the normal range, the ECM determines this as a malfunction.
DTC No.
Condition (a) or (b) continues for 2.0 seconds or more:
(a) IAT sensor output is less than --40˚C (--40˚F)
(The MIL is illuminated and a DTC is set when the same mal-
function is detected on 2 consecutive trips*
*: One trip is counted when the ignition switch is turned from
OFF to ON and back to OFF)

P0110

(b) IAT sensor output is more than 135˚C (275˚F)
(The MIL is illuminated and a DTC is set when the same mal-
function is detected on 2 consecutive trips*
*: One trip is counted when the ignition switch is turned from
OFF to ON and back to OFF)
HINT:
DTC P0110 is set when the engine idles for approximately 15 seconds.
S
When DTC P0110 is set, check the intake air temperature by selecting Powertrain / Engine and ECT
S
/ Data List / Intake Air on the intelligent tester ll.
Temperature Displayed
Less than --40˚C (--40˚F)
More than 135˚C (275˚F)
COROLLA Supplement (RM1129E)
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DIAGNOSTICS
P0110 INTAKE AIR TEMPERATURE CIRCUIT
Acceptable
60
20 40 80 100
(104) (140) (176) (212)
A56276
DTC Detecting Condition
TOYOTA COROLLA REPAIR MANUAL SUPP 1129E
-- ECD SYSTEM (1ND--TV)
The Intake Air Temperature (IAT) sensor is built into the Mass
Air Flow (MAF) meter, and monitors the intake air temperature.
The IAT sensor has a built--in thermistor that varies its resis-
tance depending on the temperature of the intake air. When the
air temperature is low, the resistance in the thermistor in-
creases. When the temperature is high, the resistance drops.
The variations in resistance are reflected as voltage changes
to the ECM terminal (see figure 1).
The IAT sensor is connected to the ECM. The 5 V power source
voltage in the ECM is applied to the IAT sensor from terminal
THA via resistor R.
Resistor R and the IAT sensor are connected in series. When
the resistance value of the IAT sensor changes in accordance
with changes in the intake air temperature, the voltage at termi-
nal THA also changes. Based on this signal, the ECM increases
the fuel injection volume to improve the driveability during cold
engine operation.
S Open or short in intake air temperature sensor circuit
S Short in power source circuit
S Intake air temperature sensor (built into mass air flow meter)
S ECM
Open circuit or short +B circuit
Short circuit
Trouble Area
Malfunction
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05CPL--13