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DI-109
DIAGNOSTICS - ENGINE (1GR-FE)
DIDTA-01
DTC P0110 Intake Air Temperature Circuit
DTC P0112 Intake Air Temperature Circuit Low Input
DTC P0113 Intake Air Temperature Circuit High Input
CIRCUIT DESCRIPTION
The intake air temperature (IAT) sensor, mounted on the mass
(Fig.1) air flow (MAF) meter, monitors the intake air temperature. The
IAT sensor has a thermistor that varies its resistance depending
30 on the temperature of the intake air. When the air temperature
20
is low, the resistance in the thermistor increases. When the tem-
10 perature is high, the resistance drops. The resistance varies as
Acceptable voltage changes to the ECM terminal.
5
Resistance K
3
(See Fig. 1).
2 The intake air temperature sensor is connected to the ECM
(See below ). The 5 V power source voltage in the ECM is ap-
1
plied to the intake air temperature sensor from terminal THA
0.5
0.3
(THAR) via resistor R.
That is, the resistor R and the intake air temperature sensor are
0.2
connected in series. When the resistance value of the intake air
0.1 temperature sensor changes in accordance with changes in the
intake air temperature, the voltage at terminal THA (THAR) also
- 20 0 20 40 60 80 100
(- 4) 32 68 104 140 176 212 changes. Based on this signal, the ECM increases the fuel in-
Temp. _C (_F) jection volume to improve the driveability during cold engine op-
A21047 eration.
DTC No. Proceed to DTC Detection Condition Trouble Area
Open or short in intake air
P0110 Step 1 temperature sensor circuit for
0.5 sec.
S Open or short in intake air temperature sensor circuit
Short in intake air tempera- S Intake air temperature sensor (built in mass air flow meter)
P0112 Step 4
ture sensor circuit for 0.5 sec. S ECM
Open in intake air tempera-
P0113 Step 2
ture sensor circuit for 0.5 sec.
HINT:
After confirming DTC "P0110, P0112 or P0113", use the hand-held tester to confirm the intake air tempera-
ture in the "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL".
Temperature Displayed Malfunction
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