A15475
Fig. 1
Acceptable
Resistance k
Ω
−
20
0
20
40
60
80
100
(
−
4)
(32)
(68) (104) (140) (176) (212)
30
20
10
1
0.1
Temp.
°
C (
°
F)
−
DIAGNOSTICS
ENGINE (2ZZ
−
GE)
DI
−
375
2005 CELICA (RM1131U)
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
air flow (MAF) meter, monitors the intake air temperature. The
IAT sensor has a thermistor that varies its resistance depending
on the temperature of the intake air. When the air temperature
is low, the resistance in the thermistor increases. When the tem-
perature is high, the resistance drops. The resistance varies as
voltage changes to the ECM terminal. (See Fig. 1).
The intake air temperature sensor is connected to the ECM.
The 5 V power source voltage in the ECM is applied to the in-
take air temperature sensor from terminal THA (THAR) via re-
sistor 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 (THAR)
also changes. Based on this signal, the ECM increases the fuel
injection volume to improve the driveability during cold engine
operation.
DTC No.
Proceed to
DTC Detection Condition
Trouble Area
P0110
Step 1
Open or short in intake air
temperature sensor circuit for
0.5 sec.
S
Open or short in intake air temperature sensor circuit
S
Intake air temperature sensor (built in mass air flow meter)
S
ECM
P0112
Step 4
Short in intake air tempera-
ture sensor circuit for 0.5 sec.
P0113
Step 2
Open in intake air tempera-
ture sensor circuit for 0.5 sec.
HINT:
After confirming DTC ”P0110, P0112 or P0113”, use the hand
−
held tester or the OBD II scan tool to confirm
the intake air temperature in the ”DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL”.
Temperature Displayed
Malfunction
−
40
°
C (
−
40
°F
)
Open circuit
140
°
C ( 284
°F
) or more
Short circuit
DI37Z
−
18
573
Содержание Celica 2005
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