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EC-1354
[YD (WITH EURO-OBD)]
DTC P1472, P1473 ENGINE ROOM AIR TEMPERATURE SENSOR
DTC P1472, P1473 ENGINE ROOM AIR TEMPERATURE SENSOR PFP:22630
Description BBS002KZ
Engine room air temperature sensor detects ambient temperature
around differential exhaust pressure sensor. Engine room air tem-
perature sensor converts the temperature in to a voltage signal and
sent the signal to ECM. Based on the signal, ECM compensate for
the characteristic of differential exhaust pressure sensor which
changes with the temperature.
Engine room air temperature sensor uses a thermistor which is sen-
sitive to the change in temperature. Electrical resistance of the ther-
mistor decreases in response to the temperature rise.
<Reference data>
*: This data is reference value and is measured between ECM terminal 79 (Engine
room air temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis Logic BBS002L0
DTC Confirmation Procedure BBS002L1
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Wait at least 5 seconds.
4. If 1st trip DTC is detected, go to EC-1357, "
Diagnostic Proce-
dure" .
SEF594K
Engine room air tempera-
ture °C (°F)
Voltage* (V) Resistance (kΩ)
−10 (14) 4.7 7.0 - 11.4
20 (68) 3.8 2.1 - 2.9
50 (122) 2.6 0.68 - 1.00
90 (194) 1.3 0.236 - 0.260
SEF012P
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1472
1472
Engine room air tempera-
ture sensor circuit low
input
An excessively low voltage from the sensor is
sent to ECM.
● Harness or connectors
(The sensor circuit is open or
shorted.)
● Engine room air temperature sensor
P1473
1473
Engine room air tempera-
ture sensor circuit high
input
An excessively high voltage from the sensor is
sent to ECM.
SEF817Y
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