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EC-1238
[YD (WITH EURO-OBD)]
DTC P0427, P0428 FRONT EXHAUST GAS TEMPERATURE SENSOR
DTC P0427, P0428 FRONT EXHAUST GAS TEMPERATURE SENSOR PFP:22630
Description BBS002JX
Front exhaust gas temperature sensor (3) is installed before DPF
and senses exhaust gas temperature. Front exhaust gas tempera-
ture sensor uses a thermistor which is sensitive to the change in
temperature. Electrical resistance of the thermistor decreases in
response to the temperature rise.
● : Vehicle front
● Rear exhaust gas temperature sensor (1)
● Oxidation Catalyst with DPF (2)
<Reference data>
*: This data is reference value and is measured between ECM terminal 56 (Front
exhaust gas 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 BBS002JY
DTC Confirmation Procedure BBS002JZ
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-1241, "
Diagnostic Proce-
dure" .
PBIB3155E
Engine coolant
temperature °C (°F)
Voltage* V Resistance kΩ
20 (68) 5.2 242
100 (212) 5.1 33.6
350 (662) 3.5 1.71
500 (992) 2.3 0.673
PBIB3164E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0427
0427
Front exhaust gas temper-
ature 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.)
● Front exhaust gas temperature sen-
sor
P0428
0428
Front exhaust gas temper-
ature sensor circuit high
input
An excessively high voltage from the sensor is
sent to ECM.
SEF817Y
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