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EC-1244
[YD (WITH EURO-OBD)]
DTC P0437, P0438 REAR EXHAUST GAS TEMPERATURE SENSOR
DTC P0437, P0438 REAR EXHAUST GAS TEMPERATURE SENSOR PFP:22630
Description BBS002K4
Rear exhaust gas temperature sensor (1) is installed after DPF and
senses exhaust gas temperature. Rear exhaust gas temperature
sensor uses a thermistor which is sensitive to the change in temper-
ature. Electrical resistance of the thermistor decreases in response
to the temperature rise.
● : Vehicle front
● Oxidation Catalyst with DPF (2)
● Front exhaust gas temperature sensor (3)
<Reference data>
*: This data is reference value and is measured between ECM terminal 57 (Rear
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 BBS002K5
DTC Confirmation Procedure BBS002K6
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-1247, "
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
P0437
0437
Rear 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.)
● Rear exhaust gas temperature sen-
sor
P0438
0438
Rear exhaust gas temper-
ature sensor circuit high
input
An excessively high voltage from the sensor is
sent to ECM.
SEF817Y
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