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EC-144
[QR (WITH EURO-OBD)]
DTC P0037, P0038 HO2S2 HEATER
DTC P0037, P0038 HO2S2 HEATER PFP:226A0
Description EBS010MT
SYSTEM DESCRIPTION
OPERATION
CONSULT-II Reference Value in Data Monitor Mode EBS010MU
Specification data are reference values.
On Board Diagnosis Logic EBS010MV
DTC Confirmation Procedure EBS010MW
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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at
idle.
Sensor Input Signal to ECM ECM function Actuator
Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)
Engine speed
Heated oxygen sensor 2
heater control
Heated oxygen sensor 2 heater
Engine coolant temperature sensor Engine coolant temperature
Mass air flow sensor Amount of intake air
Engine speed rpm Heated oxygen sensor 2 heater
Above 3,600 OFF
Below 3,600 rpm after the following conditions are met.
● Engine: After warming up
● Keeping the engine speed between 3,500 and 4,000 rpm for 1
minute and at idle for 1 minute under no load
ON
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 HTR (B1)
● Engine speed is below 3,600 rpm after the following conditions are met
– Warm-up condition
– Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute
and at idle for 1 minute under no load
ON
● Engine speed: Above 3,600 rpm OFF
DTC No.
Trouble diagnosis
name
DTC detecting condition Possible cause
P0037
0037
Heated oxygen
sensor 2 heater
control circuit low
The current amperage in the heated oxygen sen-
sor 2 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM
through the heated oxygen sensor 2 heater.)
● Harness or connectors
(The heated oxygen sensor 2 heater circuit is
open or shorted.)
● Heater oxygen sensor 2 heater
P0038
0038
Heated oxygen
sensor 2 heater
control circuit high
The current amperage in the heated oxygen sen-
sor 2 heater circuit is out of the normal range.
(An excessively high voltage signal is sent to
ECM through the heated oxygen sensor 2
heater.)
● Harness or connectors
(The heated oxygen sensor 2 heater circuit is
shorted.)
● Heater oxygen sensor 2 heater
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