Nissan Frontier D22. Manual — part 257
DTC P0037, P0038 HO2S2 HEATER
EC-131
[KA24DE]
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EC
DTC P0037, P0038 HO2S2 HEATER
PFP:226A0
Description
UBS00D24
SYSTEM DESCRIPTION
The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed,
amount of intake air and engine coolant temperature.
OPERATION
CONSULT-II Reference Value in Data Monitor Mode
UBS00D25
Specification data are reference values.
On Board Diagnosis Logic
UBS00D26
Sensor
Input Signal to ECM
ECM function
Actuator
Camshaft position sensor
Engine speed
Heated oxygen sensor
2 heater control
Heated oxygen sensor 2 heater
Engine coolant temperature sensor
Engine coolant temperature sensor
Mass air flow sensor
Amount of intake air
Engine speed rpm
Heated oxygen sensor 2 heater
Above 4,000
OFF
●
Below 4,000 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: Below 4,000 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
●
Engine speed: Above 4,000 rpm
OFF
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0037
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
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
EC-132
[KA24DE]
DTC P0037, P0038 HO2S2 HEATER
DTC Confirmation Procedure
UBS00D27
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is in between 10.5V at idle.
WITH CONSULT-II
1.
Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
2.
Start engine and warm it up to the normal operating tempera-
ture.
3.
Turn ignition switch OFF and wait at least 10 seconds.
4.
Start engine and keep the engine speed between 3,500 and
4,000 rpm for at least 1 minute under no load.
5.
Let engine idle for 1 minute.
6.
If 1st trip DTC is detected, go to
EC-134, "Diagnostic Procedure"
.
WITH GST
1.
Start engine and warm it up to the normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4.
Let engine idle for 1 minute.
5.
Turn ignition switch OFF and wait at least 10 seconds.
6.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
7.
Let engine idle for 1 minute.
8.
Select “MODE 3” with GST.
9.
If DTC is detected, go to
EC-134, "Diagnostic Procedure"
When using GST, “DTC Confirmation Procedure” should be performed twice as much as when using
CONSULT-II because GST cannot display MODE 7 (1st trip DTC) concerning this diagnosis. Therefore,
using CONSULT-II is recommended.
SEF174Y
DTC P0037, P0038 HO2S2 HEATER
EC-133
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EC
Wiring Diagram
UBS00D28
BBWA1058E
EC-134
[KA24DE]
DTC P0037, P0038 HO2S2 HEATER
Specification data are reference values and are measured between each terminal 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.
Diagnostic Procedure
UBS00D29
1.
CHECK POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect heated oxygen sensor 2 harness connector.
3.
Turn ignition switch ON.
4.
Check voltage between terminal 2 and ground.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
●
Fuse block (J/B) connector M26
●
15A fuse
●
Harness for open or short between heated oxygen sensor 2 and 15A fuse
>> Repair harness or connectors.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
122
R/B
Heated oxygen sensor 2
heater
[Engine is running]
●
Warm-up condition
●
Engine speed: Below 4,000 rpm after the follow-
ing conditions are met.
●
Keeping the engine speed between 3,500 and
4,000 rpm for 1 minute and at idle for 1 minute
under no load
0 - 1.0V
[Ignition switch: ON]
●
Engine stopped
[Engine is running]
●
Engine speed is above 4,000 rpm.
BATTERY VOLTAGE
(11 - 14V)
Voltage
: Battery voltage
SEF218W
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