Nissan Frontier D22. Instruction — part 333
DTC P1147 HO2S2
EC-435
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
5.
Set voltmeter probes between ECM terminals 56 (Heated oxy-
gen sensor 2 signal) and engine ground.
6.
Check the voltage when revving engine up to 4,000 rpm under
no load at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
The voltage should be above 0.68V at least once during this
procedure.
If the voltage can be confirmed in step 4, step 5 is not nec-
essary.
7.
Keep vehicle at idling for 10 minutes, then check the voltage. Or
check the voltage when coasting from 80 km/h (50 MPH) in 3rd
gear position (M/T), D position with “OD” OFF (A/T).
The voltage should be above 0.68V at least once during this procedure.
8.
If NG, go to
EC-437, "Diagnostic Procedure"
AEC874A
EC-436
[KA24DE]
DTC P1147 HO2S2
Wiring Diagram
UBS00DAF
BBWA1057E
DTC P1147 HO2S2
EC-437
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
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
UBS00DAG
1.
RETIGHTEN GROUND SCREWS
1.
Turn ignition switch OFF.
2.
Loosen and retighten engine ground screws.
>> GO TO 2.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
56
OR
Heated oxygen sensor 2
[Engine is running]
●
Warm-up condition
●
Revving engine from idle up to 3,000 rpm
quickly after the following 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 - Approximately 1.0V
SEF325V
EC-438
[KA24DE]
DTC P1147 HO2S2
2.
CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-II.
3.
Clear the self-learning control coefficient by touching “CLEAR”.
4.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 detected?
Is it difficult to start engine?
Without CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF.
3.
Disconnect mass air flow sensor harness connector, and restart
and run engine for at least 3 seconds at idle speed.
4.
Stop engine and reconnect mass air flow sensor harness con-
nector.
5.
Make sure DTC P0102 is displayed.
6.
Erase the DTC memory. Refer to
EMISSION-RELATED DIAGNOSTIC INFORMATION"
.
7.
Make sure DTC P0000 is displayed.
8.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 detected?
Is it difficult to start engine?
Yes or No
Yes
>> Perform trouble diagnosis for DTC P0171. Refer
No
>> GO TO 3.
3.
CHECK INPUT SIGNAL CIRCUIT
1.
Disconnect heated oxygen sensor 2 harness connector and ECM harness connector.
2.
Check harness continuity between ECM terminal 56 and HO2S2 terminal 1.
Refer to Wiring Diagram.
3.
Check harness continuity between ECM terminal 56 or HO2S2 terminal 1 and ground.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
SEF215Z
AEC131A
Continuity should exist.
Continuity should not exist.
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