Nissan Frontier D22. Manual - part 632
DTC P1148, P1168 CLOSED LOOP CONTROL
EC-1631
[VG33ER]
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EC
DTC P1148, P1168 CLOSED LOOP CONTROL
PFP:22690
On Board Diagnosis Logic
UBS00E0K
These self-diagnoses have the one trip detection logic.
DTC Confirmation Procedure
UBS00E0L
CAUTION:
Always drive vehicle at a safe speed.
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:
●
Never raise engine speed above 2,800 rpm during the DTC Confirmation Procedure. If the engine
speed limit is exceeded, retry the procedure from step 2.
●
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Hold engine speed at 2,000 rpm and check one of the following.
–
“HO2S1 (B1)/(B2)” voltage should go above 0.70V at least once.
–
“HO2S1 (B1)/(B2)” voltage should go below 0.21V at least once.
If the check result is NG, perform
If the check result is OK, perform the following step.
4.
Let engine idle at least 5 minutes.
5.
Maintain the following condition at least 50 consecutive sec-
onds.
During this test, P0134 and/or P0154 may be displayed on CONSULT-II screen.
6.
If DTC is detected, go to
EC-1632, "Diagnostic Procedure"
Overall Function Check
UBS00E0M
Use this procedure to check the overall function of the closed loop control. During this check, a DTC might not
be confirmed.
WITH GST
1.
Start engine and warm it up to normal operating temperature.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1148
(Bank 1)
Closed loop control
function
The closed loop control function for bank 1
does not operate even when vehicle is driving
in the specified condition.
●
The heated oxygen sensor 1 circuit is
open or shorted.
●
Heated oxygen sensor 1
●
Heated oxygen sensor heater
P1168
(Bank 2)
The closed loop control function for bank 2
does not operate even when vehicle is driving
in the specified condition.
B/FUEL SCHDL
2.0 msec or more
ENG SPEED
1,500 rpm or more
Selector lever
Suitable position
VHCL SPEED SE
More than 70 km/h (43 MPH)
SEF967Y