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On Board Diagnosis Logic
NFEC1064
★ The closed loop control has the one trip detection logic.
DTC No.
Trouble diagnosis
name
DTC Detecting Condition Possible Cause
P1148
1148
(Bank 1)
P1168
1168
(Bank 2)
Closed loop control The closed loop control function for bank 1 does
not operate even when vehicle is driving in the
specified condition, the closed loop control func-
tion for bank 2 does not operate even when
vehicle is driving in the specified condition.
I The heated oxygen sensor 1 circuit is
open or shorted.
I Heated oxygen sensor 1
I Heated oxygen sensor 1 heater
DTC Confirmation Procedure
NFEC1065
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 10 seconds
before conducting the next test.
TESTING CONDITION:
I Never raise engine speed above 3,600 rpm during the
“DTC Confirmation Procedure”. If the engine speed limit is
exceeded, retry the procedure from step 2.
I Before performing the following procedure, confirm that
battery voltage is more than 11V at idle.
SEC011C
WITH CONSULT-II
NFEC1065S01
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 follow-
ing.
I “HO2S1 (B1)/(B2)” voltage should go above 0.70V at least
once.
I “HO2S1 (B1)/(B2)” voltage should go below 0.21V at least
once.
If the check result is NG, perform “Diagnosis Procedure”,
EC-527.
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.
B/FUEL SCHDL 3.0 msec or more
ENG SPEED 1,800 - 3,000 rpm
Selector lever Suitable position
VHCL SPEED SE More than 70 km/h (43 MPH)
DTC P1148, P1168 CLOSED LOOP CONTROL
On Board Diagnosis Logic
EC-526
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