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On Board Diagnosis Logic
NHEC0282
★ The closed loop control has the one trip detection logic.
Malfunction is detected when the closed loop control function for
bank 1 does not operate even when vehicle is driving in the speci-
fied condition, the closed loop control function for bank 2 does not
operate even when vehicle is driving in the specified condition.
Possible Cause
NHEC0531
I The heated oxygen sensor 1 (front) circuit is open or shorted.
I Heated oxygen sensor 1 (front)
I Heated oxygen sensor 1 (front) heater
DTC Confirmation Procedure
NHEC0283
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
NHEC0283S01
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-477.
DTC P1148 (BANK 1), P1168 (BANK 2) CLOSED LOOP CONTROL
On Board Diagnosis Logic
EC-476
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