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On Board Diagnosis Logic
NGEC0307
★ The closed loop control has the one trip detection logic.
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P1148 쐌 The closed loop control function does not operate even
when vehicle is driving in the specified condition.
쐌 The heated oxygen sensor 1 (front) circuit is
open or shorted.
쐌 Heated oxygen sensor 1 (front)
쐌 Heated oxygen sensor 1 heater (front)
SEF682Y
DTC Confirmation Procedure
NGEC0308
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:
쐌 Never raise engine speed above 3,000 rpm during the
“DTC Confirmation Procedure”. If the engine speed limit is
exceeded, retry the procedure from step 4.
쐌 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 the following.
쐌 “HO2S1 (B1)” voltage should go above 0.70V at least once.
쐌 “HO2S1 (B1)” voltage should go below 0.21V at least once.
If the result is NG, perform “Diagnosis Procedure”, EC-445.
If the result is OK, perform the following step.
4) Let engine idle at least 3 minutes.
5) Maintain the following condition at least 50 consecutive sec-
onds.
B/FUEL SCHDL 4 msec or more
ENG SPEED 1,800 - 3,000 rpm
Selector lever Suitable position
VHCL SPEED SE More than 70 km/h (43 MPH)
During this test, P0130 DTC may be displayed on CON-
SULT-II screen.
6) If DTC is detected, go to “Diagnostic Procedure”, EC-445.
DTC P1148 CLOSED LOOP CONTROL
KA24DE
On Board Diagnosis Logic
EC-444
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