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On Board Diagnosis Logic
NGEC0647
Malfunction is detected when the current amperage in the heated
oxygen sensor 1 heater (front) circuit is out of the normal range.
[An improper voltage drop signal is sent to ECM through the heated
oxygen sensor 1 heater (front).]
POSSIBLE CAUSE
NGEC0647S01
쐌 Harness or connectors
[The heated oxygen sensor 1 heater (front) circuit is open or
shorted.]
쐌 Heated oxygen sensor 1 heater (front)
SEF058Y
DTC Confirmation Procedure
NGEC0648
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:
Before performing the following procedure, confirm that bat-
tery voltage is between 10.5V and 16V at idle.
With CONSULT-II
1) Turn ignition switch ON and select “DATA MONITOR” mode
with CONSULT-II.
2) Start engine and run it for at least 6 seconds at idle speed.
3) If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-833.
With GST
1) Start engine and run it for at least 6 seconds at idle speed.
2) Turn ignition switch OFF, wait at least 5 seconds and then turn
ON.
3) Start engine and run it for at 6 seconds at idle speed.
4) Select “MODE 3” with GST.
5) If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-833.
쐌 When using GST, “DTC Confirmation Procedure” should
be performed twice as much as when using CONSULT-II
because GST cannot display MODE 7 (1st trip DTC) con-
cerning this diagnosis. Therefore, using CONSULT-II is
recommended.
DTC P0135, P0155 HEATED OXYGEN SENSOR 1 HEATER
(FRONT) (BANK 1)/(BANK 2)
VG33E
On Board Diagnosis Logic
EC-830
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