User Manual - Page 349

For 2001 XTERRA.

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Diagnostic Procedure
=NGEC0243
1 CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dent.
OK or NG
OK GO TO 2.
NG Repair or replace.
2 CHECK EXHAUST AIR LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust air leak before three way catalyst.
SEF099P
OK or NG
OK GO TO 3.
NG Repair or replace.
3 CHECK INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK GO TO 4.
NG Repair or replace.
4 CHECK IGNITION TIMING
1. Check the following items. Refer to Basic Inspection, EC-104.
MTBL0328
OK or NG
OK GO TO 5.
NG Adjust ignition timing.
DTC P0420 THREE WAY CATALYST FUNCTION
KA24DE
Diagnostic Procedure
EC-349
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
GI
MA
EM
LC
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