User Manual - Page 235

For 2001 XTERRA.

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Diagnostic Procedure
NGEC0142
1 CHECK POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 1 (front) harness connector.
SEF331VA
3. Turn ignition switch ON.
4. Check voltage between terminal 1 and ground with CONSULT-II or tester.
SEF213W
Voltage: Battery voltage
OK or NG
OK GO TO 3.
NG GO TO 2.
2 DETECT MALFUNCTIONING PART
Check the following.
Harness connectors M59, F27
15A fuse
Harness for open or short between heated oxygen sensor 1 (front) and 15A fuse
Repair harness or connectors.
3 CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between heated oxygen sensor 1 (front) terminal 3 and ECM terminal 119. Refer to the wiring
diagram.
Continuity should exist.
4. Also check harness for short to ground or short to power.
OK or NG
OK GO TO 4.
NG Repair open circuit or short to ground or short to power in harness or connectors.
DTC P0135 HEATED OXYGEN SENSOR 1 HEATER (FRONT)
KA24DE
Diagnostic Procedure
EC-235
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
GI
MA
EM
LC
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