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Diagnostic Procedure
NHEC0129
1 CHECK HO2S1 (FRONT) POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Check heated oxygen sensor 1 (front) harness protector color.
SEC020C
3. Disconnect corresponding heated oxygen sensor 1 (front) harness connector.
SEF902XA
4. Turn ignition switch “ON”.
5. Check voltage between HO2S1 (front) terminal 2 and ground with CONSULT-II or tester.
SEF311X
OK or NG
OK © GO TO 3.
NG © GO TO 2.
2 DETECT MALFUNCTIONING PART
Check the following.
I Harness connectors M46, F44
I Fuse block (J/B) connector M19
I 15A fuse
I Harness for open or short between heated oxygen sensor 1 (front) and fuse
© Repair harness or connectors.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0135 (BANK 1), P0155 (BANK 2) HO2S1 HEATER (FRONT)
Diagnostic Procedure
EC-243
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