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6 DISCONNECT HO2S1 HARNESS CONNECTOR
1. Turn ignition switch “OFF”.
2. Disconnect corresponding heated oxygen sensor 1 harness connector.
SEC099D
SEC134D
© GO TO 7.
7 CHECK HO2S1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal and HO2S1 terminal as follows.
Refer to Wiring Diagram.
MTBL1146
Continuity should exist.
3. Check harness continuity between ECM terminal or HO2S1 terminal and ground as follows.
Refer to Wiring Diagram.
MTBL1147
Continuity should not exist.
4. Also check harness for short to power.
OK or NG
OK © GO TO 8.
NG © Repair open circuit or short to ground or short to power in harness or connectors.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0133, P0153 HO2S1
Diagnostic Procedure (Cont’d)
EC-235
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