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6 CHECK HO2S1 (FRONT) HARNESS PROTECTOR COLOR
1. Turn ignition switch “OFF”.
2. Check heated oxygen sensor 1 (front) harness protector.
SEC020C
3. Disconnect corresponding heated oxygen sensor 1 (front) harness connector.
SEF902XA
© GO TO 7.
7 CHECK HO2S1 (FRONT) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal and HO2S1 (front) terminal as follows.
Refer to Wiring Diagram.
MTBL0598
Continuity should exist.
3. Check harness continuity between ECM terminal or HO2S1 (front) terminal and ground as follows.
Refer to Wiring Diagram.
MTBL0599
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
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0133 (BANK 1), P0153 (BANK 2) HO2S1 (FRONT) (RESPONSE
MONITORING)
Diagnostic Procedure (Cont’d)
EC-225
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