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3 CHECK HO2S2 (REAR) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check heated oxygen sensor 2 (rear) harness protector color.
SEF372Z
3. Disconnect corresponding heated oxygen sensor 2 (rear) harness connector.
WEC546
4. Disconnect ECM harness connector.
5. Check harness continuity between ECM terminal and HO2S2 (rear) terminal as follows.
Refer to Wiring Diagram.
SEF826Z
Continuity should exist.
6. Check harness continuity between ECM terminal or HO2S2 (rear) terminal and ground as follows.
Refer to Wiring Diagram.
SEF827Z
Continuity should not exist.
7. Also check harness for short to power.
OK or NG
DTC P0139, P0159 HEATED OXYGEN SENSOR 2 (REAR)
(BANK 1)/(BANK 2) (RESPONSE MONITORING)
VG33E
Diagnostic Procedure (Cont’d)
EC-862
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