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3 CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check heated oxygen sensor 2 harness protector color.
SEF372ZB
3. Disconnect corresponding heated oxygen sensor 2 harness connector.
SEC134D
4. Disconnect ECM harness connector.
5. Check harness continuity between ECM terminal and HO2S2 terminal as follows.
Refer to Wiring Diagram.
MTBL1161
Continuity should exist.
6. Check harness continuity between ECM terminal or HO2S2 terminal and ground as follows.
Refer to Wiring Diagram.
MTBL1162
Continuity should not exist.
7. Also check harness for 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 P1146, P1166 HO2S2
Diagnostic Procedure (Cont’d)
EC-512
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