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3 CHECK HO2S2 (REAR) GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal and HO2S2 (rear) terminal as follows.
Refer to Wiring Diagram.
MTBL0608
Continuity should exist.
4. Also check harness for short to power.
OK or NG
OK © GO TO 4.
NG © Repair open circuit or short to power in harness or connectors.
4 CHECK HEATED OXYGEN SENSOR 2 HEATER (REAR)
Check the resistance between HO2S2 (rear) terminals as follows.
SEF315X
CAUTION:
Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
OK or NG
OK © GO TO 6.
NG © GO TO 5.
5 REPLACE HEATED OXYGEN SENSOR 2 (REAR)
Check heated oxygen sensor 2 (rear) harness protector color.
SEC021C
CAUTION:
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool
J-43897-18 or J-43897-12 and approved anti-seize lubricant.
© Replace malfunctioning heated oxygen sensor 2 (rear).
DTC P0141 (BANK 1), P0161 (BANK 2) HO2S2 HEATER (REAR)
Diagnostic Procedure (Cont’d)
EC-290
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