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2 CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal and HO2S2 terminal as follows.
Refer to Wiring Diagram.
MTBL1150
Continuity should exist.
2. Check harness continuity between ECM terminal or HO2S2 terminal and ground as follows.
Refer to Wiring Diagram.
MTBL1151
Continuity should not exist.
3. Also check harness for short to power.
OK or NG
OK © GO TO 3.
NG © Repair open circuit or short to ground or short to power in harness or connectors.
3 CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between HO2S2 terminal 4 and engine ground.
Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to power.
OK or NG
OK © GO TO 5.
NG © GO TO 4.
4 DETECT MALFUNCTIONING PART
Check the following.
I Joint connector-18
I Harness for open and short between HO2S2 and engine ground
© Repair open circuit or short to power in harness or connectors.
5 CHECK HO2S2 CONNECTORS FOR WATER
Check heated oxygen sensor connector 2 and harness connector for water.
Water should not exist.
OK or NG
OK (With CONSULT-II) © GO TO 6.
OK (Without CONSULT-
II)
© GO TO 7.
NG © Repair or replace harness or connectors.
DTC P0138, P0158 HO2S2
Diagnostic Procedure (Cont’d)
EC-254
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