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2 CHECK HO2S1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal and HO2S1 terminal as follows.
Refer to Wiring Diagram.
MTBL1148
Continuity should exist.
3. Check harness continuity between ECM terminal or HO2S1 terminal and ground as follows.
Refer to Wiring Diagram.
MTBL1149
Continuity should not exist.
4. Also check harness for short to power.
OK or NG
OK (With CONSULT-II) © GO TO 3.
OK (Without CONSULT-
II)
© GO TO 4.
NG © Repair open circuit or short to ground or short to power in harness or connectors.
DTC P0134, P0154 HO2S1
Diagnostic Procedure (Cont’d)
EC-246
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