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3 CHECK HO2S1 (FRONT) OUTPUT SINGAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal and HO2S1 (front) terminal as follows.
Refer to Wiring Diagram.
MTBL0613
Continuity should exist.
4. Also check harness for short to ground and 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.
4 CHECK HEATED OXYGEN SENSOR 1 HEATER (FRONT)
Check resistance between HO2S1 (front) terminals as follows.
SEF310X
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.
DTC P0135 (BANK 1), P0155 (BANK 2) HO2S1 HEATER (FRONT)
Diagnostic Procedure (Cont’d)
EC-244
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