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6 CHECK INPUT SIGNAL CIRCUIT
1. Disconnect heated oxygen sensor 1 (front) harness connector and ECM harness connector.
2. Check harness continuity between ECM terminal 50 and terminal 2.
SEF141V
Continuity should exist.
3. Check harness continuity between ECM terminal 50 (or terminal 2) and ground.
Continuity should not exist.
4. Also check harness for short to power.
OK or NG
OK 䊳 GO TO 7.
NG 䊳 Repair open circuit or short to ground or short to power in harness or connectors.
7 CHECK HEATED OXYGEN SENSOR 1 HEATER (FRONT)
Check resistance between terminals 3 and 1.
SEF220W
Resistance: 2.3 - 4.3 Ω at 25°C (77°F)
Check continuity between terminals 2 and 1, 3 and 2.
Continuity should not exist.
CAUTION:
쐌 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.
쐌 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.
OK or NG
OK (With CONSULT-II) 䊳 GO TO 8.
OK (Without CONSULT-
II)
䊳 GO TO 9.
NG 䊳 Replace heated oxygen sensor 1 (front).
DTC P0133 HEATED OXYGEN SENSOR 1 (FRONT)
(RESPONSE MONITORING)
KA24DE
Diagnostic Procedure (Cont’d)
EC-220
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