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5 CHECK HEATED OXYGEN SENSOR 1 (FRONT)
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal 50 [Heated oxygen sensor 1 (front) signal] and engine ground.
AEC873A
3. Check the following with engine speed held at 2,000 rpm constant under no load.
쐌 The voltage fluctuates between 0 to 0.3V and 0.6 to 1.0V more than five times within 10 seconds.
1 time: 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V
2 times: 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V
쐌 The maximum voltage is over 0.6V at least one time.
쐌 The minimum voltage is below 0.3V at least one time.
쐌 The voltage never exceeds 1.0V.
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 䊳 GO TO 6.
NG 䊳 Replace heated oxygen sensor 1 (front).
6 CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-142.
Refer to “Wiring Diagram”, EC-196, for circuit.
䊳 INSPECTION END
DTC P0131 HEATED OXYGEN SENSOR 1 (FRONT)
(LEAN SHIFT MONITORING)
KA24DE
Diagnostic Procedure (Cont’d)
EC-206
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