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15 CHECK HEATED OXYGEN SENSOR 1 (FRONT) SIGNAL
With CONSULT-II
1. Replace heated oxygen sensor 1 (front).
2. See “HO2S1 MNTR (B1)” in “DATA MONITOR” mode.
3. Maintain engine at 2,000 rpm under no-load (engine is warmed up to normal operating temperature.). Check that the
monitor fluctuates between “LEAN” and “RICH” more than five times during 10 seconds.
1 cycle: RICH → LEAN → RICH
2 cycles: RICH → LEAN → RICH → LEAN → RICH
Without CONSULT-II
1. Stop engine.
2. Replace heated oxygen sensor 1 (front).
3. Start engine and warm it up to normal operating temperature.
4. Run engine at approx. 2,000 rpm for approx. 2 minutes under no-load.
5. Set voltmeter probe between ECM terminal 50 and ground.
6. Make sure that voltage fluctuates between 0 - 0.3V and 0.6 - 1.0V more than 5 times during 10 seconds at 2,000 rpm.
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
OK or NG
OK 䊳 GO TO 12.
NG 䊳 GO TO 16.
16 DETECT MALFUNCTIONING PART
1. Connect heated oxygen sensor 1 (front) harness connector to heated oxygen sensor 1 (front).
2. Check fuel pressure regulator. Refer to EC-52.
3. Check mass air flow sensor and its circuit.
Refer to EC-150.
4. Check injector and its circuit.
Refer to EC-567.
Clean or replace if necessary.
5. Check engine coolant temperature sensor and its circuit. Refer to EC-168, 187.
6. Check ECM function by substituting another known-good ECM.
(ECM may be the cause of a problem, but this is rarely the case.)
䊳 GO TO 12.
쐌 If a vehicle contains a part which is operating outside of design specifications with no MIL
illumination, the part shall not be replaced prior to emission testing unless it is determined that
the part has been tampered with or abused in such a way that the diagnostic system cannot rea-
sonably be expected to detect the resulting malfunction.
BASIC SERVICE PROCEDURE
KA24DE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
EC-66
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