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31 REPLACE HEATED OXYGEN SENSOR 1
1. Stop engine.
2. Replace heated oxygen sensor 1 on the malfunctioning bank.
With CONSULT-II © GO TO 32.
Without CONSULT-II © GO TO 33.
32 CHECK HEATED OXYGEN SENSOR 1 (BANK 1)/(BANK 2) SIGNAL
With CONSULT-II
1. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
2. See “HO2S1 MNTR (B1)/(B2)” in “DATA MONITOR” mode.
3. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that
the monitor fluctuates between LEAN and RICH more than 5 times during 10 seconds.
1 time: RICH → LEAN → RICH
2 times: RICH → LEAN → RICH → LEAN → RICH
OK or NG
OK © GO TO 4.
NG © GO TO 34.
33 CHECK HEATED OXYGEN SENSOR 1 (BANK 1)/(BANK 2) SIGNAL
Without CONSULT-II
1. Set ECM to Self-diagnostic mode II (Heated oxygen sensor 1 monitor). Refer to “How to Switch Diagnostic Test Mode”,
EC-94.
2. Switch the monitored sensor to the malfunctioning bank. Refer to “How to Switch Monitored Sensor from Bank 1 to
Bank 2 or Vice Versa”, EC-94.
3. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that
the MIL comes on more than 5 times during 10 seconds.
OK or NG
OK © GO TO 4.
NG © GO TO 34.
34 DETECT MALFUNCTIONING PART
Check the following.
I Check mass air flow sensor and its circuit, and repair or replace if necessary. Refer to EC-195.
I Check injector and its circuit, and repair or replace if necessary. Refer to EC-703.
I Check engine coolant temperature sensor and its circuit, and repair or replace if necessary. Refer to EC-207.
I Check fuel pressure and repair or replace if necessary. Refer to EC-56.
OK or NG
OK © GO TO 36.
NG © 1. Repair or replace.
2. GO TO 35.
35 ERASE UNNECESSARY DTC
After this inspection, unnecessary DTC might be displayed.
Erase the stored memory in ECM and TCM. Refer to “How to Erase Emission-related Diagnostic Information”, EC-76 and
AT-38.
© GO TO 4.
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
EC-70
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