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25 CHECK HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1) SIGNAL
With CONSULT-II
1. Stop engine.
2. Replace heated oxygen sensor 1 (front) (bank 1).
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. See “HO2S1 MNTR (B1)” in “DATA MONITOR” mode.
6. Maintaining 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 5 times during 10 seconds.
1 time: RICH → LEAN → RICH
2 times: RICH → LEAN → RICH → LEAN → RICH
Without CONSULT-II
1. Stop engine.
2. Replace heated oxygen sensor 1 (front) (bank 1).
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 63 and ground.
6. Make sure that the 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 © INSPECTION END
NG © GO TO 26.
26 DETECT MALFUNCTIONING PART
Check the following.
I Check fuel pressure regulator. Refer to EC-50.
I Check mass air flow sensor and its circuit. Refer to EC-152.
I Check injector and its circuit. Refer to EC-608.
Clean or replace if necessary.
I Check engine coolant temperature sensor and its circuit. Refer to EC-187.
I Check ECM function by substituting another known-good ECM.
(ECM may be the cause of a problem, but this is rarely the case.)
© GO TO 3.
27 CHECK HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1) HARNESS
1. Turn off engine and disconnect battery ground cable.
2. Disconnect ECM harness connector.
3. Disconnect heated oxygen sensor 1 (front) (bank 1) harness connector.
4. Check harness continuity between ECM terminal 63 and heated oxygen sensor 1 (front) (bank 1) harness connector
terminal 1.
Refer to Wiring Diagram, EC-195.
Continuity should exist.
OK or NG
OK © GO TO 30.
NG © GO TO 28.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
EC-63
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