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19 CHECK “CO” %
1. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
SEF976U
2. Rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed.
SEF978U
3. Check “CO” %.
Idle CO: 1.5 - 9.5%
4.
Without CONSULT-II
After checking CO%,
a. Disconnect the resistor from terminals of engine coolant temperature sensor.
b. Connect engine coolant temperature sensor harness connector to engine coolant temperature sensor.
OK or NG
OK 䊳 1. Replace front heated oxygen sensor LH.
2. GO TO 10.
NG 䊳 GO TO 20.
20 DETECT MALFUNCTIONING PART
Check the following.
1. Connect front heated oxygen sensor harness connectors to front heated oxygen sensors.
2. Check fuel pressure regulator. Refer to EC-638.
3. Check mass air flow sensor and its circuit. Refer to EC-739.
4. Check injector and its circuit. Refer to EC-1169.
Clean or replace if necessary.
5. Check engine coolant temperature sensor and its circuit. Refer to EC-773.
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 2.
BASIC SERVICE PROCEDURE
VG33E
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
EC-652
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