Mitsubishi 3000GT Service Manual page 132

MULTIPORT FUEL INJECTION
oxygen sensor
Range of Check
3 minutes have passed after engine was started.
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Engine coolant temperature is approx. 80% (176OF) or more.
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Intake air temperature is 20-50°C (68-122°F).
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Engine speed is approx. 1,900-2,200 r/min.
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Vehicle is moving at constant speed on a flat, level road surface.
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tput voltage does not cross specified voltage
Range of Check
The throttle position sensor output voltage is 1.15 V or less.
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Actuator test by scan tool is not carried out.
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Set Conditions
Surge voltage of injector coil is not detected for 4 seconds.
TSB Revision
Probable causes
xygen sensor deteriorated.
or shorted oxygen
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Incorrect fuel pressure.
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Injector failed.
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Engine control module failed.
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Probable causes
I module failed.