Mitsubishi 3000GT Service Manual page 242

TROUBLESHOOTING HINTS
Hint 1: Poor cleaning of exhaust gas will result if the heated oxygen sensor fails.
Hint 2: If the heated oxygen sensor checked good but the sensor output voltage is out of specification,
troubles of parts related to air-fuel ratio control system are suspected.
[Examples]
(1) Faulty injector
(2) Air leaking into the intake manifold through gasket gap, etc.
(3) Faulty volume air flow sensor, intake air temperature sensor, barometric pressure sensor, engine
coolant temperature sensor
INSPECTION
Using Scan Tool
I
Function Item No. ) Data display
Data reading
11
MULTIPORT On-Vehicle Inspection of MFI
FUEL INJECTION - Components
Sensor
voltage
the heated oxygen se
sor signal, check the air/
fuel mixture ratio, and
also check the condition
of control by the engine
control module)
TSB
Revision