Mitsubishi 3000GT Service Manual page 244

MULTIPORT On-Vehicle Inspection of MFI
FUEL INJECTION - Components
SENSOR INSPECTION
(1) Disconnect the heated oxygen sensor connector.
(2) Check that there is continuity [approx. 20 fiat 20°C (SS'F)]
across terminals (3) and (4) of the heated oxygen sensor LJ
connector.
(3) If there is no continuity, replace the heated oxygen sensor.
(4) Warm up the engine until the engine coolant temperature
becomes 80°C (176°F) or higher.
(5) Using jumper wires, connect terminals (3) and (4) of the
heated oxygen sensor connector to battery (+) and (-)
terminals respectively.
Caution
Ensure that the jumper wires are connected correctly,
as wrong connections result in a broken heated oxy-
gen sensor.
(6) Connect a digital voltmeter across terminals (1) and (2).
(7) Racing the engine repeatedly and measure the output
voltage of the heated oxygen sensor.
Engine
When engine is
NOTE
For removal and installation of the heated oxygen sensor,
refer to GROUP 15 - Exhaust Manifold.
TSB Revision
Heated oxygen
Remarks
sensor output
voltage
When the air-fuel mixture
becomes richer as a result
of repeated racing, the
heated oxygen sensor
should output a voltage of