FUEL SYSTEM On-vehicle Inspection of MPI Components
TROUBLESHOOTING HINTS
Hint 1 If the barometric pressure sensor is faulty, poor driveability is caused at high altitude, in particular.
Hint 2: If the pressure indication of the barometric pressure sensor drops significantly during high speed
driving, check the air cleaner for clogging.
INSPECTION
Using Multi-use Tester
Function
Data reading
Item No. Data display
25
Check condition
Altitude
Standard value
Sensor
pressure
Ignition switch: ON
At 0 m ft.)
760
At 600 m (1,969 ft.)
710
1,200 m (3,937 ft.)
I
At 1,800 m
ft.)
610
HARNESS INSPECTION
I
Check for continuity of the ground
circuit.
l
Connector: Disconnected
Repair the
harness.
q ,
Measure the power supply voltage of
the barometric pressure sensor.
l
Connector: Disconnected
l
Ignition switch: ON
4.8 5.2
Repair the
harness.
Engine
unit harness
side
Check for an open-circuit, or a short-
circuit to ground between the engine
control unit and the barometric pres-
A
sure sensor.
l
Air flow sensor connector:
connected
l
Engine control unit connector:
Disconnected
Repair the
harness.
TSB Revision
Summary of Contents for 3000GT 1991
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