FUEL SYSTEM
On-vehicle Inspection of MPI Components
POWER SUPPLY AND IGNITION SWITCH-IG
Engine control
unit
MPI control relay
switch
Harness side
62
Engine control unit
Engine control unit connector
OPERATION
l
While the ignition switch is on, battery power is supplied to the engine control unit, the injector, the air
flow sensor, etc.
l
When the ignition switch is turned on, the battery voltage is applied from the ignition switch to the engine
control unit, which then turns ON the power transistor to energize the control relay coil. This turns ON the
control relay switch and the power is supplied from the battery to the engine control unit through the
control relay switch.
INSPECTION
Using Multi-use Tester
Function
Item No.
Data display
I
Check condition
I
Standard value
I
Data reading
16
Engine control unit
power voltage
Ignition switch: ON
s
v
TSB Revision
Summary of Contents for 3000GT 1991
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