Mitsubishi 1992 3000GT, Service Manual

Page: 287 / 1308

MULTIPORT On-Vehicle Inspection of MFI
FUEL INJECTION
ENGINE CONTROL MODULE (ECM) TERMINAL
VOLTAGES INSPECTION
(1) Connect a very thin wire probe (such as a paper clip)
to the probe of the voltmeter.
(2) Insert the very thin probe from the wire side into contact
with each of the terminals of the ECM connector and
check the voltage, while referring to the check chart.
NOTE
1. Measure a voltage with the ECM connector connected.
2. Measure the voltage between each terminal and the No.
26 terminal (ground terminal).
3. Withdraw the ECM for easier access to the connector
terminals.
4. The inspection need not be performed in the order of
the chart.
Caution
Short-circuiting the positive
probe between a connec-
tor terminal and ground could cause damage to the vehicle
wiring, sensors or ECM, or all of them. Use care to prevent
it!
(3) If the voltmeter shows any deviation from the standard
value, check the corresponding sensor, actuator and re-
lated electrical wiring, then repair or replace.
(4) After repair or replacement, recheck with the voltmeter
to confirm that the problem has cleared completely.
TERMINAL VOLTAGE CHECK CHART
Engine Control Module Connector Terminal Configuration
Terminal No. Check point Check conditions (Engine conditions)
Standard value Remarks
60
12
25
Back-up power supply Ignition switch: OFF
Power supply Ignition switch: ON
62
108
Ignition switch
MFI relay
Ignition switch: ON
Ignition switch: OFF
Ignition switch: ON o-3 v
8 MFI relay
(fuel pump) Ignition switch ON
Engine: Idle
,
o-3 v
61 Sensor impressed
voltage Ignition switch: ON
v
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