MPI <4G6> -
Troubleshooting
13A-81
CHECK AT THE ENGINE-ECU TERMINALS
TERMINAL VOLTAGE CHECK CHART
1. Connect a needle-nosed wire probe (test harness:
MB991223 or paper clip) to a voltmeter probe.
2. Insert the needle-nosed wire probe into each of the
engine-ECU
<M/T>
or
engine-A/T
-ECU
<A/T>
connector
terminals from the wire side, and measure the voltage
while referring to the check chart.
NOTE
(1) Make the voltage measurement with the engine-ECU
<M/T>
or
engine-A/T
-ECU
<A/T>
connectors
connected.
(2) You may find it convenient to pull out the engine-ECU
<M/T>
or
engine-A/T
-ECU
<A/T>
to
make
it
easier
to reach the connector terminals.
(3) The checks can be carried out off the order given
in the chart.
Caution
Short-circuiting the positive (+) probe between a
connector terminal and earth could damage the
vehicle wiring, the sensor, engine-ECU <M/T> or
engine-A/T
-ECU
<A/T>
or
all
of
them.
Be
careful
to
prevent this!
3. If voltmeter shows any division from standard value, check
the corresponding sensor, actuator and related electrical
wiring, then repair or replace.
4. After repair or replacement, recheck with the voltmeter
to confirm that the repair has corrected the problem.
Needle-nosed wire probe
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