Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
161
■
When connecting the ECM harness connectors, push the deflector rod (1) downward mostly to lock
securely.
■
When Inserting the contact pin into the ECM
or pulling it out, be aware to avoid damaging
contact pin port (bent or broken). When
connecting the contact pin, make sure that the
contact pin port of ECM is not bent or
broken.
■
Connect the harness connectors of ECM
firmly. Poor connection may cause extremely
high (fluctuation) voltage on the coil and
capacitor, accordingly resulting in damage of
IC.
■
The harness of the electronic control system of engine should be remained for a length of at least
10cm from the joint in order to avoid any trouble of the electronic control system of engine caused
by receiving the exterior noise signal and decreasing the operation of IC etc.
■
Keep the parts and harness of the electronic control system dry.
■
Inspect ECM with port and reference value to assure the normal function of ECM before replacing.
■
Even the very little leakage in the intake system may lead to the severe trouble.
■
Don’t swing or vibrate the camshaft position sensor (phase) or the crankshaft position sensor
(position).
■
Perform DTC validation procedures or the whole function inspection after conduction of trouble
diagnosis. If repair is finished, DTC should not be seen in the validation procedures. Overall
function inspection should obtain a good result after repair completed.
■
When measuring the ECM with the circuit tester, never make two measuring devices contacted. If
the probes touch occasionally, the short circuit may be cause and the power transistor of ECM may
be damaged.
■
During measurement of input/output voltages, the grounding port must not be used. Otherwise the
transistor of ECM may be damaged. Ports other than the ECM may be used for gounding.
■
Fuel pump must not be used without fuel in pipes.
Fig 4.1.008
Broken
Bent
