Subaru IMPREZA GD 2007 Series Manual page 114

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3. General Description
A: CAUTION
1) Airbag system wiring harness is routed near the
ECM, main relay and fuel pump relay.
CAUTION:
• Airbag system wiring harnesses and connec-
tors are yellow. Do not use electrical test equip-
ment on these circuits.
• Be careful not to damage the airbag system
wiring harness when servicing the ECM, TCM,
main relay and fuel pump relay.
2) Never connect the battery in reverse polarity. Fail-
ure to do so will damage the ECM instantly, and the
fuel injector and other parts will also be damaged.
3) Do not disconnect the battery terminals while the
engine is running. A large counter electromotive
force will be generated in the generator, and this volt-
age may damage electronic parts such as ECM etc.
4) Before disconnecting the connectors of each
sensor and ECM, be sure to turn the ignition switch
to OFF. Perform the Clear Memory Mode after con-
necting the connectors. <Ref. to EN(H4SO)(diag)-
47, Clear Memory Mode.>
5) Measure the voltage or resistance of individual
sensor or all electrical control modules using a ta-
pered pin with a diameter of less than 0.6 mm
(0.024 in). Do not insert the pin 4 mm (0.16 in) or
more into the part.
CAUTION:
When replacing the ECM, be careful not to use
the wrong spec. ECM to avoid any damage on
the fuel injection system.
6) Connectors of each sensor in the engine com-
partment and the harness connectors on the en-
gine side and body side are all designed to be
waterproof. Even if the connectors are waterproof,
take care not to allow water to get into them when
washing the vehicle, or when servicing the vehicle
in rainy weather.
7) Use ECM mounting stud bolts at the body side
grounding point when measuring voltage and resis-
tance inside the passenger compartment.
(A) Stud bolt
General Description
8) Use the engine ground terminal or engine as-
sembly as a grounding point to chassis when mea-
suring the voltage and resistance in engine
compartment.
9) Every MFI-related part is a precision part. Do not
drop them.
10) Observe the following cautions when installing
a radio in MFI equipped models.
CAUTION:
• The antenna must be kept as far apart as pos-
sible from control unit.
• The antenna feeder must be placed as far
apart as possible from the ECM and MFI har-
ness.
• Carefully adjust the antenna for correct
matching.
• When mounting a large power type radio, pay
special attention to the three items mentioned
above.
• Incorrect installation of the radio may affect
the operation of ECM.
11) Release the fuel pressure before disconnecting
the fuel hose. <Ref. to FU(H4SO)-43, RELEASING
OF FUEL PRESSURE, PROCEDURE, Fuel.>
12) For the model with ABS, the ABS warning light
may illuminate when performing driving test with
jacked-up or lifted-up condition, but this is not a
system malfunction. The reason for this is the
speed difference between the front and rear
wheels. When diagnosis of engine control system
is finished, perform the ABS memory clearance
procedure of self-diagnosis system.
(A)
EN-00001
EN(H4SO)(diag)-5
ENGINE (DIAGNOSTICS)
FU-01090