Section 08 ENGINE MANAGEMENT (4-TEC)
Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
If resistance value is incorrect, repair the wiring
harness/connectors or replace the wiring harness
between ECM connector and fuel injector.
Fuel Injector Replacement
Removal
Before removing the injectors, the fuel rail has to
be removed from the engine. Refer to REMOVAL
in FUEL RAIL REPLACEMENT for the procedure.
1
2
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3
FUEL RAIL ASS'Y
1. Fuel injector
2. Injector clip
3. O-ring
Then remove the injector clip. Now the fuel injec-
tor can be easily pulled out of the fuel rail.
Installation
For the installation, reverse the removal proce-
dure. Paying attention to the following details.
If you reinstall a used injector, carefully inspect
O-ring condition before reinstalling fuel injector.
ReplaceO-ringwithanewoneifdamaged. In-
sert the fuel injector in place with your hand.
NOTE: A thin film of engine oil should be applied
to O-rings to ease insertion in rail.
Apply Loctite 243 on rail retaining screws then
torque to 10 N•m(89lbf•in).
WARNING
Perform a fuel pressure test and ensure that
there is no leak. Refer to FUEL PUMP above.
Run engine and check for leaks.
ELECTRONIC MANAGEMENT
ECM AND MPEM REPLACEMENT
General
Prior to replacing a suspected ECM or MPEM, en-
sure that all the recommendations in the general
introduction of this section have been followed.
IMPORTANT: When the ECM is replaced, the
Closed Throttle and Idle Actuator must be re-
set. Refer to its specific section for adjustment.
To allow transferring the previous recorded infor-
mation from the old ECM or MPEM to the new
one, use the vehicle communication kit (VCK)
with the B.U.D.S. software. Use Replace ECM
or MPEM in the Module menu. Follows instruc-
tions in its help system.
NOTE: If the old ECM or MPEM is working, it
must be read inside B.U.D.S. prior to removing it
from the vehicle to carry vehicle information and
history to the new ECM or MPEM. Otherwise, per-
form the operations described in IF THE PREVI-
OUS MPEM WAS NOT READ with B.U.D.S. be-
low.
ECM Replacement
CAUTION: Never try to use a 4-TEC Super-
charged ECM on a naturally-aspirated engine.
Doing so will automatically lead to a misfunc-
tion of the Electronic Management System
(EMS) and will cause irregular combustion
which will damage the engine. Always make
sure to replace the ECM by an appropriate unit.
Disconnect battery cables.
WARNING
Battery BLACK negative cable must always be
disconnected first and connected last.
Disconnect both ECM connectors from ECM.
smr2004-Complete Line Up 417
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