Section 08
ENGINE MANAGEMENT (4-TEC)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
SMR2003_027 _08_03A.FM
08-03-13
4-TEC Models
The resistance should be between 11.4 and 12.6
Ω
.
If resistance value is correct, try a new EMS ECU.
Refer to EMS ECU REPLACEMENT procedures
elsewhere in this section.
If resistance value is incorrect, repair the wiring
harness/connectors or replace the wiring harness
between EMS ECU connector and fuel injector.
4-TEC Supercharged Models
The resistance should be between 14 and 15
Ω
.
If resistance value is correct, try a new EMS ECU.
Refer to EMS ECU REPLACEMENT procedures
elsewhere in this section.
If resistance value is incorrect, repair the wiring
harness/connectors or replace the wiring harness
between EMS ECU 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.
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. Re-
place O-ring with a new one if damaged. Insert 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 (89 lbf•
in
).
ELECTRONIC MANAGEMENT
EMS ECU AND MPEM
REPLACEMENT
General
Prior to replacing a suspected EMS ECU or MPEM,
ensure that all the recommendations in the general
introduction of this section have been followed.
IMPORTANT:
When the EMS ECU is replaced,
the
Closed Throttle and Idle Actuator
must be
reprogrammed/reset. Refer to its specific section
for adjustment.
To allow transferring the previous recorded informa-
tion from the old EMS ECU 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 instructions in its help
system.
NOTE:
If the old EMS ECU 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 his-
tory to the new EMS ECU or MPEM. Otherwise,
perform the operations described in IF THE PREVI-
OUS MPEM WAS NOT READ WITH B.U.D.S. be-
low.
EMS ECU Replacement
CAUTION:
Never try to use a 4-TEC Super-
charged EMS ECU on a normally-aspirated en-
gine. Doing so will automatically lead to a mis-
function of the EMS and will cause irregular
combustion which will damage the engine.
Disconnect battery cables.
1
2
R1503motr164A
3
WARNING
Perform a fuel pressure test and ensure that
there is no leak. Refer to FUEL PUMP above.
Run engine and check for leaks.
WARNING
Battery BLACK negative cable must always
be disconnected first and connected last.
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