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Section 07
ENGINE MANAGEMENT (4-TEC)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
07-03-2
SMR2002-078 _07_03A.FM
To check fuel rail for leaks, first pressurize the sys-
tem then spray soapy water on all hose connec-
tions, regulators and injectors. Air bubbles will
show the leaking area. Check also for leaking fuel
or fuel odor.
ELECTRICAL SYSTEM
It is important to check that the electrical system
is functioning properly:
– battery
– fuses
– DESS
– ignition (spark)
– ground connections
– wiring connectors.
It is possible that a component seems to operate
in static condition but in fact, it is defective. In this
case, the best way to solve this problem is to re-
move the original part and replace it with one
which is in good condition.
Never use a battery charger to substitute tempo-
rarily the battery, as it may cause the MPEM/EMS
ECU to work erratically or not to work at all. Check
related-circuit fuse solidity and condition with an
ohmmeter. Visual inspection could lead to false re-
sults.
To perform verifications, a good quality multimeter
such as Fluke 111 (P/N 529 035 868) should be
used.
Pay particular attention to ensure that pins are not
out of their connectors or out of shape. The trou-
bleshooting procedures cover problems not re-
sulting from one of these causes.
Before replacing a MPEM or EMS ECU, always
check electrical connections. Make sure that they are
very tight and they make good contact and that they
are corrosion-free. Particularly check MPEM and
EMS ECU ground connections. Ensure that con-
tacts are good and clean. A “defective module”
could possibly be repaired simply by unplugging
and replugging the MPEM or EMS ECU. The volt-
age and current might be too weak to go through
dirty wire pins. Check carefully if pins show signs
of moisture, corrosion or if they look dull. Clean
pins properly and then coat them prior to assem-
bling as follows:
AMP connectors, EMS ECU connectors, OPS
and OSPS connectors:
Apply a thin coat of DEOX-
IT contact lubricant (P/N 293 550 015)
Other connectors:
Apply a silicon-based dielectric
grease or other appropriate lubricant. If the newly
replaced MPEM or EMS ECU is working, try the
old one and recheck if it works.
Ensure that all electronic components are genuine
— any modification on the wiring harness may
lead to generate fault codes or bad operation.
NOTE:
For diagnostics purposes, use Vehicle
Communication Kit (VCK). See DIAGNOSTIC
PROCEDURES subsection.
After a problem has been solved, ensure to clear
the fault(s) in the EMS ECU using the VCK. Refer
to DIAGNOSTIC PROCEDURES subsection.
WARNING
Never use a hose pincher on high pressure
hoses.
WARNING
All electrical actuators (idle bypass valve,
TOPS valve, injectors, fuel pump, ignition coils
and starter solenoid) are permanently sup-
plied by the battery when the safety lanyard is
installed. Always disconnect the battery prior
to disconnecting any electric or electronic
parts.
WARNING
Ensure all terminals are properly crimped on
wires and connector housings are properly
fastened.
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Summary of Contents for GTX 4-TEC 5573 2002
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