Section 06
ENGINE MANAGEMENT (DI)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
06-03-2
SMR2002-030 _06_03A.FM
CAUTION:
Never use injector cleaning products.
They may contain additive that could damage in-
jector components. A copper wire brush may be
used to clean the tip of the direct injectors if nec-
essary.
To check air/fuel rail for leaks, first pressurize the
system then spray soapy water on all hose con-
nections, 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 replace temporarily
the battery, as it may cause the MPEM to work
erratically or not to work at all. Check related-circuit
fuse solidity and condition with an ohmmeter. Vi-
sual inspection could lead to false results.
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, always check electrical
connections. Make sure that they are very tight and
they make good contact and that they are corrosion-
free. A “defective module” could possibly be re-
paired simply by unplugging and replugging the
MPEM. The voltage and current might be too
weak to go through dirty wire pins. Check carefully
if posts show signs of moisture, corrosion or if
they look dull. Clean pins properly and then coat
them with silicon-based dielectric grease or other
appropriate lubricant (except if otherwise speci-
fied) when reassembling them. If the newly re-
placed MPEM is working, try the old one and re-
check if it works.
Ensure that all electronic components are genu-
ine — particularly in the ignition system. Installing
resistive caps, non-resistive spark plug cables (or
modified length) or non-resistive spark plugs may
lead to generate fault codes or bad operation.
NOTE:
Diagnostics Communication Kit. See DI-
AGNOSTICS section.
After a problem has been solved, ensure to clear
the fault(s) in the MPEM using the VCK. Refer to
DIAGNOSTIC PROCEDURES.
Communication Errors Between
B.U.D.S. and the MPEM
Remember that if there has not been active com-
munication between B.U.D.S. and the MPEM for
more than 10 minutes, the MPEM automatically
shuts down. This causes false “communication
errors”. This occurs quite frequently and confuses
many technicians. Whenever this occurs, simply
remove and replace the lanyard to restart the
MPEM. In fact, one should get into the habit of
resetting the MPEM with the lanyard whenever
the MPEM does not seem to respond. It must be
kept “awake”.
WARNING
Never use a hose pincher on high pressure
hoses.
WARNING
All electrical actuators (injectors, fuel pump,
RAVE solenoid, ignition coil and starter sole-
noid) are permanently connected to the bat-
tery positive terminal, even when the safety
lanyard is removed. 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 GTI 5558
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