Section 07
ENGINE MANAGEMENT (4-TEC)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
SMR2002-078 _07_03A.FM
07-03-31
Connect one test probe to the WHITE/GRAY wire
and the other test probe to the switch top termi-
nal. Measure resistance, it must be close to
0 ohm.
Connect one test probe to the BLACK wire and the
other test probe to the switch ring. Measure resis-
tance, it must be close to 0 ohm.
DESS Auxiliary Module
This module enhances safety lanyard recognition
at the EMS ECU. It is located under steering sup-
port. It is an inline connection of the DESS post
harness.
If a safety lanyard cannot be programmed or it fails
to be recognized, first refer to the basic self diagnos-
tic mode in DIAGNOSTIC PROCEDURES section.
If it still does not work, disconnect the DESS aux-
iliary module and connect the regular 6-pin DESS
harness.
a. If it is now working, check module harness/
connections. Ensure wires from MPEM and
EMS ECU are properly positioned in connector
and match those on auxiliary module side. Refer
to WIRING DIAGRAMS. If harness/connector
are correct, try a new module.
b. Try pushing down and turning the lanyard on its
post. If it is working now, check module harness/
connections and if they are in good condition, try
a new module.
Reconnect module.
If the above procedures did not work, refer to elec-
trical troubleshooting in TROUBLESHOOTING
and ENGINE MANAGEMENT sections.
Safety Lanyard on Switch
Connect test probes to switch BLACK and BLACK/
YELLOW wires. Measure resistance, it must be
close to 0 ohm.
SPARK PLUGS
Disassembly
Disconnect the wiring harness from the ignition
coil.
Remove the ignition coil.
First unscrew the spark plug one turn.
Clean the spark plug and cylinder head with pres-
surize air then completely unscrew.
Spark Plug Installation
Prior to installation make sure that contact surfac-
es of the cylinder head and spark plug are free of
grime.
1. Using a wire feeler gauge, set electrode gap ac-
cording to the following chart.
2. Apply anti-seize lubricant over the spark plug
threads to prevent possible seizure.
3. Hand screw spark plug into cylinder head. Then,
tighten the spark plug clockwise an additional
1/4 turn with a proper socket.
1. Proper socket
2. Improper socket
CRANKING SYSTEM
See above for start/stop switch and the DESS post
testing. Refer to STARTING SYSTEM section for
other tests.
WARNING
Never remove ignition coil from the spark
plug without disconnecting it from the wiring
harness. Flammable vapors may be present
in the bilge and ignited by a spark which
could cause an explosion.
ENGINE
SPARK
PLUG
TORQUE
GAP
mm (in)
1503
4-TEC
NGK
DCPR8-ES
Hand tighten
+ 1/4 turn with
a socket
0.6
(.24)
A00E0BA
2
1
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Summary of Contents for GTX 4-TEC 5573 2002
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