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Section 07
ENGINE MANAGEMENT (4-TEC)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
SMR2002-078 _07_03A.FM
07-03-29
IGNITION COILS
1. Ignition coil
NOTE:
The MPEM energizes the primary side of
each ignition coil individually. It can detect open
and short circuit in the primary winding but it does
not check the secondary winding.
Using the vehicle communication kit (VCK) with
the B.U.D.S. software, energize the ignition coil
from the
Activation
section.
You should hear the spark occurring. In doubt, use an
inductive spark tester or a sealed tester – available
from after-market tool/equipment suppliers – to pre-
vent spark occurring in the bilge. Otherwise, perform
the following checks.
An ignition coil with good resistance measure-
ment can still be faulty. Voltage leak can occur at
high voltage level which is not detectable with an
ohmmeter. Replacing the ignition coil may be nec-
essary as a test.
Voltage Test
Disconnect the plug connector from the ignition
coil and check the voltage supplied by the MPEM.
Install safety lanyard on the DESS post.
Check voltage between terminal 2 of ignition coil
connector on the wiring harness and battery
ground.
The voltage should be 12 V.
If 12 V is NOT read, check continuity of appropri-
ate circuit 2-16 (cylinder 1), 2-17 (cylinder 2) or 2-18
(cylinder 3). If it tests good, try a new MPEM.
If 12 V is read, disconnect the EMS ECU connector
A from the EMS ECU and check the continuity of
appropriate circuit 41 (cylinder 1), 1 (cylinder 2) or
29 (cylinder 3).
EMS ECU CONNECTOR
If wiring harness is defective, repair the connector
or replace the wiring harness between EMS ECU
connector and the ignition coil.
If wiring harness is good, test resistance of prima-
ry and secondary winding of ignition coil.
Resistance Test
CAUTION:
Do not remove the ignition coil be-
fore disconnecting the connector, or the wires
will be damaged. Do not pry up ignition coil
with a screwdriver to avoid damage.
WARNING
Never make a spark test with spark plug re-
moved. Flammable vapors may be present in
the bilge and ignited which could cause an ex-
plosion.
WARNING
When disconnecting coil from spark plug, al-
ways disconnect coil from main harness first.
Never check for engine ignition spark from an
open coil and/or spark plug in the engine
compartment as spark may cause fuel vapor
to ignite.
1
R1503motr175A
R1503motr196A
2
1
R1503motr190A
1
41
29
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Summary of Contents for GTX 4-TEC 5573 2002
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