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Section 07
ENGINE MANAGEMENT (4-TEC)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
07-03-30
SMR2002-078 _07_03A.FM
Remove ignition coil from spark plug.
1. Spark plug terminal
Using a multimeter, check the resistance in both
primary and secondary windings.
For primary winding check the resistance between
pin 1 and pin 2 of the ignition coil.
The resistance should be between 0.85 and
1.15
Ω
at 20°C (68°F).
For secondary winding check the resistance be-
tween pin 1 and spark plug terminal.
The resistance should be between 9.5 and 13.5 k
Ω
at 20°C (68°F).
If the resistance of one of both windings is not
good, replace the defective ignition coil.
If the windings test good, try a new engine EMS
ECU.
NOTE:
Prior to inserting the ignition coil to its lo-
cation, apply some silicone lubricant (P/N 293 600
041) around the seal area that touches the spark
plug hole. After installation, ensure the seal seats
properly with engine top surface.
TDC SETTING (Top Dead Center)
The EMS is able to determine the exact position
of camshaft and crankshaft. That means that no
TDC setting has to be performed. It is used for
both injection and ignition timings.
ENGINE START/STOP SWITCH
VERIFICATION
A quick operation test can be done using the vehi-
cle communication kit (VCK) with the B.U.D.S. soft-
ware, using the
Monitoring
section. Press the
start button and look at the start button LED. It
should turn on, indicating the starting system is
working on the input side of the starting system
(start button, MPEM, EMS ECU and wiring). You
know now the problem is on the output side of the
starting system (MPEM output signal to starting so-
lenoid, wiring harness going to the solenoid and
starter motor. Refer to STARTING SYSTEM for test-
ing procedures). Otherwise, check the input side as
follows.
Disconnect the start/stop switch connector. Using
an ohmmeter, connect test probes to YELLOW/RED
and PURPLE wires.
Measure resistance, it must be an open circuit
(switch is normally open). Depress and hold switch,
the ohmmeter should read lower than 200 ohms.
Otherwise, replace switch. Reconnect connector.
If the switch tests good, temporarily disconnect
the inline DESS auxiliary module (see safety lan-
yard switch verification below for more informa-
tion). Connect the 6-pin connector to bypass the
auxiliary module. Try the start/stop switch.
If it works, try a new auxiliary module. Otherwise,
continue testing procedure.
Test continuity of circuit 2-23. If it is good, try a new
MPEM. Otherwise, repair harness/connectors.
Test continuity of circuit B-19. If it is good, try a new
EMS ECU. Otherwise, repair harness/connectors.
SAFETY LANYARD SWITCH
VERIFICATION
If 2 short beeps are not heard when installing the
safety lanyard, refer to DIAGNOSTIC PROCEDURES.
The following continuity tests can also be per-
formed using an ohmmeter.
Disconnect switch wires.
Safety Lanyard Removed
Connect test probes to switch BLACK and BLACK/
YELLOW wires. Measure resistance, there should
be NO continuity (open circuit).
WARNING
Always reconnect ignition coil cables at the
same spark plugs where they come from.
Otherwise, severe backfire may occur with
possible damage to exhaust system compo-
nents. The genuine wiring harness is de-
signed to prevent a cable mixing by using dif-
ferent cable lengths.
1
R1503motr197A
2
1
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