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Section 08 ENGINE MANAGEMENT (4-TEC)
Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
If wiring harness is defective, repair the connector
or replace the wiring harness between ECM con-
nector 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.
Remove ignition coil from spark plug.
1
R1503motr197B
2
1
Molykote 111
1. Spark plug terminal
Using a multimeter, check the resistance in both
primary and secondary windings.
For primary winding check the resistance be-
tween terminals 1 and 2 of the ignition coil.
The resistance should be between 0.85 and
1.15
at 20°C (68°F).
For secondary winding check the resistance be-
tween terminal 1 and spark plug terminal.
The resistance should be between 9.5 and 13.5 k
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 ECM.
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.
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 com-
ponents.
The genuine wiring harness is
designed to prevent a cable mixing by using
different cable lengths.
IGNITION TIMING
The ECM is able to determine the exact position
of camshaft and crankshaft. That means that no
ignition timing setting has to be performed.
ENGINE START/STOP SWITCH
VERIFICATION
A quick operation test can be done using the ve-
hicle communication kit (VCK) with the B.U.D.S.
software, using the
Monitoring
tab. 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, ECM and wiring). You know
now the problem is on the output side of the start-
ing system (MPEM output signal to starting so-
lenoid, wiring harness going to the solenoid and
starter motor. Refer to STARTING SYSTEM for
testing procedures). Otherwise, check the input
side as follows.
Disconnect the start/stop switch connector. Us-
ing an ohmmeter, connect test probes to YEL-
LOW/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. Recon-
nect connector.
Test continuity of circuit 2-23. If it is good, try a
new MPEM. Otherwise, repair harness/connec-
tors.
Test continuity of circuit B-19. If it is good, try a
new ECM. Otherwise, repair harness/connectors.
SAFETY LANYARD SWITCH
VERIFICATION
If 2 short beeps are not heard when installing
the safety lanyard, refer to DIAGNOSTIC PROCE-
DURES.
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).
smr2004-Complete Line Up
437
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Summary of Contents for 2006 GTI
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