Section 08
ENGINE MANAGEMENT (4-TEC)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
08-03-32
SMR2003_027 _08_03A.FM
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.
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
terminals 1 and 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 terminal 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.
R1503motr190A
1
41
29
1
R1503motr197A
2
1
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.
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Содержание 2003 GTI LE RFI
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