Test Procedure
1. Using DVOM, check voltage supply to ignition coil of cylinder indicated by DTC, (e.g. DTC
P1355/17763, check voltage supply to ignition coil/output stage at cylinder No. 1). Disconnect ignition
coil harness connector. Turn ignition on, engine off. Check voltage between harness connector terminals
No.1 and 2. See Fig. 41 . Check voltage between harness connector terminals No. 1 and 4, each voltage
reading should be a minimum of 11.5 volts. Turn ignition off. If no voltage is present, go to next step. If
voltage readings are okay, go to step 6 .
2. Using DVOM, check wiring for open circuits between ignition coil harness connector terminal No. 1 and
power supply relay using wiring diagram. See appropriate WIRING DIAGRAM under ENGINE
PERFORMANCE in SYSTEM WIRING DIAGRAMS. See Fig. 41 . Resistance reading should be a
maximum of 1.5 ohms. If resistance reading is okay, go to next step. If resistance reading is not okay,
repair as necessary. After repairs, erase DTC memory. Verify repair. Test is complete. Perform ECM
relearn procedure. See TEST DRIVE RELEARN PROCEDURE .
3. Using DVOM, check wiring for open circuits between ignition coil harness connector terminal No. 2 and
ground, and harness connector terminal No. 4 ground. See Fig. 41 . Resistance should be a maximum of
1.5 ohms for each reading. If resistance readings are okay, go to next step. If resistance reading is not
okay, repair as necessary. After repairs, erase DTC memory. Verify repair. Test is complete. Perform
ECM relearn procedure. See TEST DRIVE RELEARN PROCEDURE .
4. Turn ignition off. Disconnect ECM harness connector, leave ECM disconnected from test box. Connect
Test Box (VAG 1598/31) to ECM harness connector. See CONNECTING VAG TEST BOX . Using
DVOM, check resistance between the following ignition coil/output stage harness connectors and VAG
test box sockets. See IGNITION COIL HARNESS CONNECTOR/TEST BOX SOCKET
IDENTIFICATION table and Fig. 41 . Resistance should be a maximum of 1.5 ohms for each reading.
If resistance readings are okay, go to next step. If resistance reading is not okay, repair as necessary. After
repairs, erase DTC memory. Verify repair. Test is complete. Perform ECM relearn procedure. See TEST
DRIVE RELEARN PROCEDURE .
IGNITION COIL HARNESS CONNECTOR/TEST BOX SOCKET IDENTIFICATION
5. Check wiring in ignition coil harness connector for short circuits to one another and for short circuits to
ground and B+. If resistance measurements are okay and no short circuits exist. Replace faulty ECM. See
ENGINE CONTROL MODULE REMOVAL & INSTALLATION . After repairs, erase DTC
memory. Verify repair. Test is complete. Perform ECM relearn procedure. See TEST DRIVE
RELEARN PROCEDURE .
6.
Cylinder
Ignition Coil Harness Connector Terminal
VAG Test Box Socket
1
3
102
2
3
95
3
3
103
4
3
94
WARNING:
During following test do not touch ignition coils, ignition coil
harness connectors or test cables.
2003 Volkswagen New Beetle GLS
2002-2003 ENGINE PERFORMANCE Self-Diagnostics - 1.8L Turbo
Helpmelearn Repair Manuals
Wednesday, December 14, 2005 8:44:50 AM
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© 2004 Mitchell Repair Information Company, LLC.