WIRING DIAGRAMS. Repair as necessary.
5.
With all fuel injector harness connectors disconnected, connect LED equipped test light between fuel
injector harness connector terminals No. 1 and 2. Using ignition switch, operate starter. Test light should
flash. Repeat test at all fuel injector harness connectors. If LED test light does not flash at all fuel injector
harness connectors, go to next step. If LED test light flashes at all fuel injector harness connectors, go to
step 7 .
6. 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 fuel injector harness connector and VAG test box socket.
See FUEL INJECTOR HARNESS CONNECTOR/VAG TEST BOX SOCKET IDENTIFICATION
table. See Fig. 36 and Fig. 17 .
FUEL INJECTOR HARNESS CONNECTOR/VAG TEST BOX SOCKET IDENTIFICATION
Resistance should be a maximum of 1.5 ohms for each reading. Check wiring in fuel injector pin 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 ECM. After repairs, erase DTC memory.
Verify repair. Test is complete. Perform ECM relearn procedure. See TEST DRIVE RELEARN
PROCEDURE . If any resistance measurement is not okay, or a short circuit exists, repair circuit(s) as
necessary. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM
WIRING DIAGRAMS. After repairs, erase DTC memory. Verify repair. Test is complete. Perform ECM
relearn procedure. See TEST DRIVE RELEARN PROCEDURE .
7. Check fuel pressure and fuel pressure regulator. See FUEL SYSTEMS in appropriate SYSTEM &
COMPONENT TESTING article. If fuel pressure is okay, go to next step. If fuel pressure 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 .
8. Check fuel injector volume (possible blocked or leaking injector). See FUEL SYSTEMS in appropriate
SYSTEM & COMPONENT TESTING article. If fuel injector volume is okay, and fuel injectors do not
leak more than 2 drops per minute each, go to next step. If fuel injector volume is not okay and /or any
fuel injectors leak more than 2 drops per minute each, repair as necessary. After repairs, erase DTC
memory. Verify repair. Test is complete. Perform ECM relearn procedure. See TEST DRIVE
RELEARN PROCEDURE .
DTC P0300/16684, DTC P0301/16685, DTC P0302/16686, DTC P0303/16687 & DTC P0304/16688
NOTE:
Test light may not go out completely, but should dull and get brighter
during activation.
Cylinder
Fuel Injector Harness Connector Terminal
VAG Test Box Socket
1
2
96
2
2
89
3
2
97
4
2
88
2003 Volkswagen New Beetle GLS
2002-2003 ENGINE PERFORMANCE Self-Diagnostics - 1.8L Turbo
Helpmelearn Repair Manuals
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