Test Requirements
Ensure battery is okay. Ensure all fuses are okay, battery voltage is at least 11.5 volts and fuel pump relay is
okay. Ensure all electrical accessories are off and A/C is off.
Test Procedure
1. Connect scan tool. See RETRIEVING DIAGNOSTIC TROUBLE CODES . Turn ignition on, engine
off. Following scan tool manufacturer's instructions, check Transmission Control Module (J217) for
DTCs. If no DTCs are present, go to next step. If DTC(s) are present, repair as necessary. After repairs,
erase DTC memory. Verify repair. Test is complete. Perform ECM relearn procedure. See TEST DRIVE
RELEARN PROCEDURE .
2. Check wiring between Transmission Control Module (J217) and ECM (J220) for open or short circuits.
See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING
DIAGRAMS. See Fig. 61 , Fig. 62 and Fig. 63 . If wiring is okay, go to next step. If wiring 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. Check centralized matching resistor in ECM. Turn ignition off. Connect ECM to test box, leave ECM
harness connector disconnected from test box. Connect Test Box (VAG 1598/31). See CONNECTING
VAG TEST BOX . Using DVOM, check resistance between test box sockets No. 58 and 60. Resistance
should be 60-72 ohms. If resistance is not okay, 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 .
DTC P1628/18036: DRIVETRAIN DATA BUS - NO SIGNAL FROM STEERING ANGLE SENSOR
(G85)
NOTE:
If a test ends with ECM replacement. Before replacing ECM be certain that, all
wiring, power and ground supplies are okay. See ENGINE PERFORMANCE in
SYSTEM WIRING DIAGRAMS article in ELECTRICAL and ECM GROUND &
VOLTAGE SUPPLY .
NOTE:
Engine control module communicates with all control modules capable of
transferring data via a CAN (Controller Area Network) data bus. Data bus-
compatible control modules are connected together via two data bus wiring
twisted together (CAN high and CAN low) and exchange information
(messages). If information is not available in the CAN data bus from any one of
the control modules in the CAN data bus system it will be recognized as a
malfunction by the engine control module as well as other CAN data bus control
modules. The CAN data bus requires a matching resistor to function fault-free.
This central matching resistor is located in the engine control module.
NOTE:
If a test ends with ECM replacement. Before replacing ECM be certain that, all
wiring, power and ground supplies are okay. See ENGINE PERFORMANCE in
SYSTEM WIRING DIAGRAMS article in ELECTRICAL and ECM GROUND &
VOLTAGE SUPPLY .
2003 Volkswagen New Beetle GLS
2002-2003 ENGINE PERFORMANCE Self-Diagnostics - 1.8L Turbo
Helpmelearn Repair Manuals
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© 2004 Mitchell Repair Information Company, LLC.