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
Check Air Bag Control Module (J234) for DTC(s). See appropriate AIR BAG RESTRAINTS SYSTEM article,
under RESTRAINTS. 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 .
DTC P1612/18020: ECM (J220) - INCORRECTLY CODED
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. Ensure engine coolant temperature is at least 176°
F (80°C). On vehicles with M/T, gear shifter must be in neutral with parking brake set. On vehicles with A/T,
selector lever must be in park or neutral with parking brake set.
ECM Coding
Use scan tool to code ECM. See ENGINE CONTROL MODULE (J220) CODING .
DTC P1626/18034: DRIVETRAIN DATA BUS, NO SIGNAL FROM TRANSMISSION CONTROL
MODULE (J217)
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.
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
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
2001-2003 ENGINE PERFORMANCE Self-Diagnostics - 2.0L - Beetle, Golf & Jetta (Engine Codes AVH & AZG)
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