Volkswagen New Beetle. Manual - part 1529

Fig. 20: Disconnecting 4-Pin Connector From Ignition Coil -N152- (Engine Code AEG) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

Checking voltage supply 

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Connect multimeter to terminals 2 + 4 of the disconnected connector for voltage measurement. 

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Ignition-Glow Plug System, 2.0L Generic Scan Tool - New Beetle

  

Fig. 21: Connecting Multimeter To Igntion Coil Harness Connector Terminals 2 And 4 (Engine 
Code AEG) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Switch on ignition. Specified value: at least 11.5 V  

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Switch ignition off. 

If there is no voltage: 

z

Check wire between 4-pin connector terminal 2 and relay carrier for open circuits according to wiring 
diagram. Wire resistance: max. 1.5 ohm 

Fig. 22: Identifying Igntion Coil Harness Connector Terminals (Engine Code AEG) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Check for open circuit in wire between 4-pin connector terminal 4 and Ground (GND) according to 
wiring diagram. Wire resistance: max. 1.5 ohm 

If there is no malfunction in voltage supply:

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Ignition-Glow Plug System, 2.0L Generic Scan Tool - New Beetle

  

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Check activation. See CHECKING ACTIVATION .  

Checking activation 

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Remove fuse 32 from fuse holder. Fuse holder is located behind access panel at far left end of dash. 

Fig. 23: Locating Fuse 32 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Using adapter cables, connect voltage tester (VAG1527) to terminals 1 + 4 (ignition output 1), terminals 
3 + 4 (ignition output 2), of disconnected connector. 

Fig. 24: Identifying Ignition Coil Harness Connector Terminals (Engine Code AEG)

WARNING:

Do not touch ignition coil connecting parts or adapter cables during the 
following test.

NOTE:

By removing fuse 32, voltage supply to the fuel injectors is interrupted.

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Ignition-Glow Plug System, 2.0L Generic Scan Tool - New Beetle

  

Courtesy of VOLKSWAGEN OF AMERICA, INC.

z

Operate starter and test ignition signal from Engine Control Module (ECM). LED should flicker.  

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Switch ignition off. 

If LED flickers and voltage supply is OK: 

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Replace Ignition Coil -N152-. See item 12 .  

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Erase DTC memory of Engine Control Module (ECM). See DIAGNOSTIC MODE 4: RESET/ERASE 
DIAGNOSTIC DATA .  

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Generate readiness code. See READINESS CODE, GENERATING . 

If LED does not flicker: 

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Check wires. See CHECKING WIRING .  

Checking wiring 

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Connect test box to control module wiring harness. See TEST BOX FOR WIRING TEST, 
CONNECTING .  

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Check wires between test box and 4-pin connector for open circuit according to wiring diagram. 

Terminal 1 + socket 71 

Terminal 3 + socket 78 

Wire resistance: max. 1.5 ohm 

Fig. 25: Identifying Ignition Coil Harness Connector Terminals (Engine Code AEG) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Also check wires for short circuit to each other. Specified value: INFINITY ohm  

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Ignition-Glow Plug System, 2.0L Generic Scan Tool - New Beetle