Volkswagen New Beetle. Manual - part 1849

 

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Volkswagen New Beetle. Manual - part 1849

 

 

TROUBLE CODES .  

z

Perform adaptation of throttle valve control module. See THROTTLE VALVE CONTROL 
MODULE (J338) 
.  

z

On vehicles equipped with cruise control, activate cruise control to ECM. See 
ACTIVATING/DEACTIVATING CRUISE CONTROL .  

z

On vehicles equipped with A/T, perform adaptation of A/T to basic setting. See A/T BASIC 
SETTING 
.  

z

On vehicles equipped with A/T, perform adaptation of kickdown switch. See ADAPTING 
KICKDOWN FUNCTION 
.  

z

On vehicles equipped with factory alarm system, perform adaptation of immobilizer to ECM. See 
IMMOBILIZER .  

z

Perform idle check. See IDLE CHECK .  

z

Generate ECM readiness code. See READINESS CODE 

 

2003 Volkswagen New Beetle GLS 

2002-2003 ENGINE PERFORMANCE Self-Diagnostics - 1.8L Turbo

  

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2003 Volkswagen New Beetle GLS 

2002-2003 ENGINE PERFORMANCE Self-Diagnostics - 1.8L Turbo

  

Helpmelearn Repair Manuals 

 

Wednesday, December 14, 2005 8:44:28 AM

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Fig. 6: Removing Center & Left Inner Dash Covers (Beetle) 
Courtesy of VOLKSWAGEN UNITED STATES, INC. 

Fig. 7: Removing ECM Protective Cover & Bracket (Passat)

 

2003 Volkswagen New Beetle GLS 

2002-2003 ENGINE PERFORMANCE Self-Diagnostics - 1.8L Turbo

  

Helpmelearn Repair Manuals 

 

Wednesday, December 14, 2005 8:44:28 AM

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© 2004 Mitchell Repair Information Company, LLC. 

Courtesy of VOLKSWAGEN UNITED STATES, INC. 

ECM Ground & Voltage Supply 

1. Verify battery voltage is a minimum of 11.5 volts and all fuses are okay. Ensure battery and engine to 

body grounds are okay. Repair as necessary. Turn off all electrical consumers and A/C. Position shift 
lever in park (A/T) or neutral (M/T) and set parking brake. Connect scan tool. See Fig. 1 .  

2. Start engine and idle. Press keys "0" and "1" for address word "Engine Electronics". Press keys "0" and 

"8" for "Read Measuring Value Block" function 08 and enter by pressing "Q" key. Press keys "0", "0" 
and "4" for display group "4" and enter by pressing "Q" key. Read ECM voltage supply in "Specified 
value" window of display field "2". Press right arrow key and enter by pressing "Q" key. ECM voltage 
supply should be 12-14.5 volts. Turn ignition off. If voltage is less than 12 volts, go to next step. If 
voltage is more than 14.5 volts, go to step 4 . If voltage checks are okay. ECM power and ground circuits 
are okay. Test is complete.  

3. Check battery, alternator, parasitic load and ECM grounds. See appropriate WIRING DIAGRAM under 

ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. Repair as necessary. If repairs where 
performed, repeat steps 1 and 2 . If battery, alternator, parasitic load and ECM grounds are okay, go to 
step 5 .  

4. Possible cause is alternator and/or voltage regulator failure. Repair as necessary. If repairs were 

performed, repeat steps 1 and 2 . If alternator and voltage regulator are okay, go to next step.  

5. Turn ignition off. Connect Test Box (VAG 1598/31) to ECM harness connector. See CONNECTING 

VAG TEST BOX and go to next step.  

6.  

Turn ignition on. Using adapter cables from Test Kit (VAG 1594) and DVOM. Measure voltage supply at 
test box sockets No. 1 and 62 (ground and B+ 30). Battery voltage should be present. Measure voltage 
supply at test box sockets No. 2 and 3 (ground and ignition 15). Battery voltage should be present. If 
either voltage tests have failed, for all models (except Beetle engine code AWV) go to next step. For 
Beetle (engine code AWV), go to step 8 . If both voltage checks are okay. ECM power and ground 
circuits are okay. Test is complete. After reconnecting ECM, it is necessary to perform relearn procedure. 
Perform ECM relearn procedure. See TEST DRIVE RELEARN PROCEDURE 

7. Except Beetle (Engine Code AWV) 

Check voltage supply through ECM power supply relay. Turn ignition on. Using adapter cables from Test 
Kit (VAG 1594) and a DVOM, measure voltage supply at test box sockets No. 2 and 121. Battery voltage 
should be present. Check continuity of wire from terminal No. 21 at ECM to ECM power supply relay 
No. 5, (No. 4 on relay for Passat). If any voltage tests have failed, go to next step. If voltage and 

NOTE:

Manufacturer recommends using Scan Tool (VAG 1551/1552 or VAS 5051/5052). 
The following tests are preformed using Scan Tool (VAG 1551/1552 or VAS 
5051/5052). For location of Data Link Connector (DLC), see RETRIEVING 
DIAGNOSTIC TROUBLE CODES . 

NOTE:

If test box is not available. Use wiring diagram and DVOM to check ECM 
grounds and voltage supply, see appropriate WIRING DIAGRAM under 
ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. 

 

2003 Volkswagen New Beetle GLS 

2002-2003 ENGINE PERFORMANCE Self-Diagnostics - 1.8L Turbo

  

Helpmelearn Repair Manuals 

 

Wednesday, December 14, 2005 8:44:28 AM

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