Volkswagen New Beetle. Manual - part 1804

 

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Volkswagen New Beetle. Manual - part 1804

 

 

 

2003 Volkswagen New Beetle GLS 

2001-2003 ENGINE PERFORMANCE Self-Diagnostics - 2.0L - Beetle, Golf & Jetta (Engine Codes AVH & AZG)

  

Helpmelearn Repair Manuals 

 

Wednesday, December 14, 2005 8:49:53 AM

Page 16 

© 2004 Mitchell Repair Information Company, LLC. 

Fig. 5: Removing Center & Left Inner Dash Covers (Beetle) 
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. Shift lever in park 
(A/T) or neutral (M/T). Set parking brake. Battery voltage must a minimum of 11.5 volts. Connect scan 
tool. See Fig. 1 . Start engine and idle.  

2. 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. Press keys "0" and "6" for function "End Output" and enter by 
pressing "Q" key.  

3. ECM voltage supply should be a minimum of 11.5 volts. Turn ignition off. If voltage is less than battery 

voltage, go to next step. If voltage is above 14.5 volts, go to step 5 . If voltage checks are okay, ECM 
power and ground circuits are okay. Test is complete.  

4. Check battery, alternator, parasitic load and ECM grounds. See ENGINE PERFORMANCE in SYSTEM 

WIRING DIAGRAMS article in ELECTRICAL. 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 6 .  

5. 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.  

6. Turn ignition off. Connect Test Box (VAG 1598/31) to ECM harness connector, leave ECM disconnected 

from test box. See CONNECTING VAG TEST BOX and go to next step. 

7. Turn ignition on. Using adapter cables from Test Kit (VAG 1594) and a 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 62 (ground and B+ 30). Battery voltage should be present.  

8. Measure voltage supply at test box sockets No.1 and 3 (ground and ignition 15). 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 voltage is not okay, check wires and wiring connections on relay panel. 
Repair as necessary. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in 
ELECTRICAL. Verify repairs. Test is complete. If both voltage checks are okay. ECM power and ground 
circuits are okay. Test is complete.  

OUTPUT DIAGNOSTIC TEST MODE (FUNCTION 03) 

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 Fig. 1 . 

NOTE:

If test box is not available. Use wiring diagram and DVOM to check ECM 
grounds and voltage supply. SeeENGINE PERFORMANCE in SYSTEM 
WIRING DIAGRAMS article in ELECTRICAL. 

 

2003 Volkswagen New Beetle GLS 

2001-2003 ENGINE PERFORMANCE Self-Diagnostics - 2.0L - Beetle, Golf & Jetta (Engine Codes AVH & AZG)

  

Helpmelearn Repair Manuals 

 

Wednesday, December 14, 2005 8:49:53 AM

Page 17 

© 2004 Mitchell Repair Information Company, LLC. 

Generic Scan Tool 

Turn ignition off. Connect scan tool to diagnostic connector located under left side of dashboard. See Fig. 1 . 
Follow scan tool manufacturer instructions for entering OUTPUT DIAGNOSTIC TEST MODE.  

Scan Tool VAG 1551/1552 or VAS 5051/5052 

Connect scan tool to DLC. DLC is located at left side of steering column. See Fig. 1 . Turn ignition on, engine 
off. Press keys "0" and "1" for address word "Engine Electronics", press keys "0" and "3" for DTM and enter by 
pressing "Q" key. During output DTM sequence individual components will be activated until advancing to the 
next component by pressing right arrow key. It is possible to skip a component by pressing arrow key more than 
once. When finished, press keys "0" and "6" for function "End Output" and enter by pressing "Q" key.  

Output Diagnostic Test Mode activates the following components in sequence:  

1. EVAP Canister Purge Valve (N80)  

2. Secondary Air Injection Pump Relay (J299)  

3. EVAP Leak Diagnostic Pump (V144)  

4. Injector, Cylinder 1 (N30)  

5. Injector, Cylinder 2 (N31)  

6. Injector, Cylinder 3 (N32)  

7. Injector, Cylinder 4 (N33)  

DRIVE CYCLES 

Generate readiness code after performing repairs on exhaust emission systems in order to guarantee that these 
systems function correctly. If a malfunction is detected during diagnostic, malfunction will be entered in DTC 
memory. For Test Drive Relearn Procedure and Readiness Code. See TEST DRIVE RELEARN 
PROCEDURE 
and READINESS CODE under PROGRAMMING.  

Warm-Up Phase: Engine started with coolant temperature below 122°F (50°C), switched off at above 
162°F (72°C).  

NOTE:

Manufacturer recommends use of Scan Tool VAG 1551/1552 or VAS 5051/5052. 
Generic scan tool may not be able to perform all test functions. Output 
Diagnostic Test Mode (DTM) can be aborted by pressing "C" key. DTM will be 
aborted after 60 seconds, if right arrow key is not pressed again. 

NOTE:

When using scan tool in DTM to activate engine components, some 
components may be barely audible. Check component by touch or use 
mechanics stethoscope if necessary. Fuel pump runs continuously during DTM. 

NOTE:

Activation sequence of components may vary, depending on current ECM 
version. 

 

2003 Volkswagen New Beetle GLS 

2001-2003 ENGINE PERFORMANCE Self-Diagnostics - 2.0L - Beetle, Golf & Jetta (Engine Codes AVH & AZG)

  

Helpmelearn Repair Manuals 

 

Wednesday, December 14, 2005 8:49:53 AM

Page 18 

© 2004 Mitchell Repair Information Company, LLC. 

Road Test: Coolant temperature needs to be greater than 176° F (80° C). Idle, partial throttle, full throttle 
and overdrive, all must be attained several times. During test drive, apply full throttle until engine speed 
exceeds 3500 RPM.  

PROGRAMMING 

READINESS CODE 

Readiness Code Description 

Readiness code must be generated when ECM memory is cleared, ECM loses battery voltage or is replaced. 
Readiness Code appears as an 8-digit display after entering function 15 (display Readiness Code function) on 
scan tool (Scan Tool VAG 1551/1552 or VAS 5051/5052).  

Each of the 8 digits is related to a specific exhaust emissions related system. Not all 8 exhaust emission related 
systems are checked when ECM generates Readiness Code. See Fig. 6 . Some exhaust emission related systems 
that are not part of Readiness Code are checked.  

During a test sequence OBD (ECM) system checks function of each relevant exhaust emission system. OBD 
system checks components and generates Readiness Code at regular intervals during normal driving. See 
GENERATING READINESS CODE .  

Reading Readiness Code 

Before reading readiness code, perform a long road test. Coolant temperature needs to be greater than 176° F 
(80° C). Idle, partial throttle, full throttle and overdrive must all be attained several times. During test drive, 
apply full throttle until engine speed exceeds 3500 RPM. OBD system checks components and generates 
Readiness Code at regular intervals during normal driving. See GENERATING READINESS CODE 
Readiness code is erased if DTC memory is erased or voltage supply to ECM is lost.  

Reading Readiness Code - Generic Scan Tool 

NOTE:

On Beetle, Golf and Jetta, Throttle Valve Control Module (TVCM - J338) 
adaptation is part of Readiness Code procedures. TVCM (J338) adaptation can 
also be performed by it self. See THROTTLE VALVE CONTROL MODULE (J338) . 

NOTE:

Manufacturer recommends use of Scan Tool VAG 1551/1552 or VAS 5051/5052. 
Not all eight diagnostic functions in Readiness Code are used. See Fig. 6 . It is 
recommended that readiness code be read and that readiness code be 
generated (if necessary) before performing smog check to guarantee that 
emission relevant systems function correctly. Generate readiness code after 
performing repairs on exhaust emission systems in order to guarantee that 
these systems function correctly. If a malfunction is detected during diagnostic, 
malfunction will be entered in DTC memory. 

NOTE:

Before reading readiness code, perform a long road test. Coolant temperature 

 

2003 Volkswagen New Beetle GLS 

2001-2003 ENGINE PERFORMANCE Self-Diagnostics - 2.0L - Beetle, Golf & Jetta (Engine Codes AVH & AZG)

  

Helpmelearn Repair Manuals 

 

Wednesday, December 14, 2005 8:49:53 AM

Page 19 

© 2004 Mitchell Repair Information Company, LLC. 

 

 

 

 

 

 

 

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