Volkswagen New Beetle. Manual - part 1947

Diagnostic mode 8: Tank leak test 

Function 

This diagnostic mode checks the fuel system for leaks. 

Test requirements 

z

There must not be any DTCs stored in DTC memory. See DIAGNOSTIC MODE 3: CHECK DTC 
MEMORY .  

z

Coolant temperature must be 80 to 110° C. See DIAGNOSTIC MODE 1: CHECK MEASURED 
VALUES .  

z

Intake air temperature must not be above the maximum of 60° C. See DIAGNOSTIC MODE 1: 
CHECK MEASURED VALUES .  

Function test 

z

Connect diagnostic tester. See CONNECT DIAGNOSTIC TESTER .  

z

Start engine and let run at idle for at least 15 minutes.  

z

Under address word 33, select "Diagnostic mode 8: Tank leak test".  

z

Select measuring value "Test -ID 01: Tank leak test".  

z

Check specified value of tank leak test at idle.  

EVALUATION TEST-ID 01: TANK LEAK TEST 

z

Erase DTC memory after repairing malfunction. See DIAGNOSTIC MODE 4: 
RESET/ERASE DIAGNOSTIC DATA .  

NOTE:

z

The Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- 
and Leak Detection Pump (LDP) -V144- seal the tank system.  

z

Pressure (max. 70 mbar) can be applied to the fuel system via the test 
connection (in engine compartment, right) and via engine leak detection 
spray (e.g.: G 001 800 A1) leaks can be detected.  

Tank leak test

Specified value:

z

Test function is being initiated, please wait  

z

Test function aborted  

z

Test function active  

z

Test function off  

Test function active

NOTE:

z

During tank leak test, Engine Control Module (ECM) limits "test function 
active" to approx. 12 minutes.  

z

If the accelerator pedal is depressed during the test, the test will be 

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE On-Board Diagnostic (OBD), 2.0L Generic Scan Tool - New Beetle

  

If specified value is obtained: 

z

End diagnosis and switch ignition off.  

If specified value is not obtained: 

z

EVAP canister system, checking for proper seal. See EVAP CANISTER SYSTEM, CHECKING FOR 
PROPER SEAL .  

z

Check Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-. See EVAPORATIVE 
EMISSION (EVAP) CANISTER PURGE REGULATOR VALVE, CHECKING .  

z

Leak Detection Pump (LDP) -V144-, checking. See CHECK LEAK DETECTION PUMP (LDP) .  

Diagnostic mode 9: Vehicle information 

Function 

In this diagnostic mode, vehicle specific diagnostic data such as e.g. the control module versions will be 
displayed. 

Requirement 

z

There must not be any DTCs stored in DTC memory. See DIAGNOSTIC MODE 3: CHECK DTC 
MEMORY .  

Work procedure 

z

Connect diagnostic tester. See CONNECT DIAGNOSTIC TESTER .  

z

Switch ignition on.  

z

Under address word 33, select "Diagnostic mode 9: vehicle information".  

z

Select desired vehicle information "Test-ID XX".  

DISPLAY VEHICLE INFORMATION 

aborted.  

z

To repeat the tank leak test, switch ignition off and start engine again and 
let run at idle for at least 15 minutes.  

Test- ID

Diagnostic text

04:

Calibration identification, example: 

z

06A906032MC4622 Engine Control Module (ECM) identification 

06:

CVN (control module-check sum), example: 

z

E80034 the check sum is different for every control module version 

z

No results 

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE On-Board Diagnostic (OBD), 2.0L Generic Scan Tool - New Beetle

  

z

End diagnosis and switch ignition off.  

READINESS CODE 

Function 

The readiness code is an 8 digit number block that indicates the status of emission relevant diagnostics. 

When the diagnostic for a system (e.g.: secondary air system) has run through successfully, the respective digit 
of the number block is set from 1 to 0. 

Diagnostics are performed at regular intervals during normal vehicle operation. After repairing an emissions 
relevant system, the readiness code should be generated via a road test to ensure that these systems are working 
according to specifications. If a malfunction is recognized during diagnostic, it is stored in DTC memory. 

The readiness code is erased every time DTC memory is erased or when voltage supply is interrupted. DTC 
memory should therefore only be erased when there are DTCs stored. 

Read readiness code 

Requirements 

z

There must not be any DTCs stored in DTC memory. See DIAGNOSTIC MODE 3: CHECK DTC 
MEMORY .  

z

Coolant temperature must be at least 80° C DIAGNOSTIC MODE 1: CHECK MEASURED 
VALUES .  

Work procedure 

z

Connect diagnostic tester. See CONNECT DIAGNOSTIC TESTER .  

z

Start engine and let run at idle.  

z

Under address word 33, select "Diagnostic mode 1: Checking measured values."  

z

select desired measuring value "PID 01".  

z

Observe the right 8-digit number block:  

If all diagnoses have run through successfully, the 8-digit number block Specified value: "00000000" must be 
displayed. 

Evaluation PID 01: System status-information (right 8-digit number block:) 

EVALUATION PID 01: SYSTEM STATUS-INFORMATION 

Meaning if display position = 0
1

2 3 4 5 6 7 8

Diagnostic function

0

 

 

 

 

 

 

 

Exhaust gas recirculation OK 

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE On-Board Diagnostic (OBD), 2.0L Generic Scan Tool - New Beetle

  

If a 1 is displayed instead of a 0 in the 8-digit number block: 

z

Generate readiness code. See READINESS CODE, GENERATING .  

Readiness code, generating 

Requirements 

z

The respective fuses of the Motronic fuel injection and ignition system must be OK: 

Fig. 14: Identifying Fuses 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Battery voltage must be at least 11.5 volts. 

z

not available/always "0" 

 

0  

 

 

 

 

 

Oxygen sensor heater OK

 

  0  

 

 

 

 

Oxygen sensors OK

 

 

  0  

 

 

 

A/C system OK 

z

not available/always "0" 

 

 

 

  0  

 

 

Secondary Air Injection (AIR) system OK

 

 

 

 

  0  

 

EVAP canister system (tank ventilation system) OK

 

 

 

 

 

  0  

Catalytic converter heater OK 

z

not available/always "0" 

 

 

 

 

 

 

  0

Catalytic converter OK

NOTE:

Fuse holder is located behind access panel at far left end of dash.

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE On-Board Diagnostic (OBD), 2.0L Generic Scan Tool - New Beetle