Volkswagen New Beetle. Manual - part 1920

 

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Volkswagen New Beetle. Manual - part 1920

 

 

4.  

Turn ignition off. Disconnect ECM harness connector, leave ECM disconnected from test box. Connect 
Test Box (VAG 1598/31) or (VAG 1598/22) to ECM harness connector. See CONNECTING VAG 
TEST BOX 
. Using DVOM, check resistance between APP sensor circuits and test box sockets. See 
APP SENSOR 6-PIN HARNESS CONNECTOR/VAG TEST BOX SOCKET IDENTIFICATION 
table. Record resistance readings. Resistance should be a maximum of 1.5 ohms for each reading. Check 
wiring in APP sensor 6-pin harness connector for short circuits to one another, and for short circuits to B+ 
and ground. If resistance measurements are okay and no short circuits exist, go to next step. If any 
resistance measurement is not okay, or a short circuit exists, repair circuit(s), as necessary. After repairs, 
erase DTC memory. Verify repair. Test is complete. Perform ECM relearn procedure. See TEST DRIVE 
RELEARN PROCEDURE 

APP SENSOR 6-PIN HARNESS CONNECTOR/VAG TEST BOX SOCKET IDENTIFICATION 

5. Replace faulty APP sensors No. 1 (G79) and No. 2 (G185). Accelerator position sensors are an integral 

part of the accelerator pedal assembly. After repairs, erase DTC memory. Adapt APP sensors to 
Transmission Control Module (J217). See A/T BASIC SETTING . Verify repair. Test is complete. 
Perform ECM relearn procedure. See TEST DRIVE RELEARN PROCEDURE .  

NOTE:

If accelerator pedal assembly is replaced, APP sensors must be adapted 
to the A/T control module. 

NOTE:

APP sensor harness connector terminal No. 5 is for A/T models only. 

APP Sensor 6-Pin Harness Connector Terminal 

VAG Test Box Socket 

72 

73 

36 

35 

33 

34 

 

2003 Volkswagen New Beetle GLS 

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

  

Helpmelearn Repair Manuals 

 

Wednesday, December 14, 2005 8:45:01 AM

Page 302 

© 2004 Mitchell Repair Information Company, LLC. 

1998-2004 ENGINE PERFORMANCE

On-Board Diagnostic (OBD), 1.8L Generic Scan Tool - New Beetle 

ST GENERAL SCAN TOOL 

GENERAL INFORMATION FOR ON BOARD DIAGNOSTIC (OBD) 

Characteristics of On Board Diagnostic (OBD) 

The Engine Control Module (Motronic Engine Control Module (ECM) -J220-) is equipped with DTC memory. 

If malfunctions occur at the exhaust relevant systems or components, they are stored in DTC memory with a 
description of the malfunction type. 

The Engine Control Module (ECM) differentiates between different DTCs after evaluating the information, see 
DIAGNOSTIC TROUBLE CODE (DTC) TABLES: 

The stored malfunctions can be checked with a standard diagnostic tester, see DIAGNOSTIC MODE 3: 
CHECK DTC MEMORY
 . 

When harness connectors are disconnected from the Engine Control Module (ECM) or the battery is 
disconnected, all adaptation values in the control module are erased. DTC memory content will remain intact 
however. If the engine is started after this, rough, uneven idle can result. In this case, the readiness code must be 
generated again, see READINESS CODE, GENERATING . 

The following work steps must be performed in the described sequence after the malfunction(s) have been 
repaired: 

1. - Check DTC memory, see DIAGNOSTIC MODE 3: CHECK DTC MEMORY .  

2. - Erase DTC memory, see DIAGNOSTIC MODE 4: RESET/ERASE DIAGNOSTIC DATA .  

3. - For completion, generate readiness code, see READINESS CODE, GENERATING .  

On Board Diagnostic (OBD), technical data 

Control module identification 

The control module version is displayed by selecting "Diagnostic mode 9: Vehicle information" under address 
word 33, see DIAGNOSTIC MODE 9: VEHICLE INFORMATION . 

Engine Control Module (ECM) equipment 

ENGINE CONTROL MODULE (ECM) EQUIPMENT DESCRIPTION 

Engine code

APH

AWP

AWV

System identification

Motronic ME7.5

Motronic ME7.5

Motronic ME7.5

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE On-Board Diagnostic (OBD), 1.8L Generic Scan Tool - New Beetle

  

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE On-Board Diagnostic (OBD), 1.8L Generic Scan Tool - New Beetle

  

Selectable diagnostic modes under address word 33 - OBD 

SELECTABLE DIAGNOSTIC MODES UNDER ADDRESS WORD 33 - OBD 

Terminals at Engine Control Module 
(ECM)

121

121

121

Emissions limiting values according to

TLEV

(1)

LEV

(2)

LEV

(2)

On Board Diagnostic (OBD)

OBD II

OBD

II OBD II

DTC memory

Permanent memory

(3)

Permanent memory

(3)

Permanent memory

(3)

Memory for adaptation values

Temporary memory

(4)

Temporary memory

(4)

Temporary memory

(4)

Oxygen sensor control

2 sensors

2 sensors

2 sensors

Knock sensor control

2 knock sensors

2 knock sensors

2 knock sensors

Intake manifold change-over

No

No

No

Camshaft adjustment

No

Yes

Yes

Boost pressure regulation

Yes

Yes

Yes

Secondary Air Injection (AIR) system

Yes

Yes

Yes

Electronic engine performance 
regulation

Yes

Yes

Yes

(1)

TLEV = Transient Low Emission Vehicles (emission values max. 0.125 g/mi HC)

(2)

LEV = Low Emission Vehicles (emission values max. 0.075 g/mi HC)

(3)

Independent of voltage supply.

(4)

Values are erased when voltage supply is interrupted.

NOTE:

The conditions required for selecting the desired diagnostic mode are listed in 
the SELECTABLE DIAGNOSTIC MODES UNDER ADDRESS WORD 33 - OBD 
table.

Diagnostic mode

Requirement:

Selectable diagnostic modes under address word 33 - 
OBD

z

engine 

off  

z

Ignition 

switched 

on.  

z

Engine 

running 

at idle  

z

Vehicle 

in drive 

mode 

Mode 
1:

Check measured 

values

See DIAGNOSTIC MODE 

1: CHECK MEASURED 

VALUES

Yes

Yes

Yes

Mode 
2:

Checking 

operating 

conditions

See DIAGNOSTIC MODE 

2: CHECKING 

OPERATING 

CONDITIONS

Yes

Yes

Yes

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE On-Board Diagnostic (OBD), 1.8L Generic Scan Tool - New Beetle

  

Connect diagnostic tester 

Recommended special tools and equipment.: 

z

VAS 5052 Vehicle Diagnostic and Information System with  

z

VAS 5052/3 diagnostic cable  

Requirements 

Mode 
3:

Check DTC 

Memory

See DIAGNOSTIC MODE 

3: CHECK DTC MEMORY

Yes

1)

Yes

Yes

Mode 
4:

Reset/erase 

diagnostic data

See DIAGNOSTIC MODE 

4: RESET/ERASE 

DIAGNOSTIC DATA

Yes

Yes

Yes

Mode 
5:

Check output of 

oxygen sensor 

signals

See DIAGNOSTIC MODE 

5: CHECK OUTPUT OF 

OXYGEN SENSOR 

SIGNALS

Yes

Yes

Yes

Mode 
6:

Check test results 

of components 

that are not 

continuously 

monitored

See DIAGNOSTIC MODE 

6: CHECK TEST 

RESULTS OF 

COMPONENTS THAT 

ARE NOT 

CONTINUOUSLY 

MONITORED

No

Yes

Yes

Mode 
7:

Check test results 

of components 

that are 

continuously 

monitored

See DIAGNOSTIC MODE 

7: CHECK TEST 

RESULTS OF 

COMPONENTS THAT 

ARE CONTINUOUSLY 

MONITORED

Yes

(1)

Yes

Yes

Mode 
8:

Tank leak test

See DIAGNOSTIC MODE 

8: TANK LEAK TEST

No

Yes

No

Mode 
9:

Vehicle 

information

See DIAGNOSTIC MODE 

9: VEHICLE 

INFORMATION

Yes

Yes

Yes

(1)

Perform only with ignition switched on when engine does not start (operate starter beforehand for at 
least 6 seconds).

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE On-Board Diagnostic (OBD), 1.8L Generic Scan Tool - New Beetle

  

 

 

 

 

 

 

 

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