Volkswagen New Beetle. Manual - part 1788

 

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Volkswagen New Beetle. Manual - part 1788

 

 

14. If brake light switch/brake pedal switch and all wiring is okay, replace faulty ECM. After repairs, erase 

DTC memory. See CLEARING DIAGNOSTIC TROUBLE CODES (FUNCTION 05) under SELF 
DIAGNOSTIC SYSTEM. Verify repair. Test is complete. Perform ECM relearn procedure. See TEST 
DRIVE RELEARN PROCEDURE 
.  

Fig. 27: Identifying Test Points On Brake Switch 
Courtesy of VOLKSWAGEN UNITED STATES, INC.

Brake Light Switch/Brake Pedal Switch Harness Connector 
Terminal 

VAG Test Box 

Socket 

65 

32 

 

2003 Volkswagen New Beetle GLS 

2002-2004 ENGINE PERFORMANCE Self-Diagnostics - 1.9L Turbo Diesel - Beetle, Golf & Jetta (Engine Code ALH)

  

Helpmelearn Repair Manuals 

 

Wednesday, December 14, 2005 8:48:22 AM

Page 64 

© 2004 Mitchell Repair Information Company, LLC. 

Fig. 28: Identifying Test Points On Brake Switch Harness Connector 
Courtesy of VOLKSWAGEN UNITED STATES, INC. 

DTC P0601/16985, DTC P0605/16989, DTC P0606/16990, DTC P1387/17795 & DTC P1640/18048 

Code Definition 

DTC P0601/16985 
ECM (J248) - Inoperative 

DTC P0605/16989 
ECM (J248) - Inoperative 

DTC P0606/16990 
ECM (J248) - Inoperative 

DTC P1387/17795 
ECM (J248) - Inoperative 

DTC P1640/18048 
ECM (J248) - Inoperative  

NOTE:

For connector terminal wire colors, see appropriate WIRING DIAGRAM under 
ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. For component 
locations, see COMPONENT LOCATIONS . 

 

2003 Volkswagen New Beetle GLS 

2002-2004 ENGINE PERFORMANCE Self-Diagnostics - 1.9L Turbo Diesel - Beetle, Golf & Jetta (Engine Code ALH)

  

Helpmelearn Repair Manuals 

 

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Possible Effects 

Possible effects are poor engine performance, engine may not start and/or engine stalls.  

Test Procedures 

No test procedure is required for this fault code. Replace Engine Control Module (ECM).  

DTC P0670/17054, DTC P0671/17055, DTC P0672/17056, DTC P0673/17057, DTC P0674/17058 & DTC 
P0684/17068 

Code Definition 

DTC P0670/17054 
Glow Plug Control Module (J370) - Open Circuit/Short To Ground 

DTC P0671/17055 
Glow Plug Cylinder No. 1 - Open Circuit/Short To Ground 

DTC P0672/17056 
Glow Plug Cylinder No. 2 - Open Circuit/Short To Ground 

DTC P0673/17057 
Glow Plug Cylinder No. 3 - Open Circuit/Short To Ground 

DTC P0674/17058 
Glow Plug Cylinder No. 4 - Open Circuit/Short To Ground 

DTC P0684/17068 
Glow Plug Control Module (J370) - Open Circuit To ECM  

NOTE:

Before replacing any component, ensure all connectors at component and ECM 
are clean and tight. After making any repairs, disconnect ECM harness 
connector for 10 seconds, connect ECM harness connector and retest system. 
It is necessary to generate an ECM readiness code if ECM memory is cleared, 
battery voltage is disconnected or ECM is disconnected. 

NOTE:

Before replacing ECM be certain that, all wiring, power and ground supplies are 
okay. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in 
ELECTRICAL and ECM GROUND & VOLTAGE SUPPLY . 

NOTE:

For connector terminal wire colors, see appropriate ENGINE PERFORMANCE 
wiring diagram in SYSTEM WIRING DIAGRAMS. For component locations, see 
COMPONENT LOCATIONS . 

NOTE:

Before replacing any component, ensure all connectors at component and ECM 

 

2003 Volkswagen New Beetle GLS 

2002-2004 ENGINE PERFORMANCE Self-Diagnostics - 1.9L Turbo Diesel - Beetle, Golf & Jetta (Engine Code ALH)

  

Helpmelearn Repair Manuals 

 

Wednesday, December 14, 2005 8:48:22 AM

Page 66 

© 2004 Mitchell Repair Information Company, LLC. 

Possible Effects 

Possible effects are no glow plug operation and/or engine runs rough when cold.  

Test Requirements 

Fuses must be okay. Ensure battery voltage is at least 11.5 volts, glow plug fuse strip is okay, glow plug relay is 
operating properly. A/C and all electrical accessories must be switched off. Alternator must be okay. Engine 
must be cold.  

Test Procedures 

1. Check wiring going to Glow Plug Control Module (J370). See appropriate WIRING DIAGRAM under 

ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.  

2. If wiring going to Glow Plug Control Module (J370) is okay, go to next step. If wiring is NOT okay, 

repair as necessary. After repairs, erase DTC memory. See CLEARING DIAGNOSTIC TROUBLE 
CODES (FUNCTION 05) 
under SELF DIAGNOSTIC SYSTEM. Verify repair. Test is complete. 
Perform ECM relearn procedure. See TEST DRIVE RELEARN PROCEDURE .  

3.  

Engine must be cold. Start the engine and run at idling speed. Connect VAG 1715 Multimeter in 
sequence to glow plug wire for each cylinder using current pick-up clamp. Record each reading. 
Specified value is minimum of 6 amps for each reading. If specification is obtained, go to next step. If 
specification is not obtained, check and repair wiring going to Glow Plug Control Module (J370). See 
appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING 
DIAGRAMS. After repairs, erase DTC memory. See CLEARING DIAGNOSTIC TROUBLE CODES 
(FUNCTION 05) 
under SELF DIAGNOSTIC SYSTEM. Verify repair. Test is complete. Perform ECM 
relearn procedure. See TEST DRIVE RELEARN PROCEDURE .  

4. Turn ignition off. Disconnect glow plug harness connectors. Check glow plugs using diode test lamp. 

Connect diode test lamp to battery positive (+). Probe each glow plug terminal. Diode test lamp should 
light up. If diode test lamp does not light up, replace glow plug. After repairs, erase DTC memory. See 
CLEARING DIAGNOSTIC TROUBLE CODES (FUNCTION 05) under SELF DIAGNOSTIC 
SYSTEM. Verify repair. Test is complete. Perform ECM relearn procedure. See TEST DRIVE 
RELEARN PROCEDURE 
. Tightening torque for glow plugs are 11 ft. lbs. (15 N.m).  

DTC P1160/17568 & DTC P1161/17569 

Code Definition 

DTC P1160/17568 

are clean and tight. After making any repairs, disconnect ECM harness 
connector for 10 seconds, connect ECM harness connector and retest system. 
It is necessary to generate an ECM readiness code if ECM memory is cleared, 
battery voltage is disconnected or ECM is disconnected. 

NOTE:

Test must be done within 3 minutes after starting engine. 

 

2003 Volkswagen New Beetle GLS 

2002-2004 ENGINE PERFORMANCE Self-Diagnostics - 1.9L Turbo Diesel - Beetle, Golf & Jetta (Engine Code ALH)

  

Helpmelearn Repair Manuals 

 

Wednesday, December 14, 2005 8:48:22 AM

Page 67 

© 2004 Mitchell Repair Information Company, LLC. 

 

 

 

 

 

 

 

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