CIRCUIT TESTING
ELECTRIC VACUUM PUMP (MODELS UP TO 05/2002)
Disconnect electric brake vacuum pump 6-pin harness connector. Vacuum pump is located on subframe in front
of steering box, left side. See Fig. 8 . Check for poor, loose, corroded or damaged terminal connection. Also,
check instrument panel fuses No. 31 and 51. If problem is found, repair as necessary. After repair, recheck
vacuum pump operation. See ELECTRIC VACUUM PUMP under TESTING.
If no problem with terminals is found, perform circuit testing of vacuum pump. See ELECTRIC VACUUM
PUMP TESTING (MODELS UP TO 05/2002) table. For aid in identifying terminals and circuits, see Fig.
10 . For Engine Control Module (ECM) terminal testing and identification, see appropriate article in ENGINE
PERFORMANCE.
Fig. 10: Identifying Electric Vacuum Pump Harness Connector Terminals & Pin Voltage Chart (Models
Up To 05/2002)
Courtesy of VOLKSWAGEN UNITED STATES, INC.
ELECTRIC VACUUM PUMP TESTING (MODELS UP TO 05/2002)
NOTE:
If the measured figures only deviate slightly from the specifications, clean
sockets and plugs of the testers and adapter cables (with contact spray G 000
700 04 or equivalent) and repeat check. Before replacing components, check
wiring and connections and also, particularly for specifications of less than 10
ohms, repeat resistance check on component.
Test
Perform Test Step
No.
See
Fig.
Brake System Vacuum Pump Resistance
1
Fig.
11
Communication Signal From ECM To Brake System
2
Fig.
2003 Volkswagen New Beetle GLS
1998-2004 BRAKES Disc - New Beetle
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