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HOMESERVICE MANUALSVOLKSWAGEN2002JETTA GLS, 4D SEDAN, 1.8 D, AUTOMATICREPAIR AND DIAGNOSISENGINE MECHANICALFUEL SYSTEM1.8L - FUEL SUPPLY - AWD, AWP, AWW (A4 PLATFORM)FUEL SUPPLYEVAP CANISTER SYSTEMCHECK LEAK DETECTION PUMP (LDP)TEST SEQUENCE
2002 Volkswagen Jetta GLS, 4D Sedan, 1.8 D, Automatic

Test sequence

2002 Volkswagen Jetta GLS, 4D Sedan, 1.8 D, AutomaticSECTION Test sequence
  • Rear right wheelhousing liner, removing:
  • Disconnect 3-pin connector of Leak detection pump (LDP) -V144- (arrow).
    • Fig 1: Disconnecting 3-Pin Connector Of Leak Detection Pump -V144-
    G03459030Courtesy of VOLKSWAGEN OF AMERICA, INC.
  • Measure resistance between terminals 1 + 3 of diagnostic pump.

    Specified value: 640...720 Ξ©

    • Fig 2: Identifying Connector Terminals Of Leak Detection Pump
    G03459031Courtesy of VOLKSWAGEN OF AMERICA, INC.
  • Measure resistance between terminals 2 + 3 of diagnostic pump.

    Specified value: 12.5...19.5 Ξ©

    If specified values are not obtained:

  • Replace Leak detection pump (LDP) -V144-, see item Β 7
  • Erase DTC memory of Engine Control Module (ECM), see DIAGNOSTIC MODE 4: RESET/ERASE DIAGNOSTIC DATA .
  • Generate readiness code, see READINESS CODE, GENERATING .

    If specified values are obtained:

  • Connect test box to control module wiring harness, see CONNECT TEST BOX FOR WIRING TEST .
  • Check wires between test box and 3-pin connector for open circuits according to wiring diagram.

    Terminal 1+socket 80

    Terminal 2+socket 25

    Wire resistance: max: 1.5 Ξ©

    • Fig 3: Identifying Connector Harness Terminals Of Leak Detection Pump
    G03459032Courtesy of VOLKSWAGEN OF AMERICA, INC.
  • Also check wires for short circuit to each other, to vehicle Ground (GND) and to B+.

    Specified value:

  • Check wire between 3 -pin connector terminal 3 and the Fuel Pump (FP) Relay -J17- for open circuit according to wiring diagram.

    Wire resistance: max: 1.5 Ξ©

    If no malfunctions are found in wires:

  • Replace Motronic Engine Control Module (ECM) -J220-, see REPLACING ENGINE CONTROL MODULE (ECM) .
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.