Volkswagen Workshop Service and Repair Manuals

Checking function

Special tools, testers and auxiliary items

• ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
• ◆ Adapter set V.A.G 1594

Test sequence

• ‒ → Pull 2 pin connector -1- to partial throttle switch (F166).
• ‒ Carry out resistance measurement to partial throttle switch contacts using hand multimeter V.A.G 1526.
       Specification:
       Switch open (injection pump lever on idling speed stop): ∞ω
       Switch closed (injection pump lever towards full throttle): 0ω

Adjusting partial throttle switch

Special tools, testers and auxiliary items

• ◆ Glow plug with 12 mm hexagon drive or equivalent distance piece

Work sequence

Notes:

• ◆ The partial throttle switch switching points are set by the manufacturer on a pump test stand and must not be altered.
• ◆ Adjust new switch as follows until more precise details are produced.

• ‒ → Operate injection pump lever and clamp 12 mm hexagon drive of glow plug between stop -arrow 1- and lower edge of operating lever -arrow 2-.
• ‒ Press operating lever securely against glow plug -arrow 3- and in this position adjust partial throttle switch by sliding in elongated holes so that the switch point (switch clicks) is just behind heighest point on curved plate -arrow 4-.

Note:

The upper partial throttle switch cover is shown removed so that switch point on illustration is clearer.