Golf L4-1896cc 1.9L DSL Turbo (1Z) (1997)
EGR Wide Open Throttle Valve: Testing and Inspection
Special Tools, Testers And Auxiliary Items:
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Fluke 83 multimeter (or equivalent)
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VW1594 connector test kit
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12 mm hex drive and glow plug or equivalent spacer
Test Sequence:
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Disconnect 2-pin harness connector -1- from EGR part throttle switch -F166-.
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Measure resistance between EGR part throttle switch terminals using multimeter.
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Switch open (pump lever on idle speed stop): infinite ohms.
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Switch closed (pump lever toward WOT): 0 ohms.
Adjusting:
NOTE: The EGR part throttle switch, switch points are set by the manufacturer on a test stand and must not be altered.
Adjust new switches as follows:
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Operate injection pump lever and clamp 12 mm hex drive of glow plug between stop (arrow-1-) and lower edge of operating lever (arrow -2-).
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Press operating lever securely against glow plug (arrow -3-). In this position, adjust EGR part throttle switch by sliding unit in elongated holes
until switch point (switch clicks) is just behind highest point on curved plate (arrow -4-).
NOTE: The upper EGR part throttle switch cover is shown removed to make the illustrated switch point more clear.