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Home >> Porsche >> 1985 >> 928 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - BOSCH LH >> Testing >> Test 15 >> Throttle Switch (Full Load)
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Throttle Switch (Full Load)

  1. Pull off both EZF and LH control unit plugs. Connect ohmmeter between terminal 12 and ground on disconnected LH control unit plug. In idle position reading should be infinite ohms. At about 2/3 throttle opening, reading should be 0 ohms.
  2. Full load contact switches in full throttle enrichment and turns off oxygen sensor. If circuit is open, engine will be too lean with poor power output. If circuit is grounded, engine will run rich with high fuel consumption.
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