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Home >> Porsche >> 1987 >> 928 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - BOSCH LH >> Testing >> Test 15 - Throttle Switch (Full Load)
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Test 15 - Throttle Switch (Full Load)

  1. Pull off both EZF and LH control unit plugs. Connect ohmmeter between terminal No. 12 and ground on disconnected LH fuel control unit plug. In idle position reading should be infinite ohms. At about 2/3 throttle opening, reading should be zero 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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