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Open Loop-1 Check

  1. Coolant temperature should be below 100° F. If not, remove vacuum hose from yellow vacuum switch and apply 5 to 10 in. Hg vacuum to switch and proceed.
  2. Start engine and run at 1500 RPM. At the end of initialization period (approximately 40 seconds, but may vary if engine is hot) metering pins should not move.
  3. Release vacuum to yellow vacuum switch and pins should now move. If system works properly, continue with diagnostic checks. If not, perform Open Loop-1 Test sequence.
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