5000CD Turbo (Canada) L5-2144cc 2.14L SOHC Turbo (KH) (1984)
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squeeze pump handle several times to compress diaphragm in pressure gradient switch
FIGURE 4
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release vacuum by pressing lever (arrow as in Fig. 4)
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when releasing vacuum, ohmmeter should go to zero ohms for a short time and go back again to infinity ohms
If NO, replace pressure gradient switch.