5000S Wagon L5-2226cc 2.22L SOHC (KZ) (1985)
Pressure Gradient Switch, Checking
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connect hand vacuum pump to open hose connection on pressure gradient switch
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connect ohmmeter across both terminals of open electrical connection on pressure gradient switch
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apply vacuum to pressure gradient switch, then release vacuum from pump
^
specification: ohmmeter must briefly read 0 ohms (indicates continuity)
If spec. NOT OK
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replace pressure gradient switch and re-check
If spec. OK
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check thermo-pneumatic valve as follows
Thermo-Pneumatic Valve, Checking
Thermo-pneumatic valve, checking
Test conditions
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engine coolant temp. below approx. 10~C (50~F)
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unplug vacuum lines from valve
Note
If coolant temp. above test specs. remove valve from cylinder head and cool down separately
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connect hand vacuum pump to angled hose connection (arrow)
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temporarily seal off straight hose connection
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apply vacuum with pump
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open sealed connection
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vacuum must release
If vacuum DOES NOT release
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replace thermo-pneumatic valve