Pickup 2WD L4-2.3L (4ZD1) (1988)
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Secondary Diaphragm: Testing and Inspection
Fig. 17 Inspecting Secondary Throttle Diaphram
1.
Push in the rod of the diaphragm chamber with a finger.
2.
Block the hole of the diaphragm chamber and check to see if the diaphragm rod does not move.
3.
If diaphragm rod moves, disassemble unit and check for any problems with the sealing surfaces. If not repairable, replace diaphragm.
