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7A–20 AUTOMATIC TRANSMISSION (4L30–E) Chart 15a: Possible Causes of Low Line Pressure Step Action Yes No 1 Check oil level. Was the problem found? Fill with ATF. Go to Step 2 2 Check for defective throttle position sensor. Was the problem found? Replace throttle position sensor. Go to Step 3 3 Check for plugged, loose, or damaged oil filter (79). Was the problem found? Inspect oil filter, tighten bolts or replace oil filter (79). Go to Step 4 4 Check for a stuck force motor plunger (404). (Adapter case valve Was the problem found? Replace force (404). Go to Step 5 5 Check for a stuck feed limit valve (412). (Adapter case valve body) Was the problem found? Replace feed limit valve (412). Go to Step 6 6 Check for loose converter bolts (4 & 5). Was the problem found? Tighten converter bolts (4 & 5). Go to Step 7 7 Check for a stuck pressure regulator valve (208). (Oil pump) Was the problem found? Replace pressure regulator valve (208). Go to Step 8 8 Check for a stuck boost valve (205). (Oil pump) Was the problem found? Replace boost valve (205). Go to Step 9 9 Check for blocked intermediate oil passages to pressure Was the problem found? Replace oil pump. Go to Step 10 10 Check for defective oil pump (9, 201, 202 & 209). Was the problem found? Replace oil pump. Go to Step 11 11 Check for internal leaks. – Check balls missing or out of location in valve bodies Was the problem found? Install balls, or correct ball location. Replace seals. Replace gaskets. — |