Section 08 ENGINE MANAGEMENT (4-TEC)
Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
TOPS VALVE (BLOW-BY)
Pressure stays below
40 kPa (5.8 PSI) for 10 min.
(TOPS valve is open)
TOPS DIAGNOSTIC FLOW CHART
Connect safety
lanyard
TOPS valve opens
(short knocking noise)
Check
TOPS switch
Check output voltage
on wiring harness
Replace
TOPS valve
Lower than 8 V
Greater than 8 V
No
OK
Fails
Repair or
replace
Install engine leak test pump
gauge on oil dipstick tube
Start engine
Yes
No
Pressure drops
down directly after
reaching 40 kPa (5.8 PSI)
(TOPS valve opens again)
TOPS OK
Yes
Check
OSPS
Fails
OK
Fails
Yes
No
OK
Fails
Replace
OSPS
Retest Retest
OK
Try a new MPEM
Check
wiring harness
Retest
Working?
No
Yes
Try a new
ECM
R1503motr354S
smr2004-Complete Line Up 433
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