Section 08
ENGINE MANAGEMENT (4-TEC)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
08-03-28
SMR2003_027 _08_03A.FM
TOPS Pressure Test
To check the function of the OSPS (oil separator
pressure sensor), disconnect the TOPS valve and
perform a TOPS pressure test as follows.
Remove oil dipstick from engine.
Using appropriate tubes, install the engine leak
test pump (P/N 529 021 800) on dipstick tube. En-
sure to have a tight fit.
Start engine. Spray soapy water on the tubes from
the pump to the dipstick tube to ensure there is
no leak. If so, correct the leak before measuring
the pressure.
If the engine blow-by pressure does not reach
40 kPa (6 PSI), check the points described in the
following flow chart.
Stop engine and wait 30 seconds to let pressure
drop before removing tubes and pump from dip-
stick tube.
Otherwise, check the resistance of the OSPS
while engine is off and while engine is running.
Resistance Test
Disconnect the connector from the OSPS and use
a multimeter to check the resistance between
OSPS terminal and engine ground while engine is
stopped (without blow-by pressure) and while en-
gine is running (with blow-by pressure).
When engine is stopped and the blow-by pressure
is released, the resistance of the OSPS is close to
0
Ω
(normally closed switch).
When engine is running and the blow-by pressure
exceeds 40 kPa (6 PSI), the resistance is infinitely
high.
If resistance values are incorrect, replace OSPS.
If the values are correct, check the continuity of
the wiring harness.
Disconnect the EMS ECU connector A from the
EMS ECU and check continuity of circuit 31.
If wiring harness is good, try a new EMS ECU. Re-
fer to EMS ECU REPLACEMENT procedures else-
where in this section.
Otherwise, repair the connector or replace the wir-
ing harness between EMS ECU connector and
OSPS.
WARNING
The TOPS system might be pressurized.
When the TOPS valve is disconnected from
the wiring harness, never open the oil filler
cap. Stop the engine and wait at least 30 sec-
onds before opening it, to release the pres-
sure.
WARNING
Stop the engine and wait at least 30 seconds
before removing the pump and tubes, so that
pressure drops.
R1503motr198A
31
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