Section 07
ENGINE MANAGEMENT (4-TEC)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
SMR2002-078 _07_03A.FM
07-03-25
Replacement
Remove the intake manifold. Refer to INTAKE
MANIFOLD REPLACEMENT in INTAKE section.
Unscrew and remove knock sensor.
Clean contact surface, apply Loctite 243 in thread-
ed hole then install the new knock sensor.
Torque screw to 24 N•m (18 lbf•ft).
CAUTION:
Improper torque might prevent sen-
sor to work properly and lead engine to severe
damage of internal components.
Replug connector.
OIL PRESSURE SWITCH (OPS)
1. OPS
Oil Pressure Test
To check the function of the oil pressure switch,
an oil pressure test has to be performed. Refer to
OIL PRESSURE TEST in LUBRICATION SYSTEM
section.
If the engine oil pressure is out of specifications,
check the points described in TROUBLESHOOT-
ING section.
If the engine oil pressure is good, check the resis-
tance of the OPS while engine is off and while
engine is running.
Resistance Test
Disconnect the plug connector from the OPS and
use a multimeter to check the resistance between
OPS pin and engine ground while engine is
stopped (without oil pressure) and while engine is
running (with oil pressure).
When engine is stopped the resistance is infinitely
high (normally open switch).
When engine is running and the oil pressure reach-
es 180 - 220 kPa (26 - 32 PSI), the resistance of
the OPS is close to 0
Ω
.
If resistance values are incorrect, replace OPS.
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 6.
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
OPS.
OIL SEPARATOR PRESSURE
SWITCH (OSPS)
1. OSPS
1
R1503motr194A
R1503motr195A
6
1
R1503motr189A
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