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Section 04 ENGINE MANAGEMENT (1503 4-TEC)
Subsection 03 (COMPONENT INSPECTION, REPLACEMENT AND ADJUSTMENT)
1
R1503motr179A
TYPICAL — 4-TEC NATURALLY ASPIRATED AND
SUPERCHARGED ENGINES
1. TOPS valve
R1503motr351A
1
TYPICAL — 4-TEC SUPERCHARGED INTERCOOLED ENGINE
1. TOPS valve
Resistance Test
Disconnect the connector from the TOPS valve
and check the resistance of the solenoid itself.
The resistance should be between 1.27
and
2.47
.
Otherwise, replace the TOPS valve.
Dynamic Test
Activate the TOPS valve by installing the safety
lanyard on the DESS post.
If you can hear the movement of the piston (knock-
ing), the valve works fine, otherwise follow the
procedure shown in the following chart.
NOTE:
Take into account that you could hear the
piston movement and the valve might not be
working properly. The retaining washer could be
unlocked from the piston shaft. Disassembly will
reveal its condition.
Replacement
Refer to the
1503 4-TEC ENGINE SHOP MANUAL
.
OIL SEPARATOR PRESSURE
SENSOR (OSPS)
1
R1503motr189A
1. OSPS
Limp Home Mode due to OSPS
Malfunction
When OSPS loses its ground and does not close,
fault code P1202 is activated after 3 to 5 minutes
of operation and engine goes into the 5000 RPM
limp home mode.
Proceed in this order prior to assume the OSPS is
defective:
– Check if TOPS valve is turned on while safety
lanyard is installed on the DESS post. If not,
inspect TOPS valve.
smr2005-013
129
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