Section 07
ENGINE MANAGEMENT (4-TEC)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
SMR2002-078 _07_03A.FM
07-03-23
Replacement
Unlock expansion tank and temporarily move
away to gain access.
Remove the fuel rail cover.
Disconnect CTS connector and remove CTS.
Install the new CTS and torque to 18 N•m (159
lbf•
in
).
Reinstall remaining removed parts.
MANIFOLD AIR PRESSURE
SENSOR (MAPS)
1. Manifold air pressure sensor (MAPS)
NOTE:
This sensor is a dual function device. When
engine is started and it runs at idle speed, the sen-
sor takes the atmospheric pressure and stores it in
the EMS ECU. Thereafter, it takes the manifold air
pressure at operating RPMs.
Ensure sensor is correctly installed on intake man-
ifold. Otherwise, the MAPS could generate a fault
code for an unexpected sensor range at idle when
it reads the atmospheric pressure. Remove sensor
and check for oil or dirt on its end and if problem
persists, check throttle plate condition/position
and the wiring harness. Perform the following
tests.
Voltage Test
Check the voltage output from EMS ECU to the man-
ifold air pressure sensor (MAPS).
Disconnect plug connector from maps and con-
nect a voltmeter between pin 1 and 3 and also
between pin 1 and 2 of wiring harness.
Remove and reinstall the safety lanyard to activate
the EMS ECU. There should be 5 Vdc in each test.
If voltage test is good, replace the MAPS.
If voltage test is not good, check the continuity of
the MAPS circuit.
Resistance Test
Disconnect the EMS ECU connector A on the EMS
ECU.
Using a multimeter, check continuity of circuits 12,
28 and 40.
If wiring harness is good, try a new EMS ECU.
Refer to EMS ECU REPLACEMENT procedures
elsewhere in this section.
Otherwise, repair the connectors or replace the
wiring harness between EMS ECU connector and
the MAPS.
Replacement
Disconnect MAPS connector and remove the MAPS.
Install the new MAPS paying attention to index its
tab into the adaptor notch. Apply Loctite 243 (blue)
on screw then torque to 10 N•m (89 lbf•
in
).
EXHAUST GAS TEMPERATURE
SENSOR (EGT)
1. Muffler
2. Exhaust gas temperature sensor (EGT)
1
R1503motr173A
2
F18D2IA
1
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Содержание GTX 4-TEC 5573 2002
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