Section 05 ENGINE MANAGEMENT
Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
If resistance value is incorrect, repair the connec-
tors or replace the wiring harness between ECM
ECU connector and the CTS.
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)
R1503motr329A
1
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 sensor takes the atmospheric pressure and
stores it in the ECM 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 sen-
sor and check for oil or dirt on its end and if prob-
lem persists, check throttle plate condition/posi-
tion and the wiring harness. Perform the follow-
ing tests.
Voltage Test
Check the voltage output from ECM ECU to the
manifold air pressure sensor ( MAPS).
Disconnect connector from MAPS and connect a
voltmeter to the terminals of the wiring harness
as per the following table.
CONNECTION VOLTAGE
Terminal 1 with engine ground 5V
Terminal 2 with engine ground 0V
Terminal 3 with engine ground 0V
Remove and reinstall the tether cord cap to acti-
vate the ECM ECU.
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 ECM ECU connector A on the
ECM ECU.
Using a multimeter, check continuity of circuits 12,
28 and 40.
If wiring harness is good, try a new ECM ECU.
Refer to ECM ECU REPLACEMENT procedures
elsewhere in this section.
Otherwise, repair the connectors or replace the
wiring harness between ECM 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(89lbf•in).
Te m pla te 201
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