Section 05
ENGINE MANAGEMENT (DI)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
05-03-24
SMR2000-051-05-03A.FM
MANIFOLD AIR PRESSURE
SENSOR (MAPS)
MAG SIDE THROTTLE BODY
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 MPEM. Thereafter, it takes the
manifold air pressure at operating RPMS.
Ensure sensor is correctly installed elbow adaptor.
Otherwise, the MAPS could generate a fault code
for an unexpected sensor range at idle when it
reads the atmospheric pressure. Ensure the cor-
rect connector is plugged and not mixed with the
MAG TPS. 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 MPEM to the mani-
fold air pressure sensor (MAPS).
Disconnect plug connector from throttle position
sensor and connect 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 MPEM. 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 AMP plug connector number 3 on
the MPEM.
Using a multimeter, check continuity of circuits 3-3,
3-6 and 3-7.
If wiring harness is good, try a new MPEM. Refer
to MPEM replacement procedures elsewhere in
this section.
Otherwise, repair the wiring harness/connectors
between AMP plug connector and the MAPS.
Replacement
Remove the air intake silencer.
Remove the air duct.
Disconnect MAPS connector and remove the
MPAS.
Install the new MAPS paying attention to index its
tab into the adaptor notch.
Reinstall remaining removed parts.
EXHAUST GAS TEMPERATURE
SENSOR (EGT)
1. Muffler
2. Exhaust gas temperature sensor (EGT)
F12R0LB
1
2
F12R0SA
1
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