Section 06
ENGINE MANAGEMENT (DI)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
SMR2002-075 _06-03A.FM
06-03-27
Using a multimeter, recheck resistance value be-
tween terminals 9 and 11.
If resistance value is correct, try a new MPEM. Re-
fer to MPEM REPLACEMENT procedures else-
where in this section.
If resistance value is incorrect, repair the wiring
harness/connectors between AMP plug connec-
tor and the WTS.
Replacement
Remove air/fuel rail retaining screws.
Cut locking ties as necessary to allow lifting of
air/fuel rail in order to give access to the tempera-
ture sensor.
Disconnect WTS connector and remove WTS.
Apply Loctite 518 on threads of the WTS then in-
stall.
Reinstall remaining removed parts.
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 sen-
sor 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.
F12R0LB
1
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