4.17
ELECTRONIC FUEL INJECTION
4
TEMPERATURE / BAROMETRIC AIR
PRESSURE SENSOR (T-BAP)
Operation Overview
Mounted on the throttle body intake, the temperature and
barometric air pressure sensor (T-BAP) performs two functions
in one unit.
Air passing through the intake is measured by the T-BAP and
relayed to the ECU. These signals, comprised of separate air
temperature and barometric air pressure readings, are processed
by the ECU and compared to its programming for determining
the fuel and ignition requirements during operation.
T-BAP Test
The temperature and barometric air pressure sensor (T-BAP) is
a non-serviceable item. If it is faulty, it must be replaced. This
sensor requires a 5 Vdc input to operate, therefore the T-BAP
sensor should only be tested using the Digital Wrench™
Diagnostic Software (dealer only). Refer to the EFI Diagnostic
Software Manual for more information.
T-BAP Replacement
1. Disconnect sensor from engine harness.
2. Using a 10mm wrench, remove the retaining bolt and
replace the sensor, using a light coating of oil on the o-ring
to aid installation.
3. Torque the retaining bolt to specification.
THROTTLE POSITION SENSOR (TPS)
Operation Overview
The throttle position sensor (TPS) is used to indicate throttle
plate angle to the ECU.
Mounted on the throttle body and operated directly off the end
of the throttle shaft, the TPS works like a rheostat, varying the
voltage signal to the ECU in direct correlation to the angle of the
throttle plate. This signal is processed by the ECU and compared
to the internal pre-programmed “maps” to determine the
required fuel and ignition settings for the amount of engine load.
TPS Tester / Regulator
The throttle position sensor (TPS) reading can be checked by
using the TPS Tester Adapter Harness (PU-47082) and TPS
Tester Regulator (4010264).
= T
T-BAP Retaining Bolt Torque:
29 in. lbs. (3.3 Nm)
The correct position of the throttle body
stop screw is established and set at the
factory. DO NOT loosen the throttle body
stop screw or alter its position in any
manner. The stop screw controls the air
flow calibration of the throttle body. If the
stop screw is repositioned or adjusted, the
throttle body assembly must be replaced.
TPS Connector
Throttle Body
Stop Screw
(Factory Set)
Yellow
(Output)
Blue
(Input)
Black
(Ground)
TPS
DO NOT ADJUST
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