Section 07
ENGINE MANAGEMENT (4-TEC)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
SMR2002-078 _07_03A.FM
07-03-17
Disconnect plug connector from throttle position
sensor. To unlock connector, insert a small screw-
driver between the folded tab. To see the connec-
tor pin-out, temporarily remove the connector
shield joining the harness, to expose the pin num-
bers. Connect a voltmeter between pin 1 and 3
and also between pin 1 and 2 in the wiring har-
ness.
Remove and reinstall the safety lanyard to activate
the EMS ECU.
Check the voltage readings as follows.
If voltage test is good, replace the TPS.
If voltage test is not good, check the resistance of
the TPS circuit.
Resistance Test
Reconnect
the TPS.
Disconnect the EMS ECU connector A on the EMS
ECU.
Using a multimeter, check resistance value be-
tween terminal A-25 and A-39.
The resistance should be 1600 - 2400
Ω
.
Check the resistance between terminal A-24 and
terminal A-39 with the throttle plate in
idle
posi-
tion.
The resistance should be approximately 2500
Ω
.
Check the resistance between terminal A-24 and
terminal A-39 with the throttle plate in
wide open
position.
The resistance should be 1000 - 1100
Ω
.
Check the resistance between terminal A-24 and
A-25 with throttle plate in
idle
position.
The resistance should be 1000 - 1100
Ω
.
Now check the resistance with the throttle plate
in
wide open
position.
The resistance should be 2600 - 2700
Ω
.
NOTE:
When measuring between pins A-24 and
A-39, resistance
value decreases
while depress-
ing throttle lever. when measuring between pins
A-24 and A-25, resistance
value increases
while
depressing throttle lever. The resistance value
should change smoothly and proportionally to
throttle movement. Otherwise, replace TPS.
If resistance values are correct, try a new EMS ECU.
Refer to EMS ECU REPLACEMENT procedures
elsewhere in this section.
If resistance values are incorrect, repair connector
or replace the wiring harness between EMS ECU
connector and the TPS.
Replacement
Remove the throttle body as described above.
Loosen two screws retaining the TPS.
Remove TPS.
THROTTLE BODY
1. Throttle position sensor (TPS)
2. Screws
Apply Loctite 243 on screw threads, install the new
TPS.
Reinstall remaining removed parts.
Proceed with the
Closed Throttle and Idle Actu-
ator Reset
. See below.
CONNECTION
VOLTAGE
Pin 1 with engine ground
0 V
Pin 2 with engine ground
5 V
Pin 3 with engine ground
4.75 - 5 V
R1503motr191A
24
39
25
2
1
R1503motr168A
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Содержание GTX 4-TEC 5573 2002
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