5
131
TPS
NOTE:
See Figure 31. The late style non adjustable
TPS (
A
) can be identified by the round screw holes (
B
)
in the mounting flange, whereas the early style TPS (
C
)
is slotted (
D
), so that the unit can be rotated if using a
DVOM for adjustment. Engines with the late style TPS
may also come equipped with a tamper proof TORX idle
set screw.
31
Non Adjustable TPS (Late Style)
Removal
1. See
Throttle Body, Removal
.
2. Remove two Phillips screws to release TPS from
throttle body.
Installation
1. Install two Phillips screws to fasten TPS to throttle
body. Alternately tighten screws to
10-16 lb-in
(1-2
Nm).
2. See
Throttle Body, Installation
.
Adjustable TPS (Early Style)
Removal/Installation/Adjustment
1. See
Throttle Body, Removal
.
2. Remove two Phillips screws to release TPS from
throttle body. See A and B of Figure 30.
3. Remove dead idle screw with spring from throttle
4. Mark throttle plate position for ease of installation.
See D of Figure 30.
5. Remove two screws to release throttle plate. See E of
6. Rotate throttle, so that lever contacts the dead idle
screw boss. See F of Figure 30.
7. Install two Phillips screws to fasten
new
TPS to
throttle body, but leave loose for later adjustment.
8. Apply Loctite 271 or equivalent to two throttle plate
screws. Install screws to fasten throttle plate to
throttle body. Alternately tighten screws to
8 lb-in
(1.0
Nm).
9. Install dead idle screw with spring, but leave loose for
later adjustment.
NOTE:
If Diagnostic Tool is not available, use DVOM
and follow instructions beginning at step 20.
Using Diagnostic Tool (Part No. 19636)
10. See
Throttle Body, Installation,
steps 1-9.
11. Run the engine at no load idle, throttle in the idle
position.
12. See H1 of Figure 30. Using the Diagnostic Tool,
select the
Dashboard
icon in the left sidebar to view
the
Dealer
tab. Select the
Test Procedures
tab in
the lower left corner.
13. See H2 of Figure 30. Slew the
Idle Air Control
Position (Steps)
to 0 steps.
14. Adjust the dead idle screw until the engine runs at
600 +/- 50 RPM.
15. Turn the engine off.
16. See H3 of Figure 30. Close the
Test Procedures
tab, and with the throttle resting against the dead idle
screw, use the software to adjust the
TPS Voltage
to
0.73 +/- .02 volts.
17. Alternately tighten two TPS screws to
10-16 lb-in
(1-2
Nm).
18. Install access cover. See
Access Cover/Blower
Housing, Installation
, steps 7-10.
19. Proceed to step 25 to reset ECM memory.
Using DVOM
20. See
Throttle Body, Installation
, steps 1-4.
21. Run engine at no load idle, throttle in the idle position.
22. Use index finger or plug to block IAC air passage.
See I of Figure 30.
23. While IAC air passage is blocked, adjust dead idle
screw until engine runs at 600 +/-50 RPM.
24. Turn engine OFF and proceed as follows:
A. Back probe terminal 3 (Pink/Black wire) of TPS
connector.
B. Connect terminal 3 back probe to red meter test
lead on DVOM.
C. Back probe terminal 2 (Brown wire) of TPS
connector.
D. Connect terminal 2 back probe to black meter
test lead on DVOM.
Not for
Reproduction
Summary of Contents for VANGUARD M490000
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