Throttle Position Sensor (TPS) - Late Style
1. Install the TPS into the throttle body.
2. Start the 2 fasteners (
A
, Figure 186) by hand. Tighten to
13 lb-in
(1.5 Nm).
186
3. Connect the wire harness connector to the TPS
connector.
Throttle Position Sensor (TPS) - Early Style
1. Install the dead idle screw with spring on to TPS. Leave
loose for later adjustment.
2. Install the TPS onto the throttle body. Start the 2
fasteners by hand. Leave loose for later adjustment.
3. See
Throttle Position Sensor (TPS) - Adjustment
for
proper adjustment and torque specification for the TPS.
Throttle Position Sensor (TPS) - Adjustment
This adjustment procedure only applies to early style
adjustable TPS. Late style TPS are non-adjustable. For TPS
identification, refer to
SECTION 4 - REMOVE EXTERNAL
ASSEMBLIES - Throttle Position Sensor (TPS)
.
NOTE:
Adjustment of the TPS requires the engine to be
running. Finish all service and repair procedures and obey all
safety messages contained in
SECTION 1 - SAFETY AND
GENERAL INFORMATION
before running the engine.
There are 2 methods for adjusting the TPS, with the
Diagnostic Tool and Software, and with a digital volt and
ohm meter (DVOM). If using the Diagnostic Tool, proceed as
follows, for DVOM adjustment skip to step 10.
1. Connect the Diagnostic Tool to the engine and open
the Diagnostic Tool Software. See the Diagnostic Tool
manual for instructions.
2. Start and run the engine at no-load idle, throttle in the
idle position.
3. 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.
4. Slew the
Idle Air Control Position (Steps)
to 0 steps.
5. Adjust the dead idle screw until the engine runs at 600
+/- 50 RPM.
6. Turn the engine off.
7. 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.
8. Alternately tighten two TPS screws to
13 lb-in
(1.5 Nm).
9. Proceed to step 14 to reset ECM memory.
Using DVOM
10. Start and run the engine at no-load idle, throttle in the
idle position.
11. Use index finger or plug to block IAC air passage.
12. While IAC air passage is blocked, adjust dead idle screw
until engine runs at 600 +/-50 RPM.
13. 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.
E. Set DVOM to read volts DC.
F. Turn Ignition ON, Engine OFF.
G. Observe voltage on DVOM.
H. With throttle resting against the dead idle screw,
rotate the TPS until the output voltage is 0.73 +/-
0.02 volts.
I.
Alternately tighten two TPS screws to
13 lb-in
(1.5
Nm).
14. Reset ECM memory as follows:
A. Turn Ignition OFF for at least 10 seconds.
B. Cycle Ignition ON and OFF five times in five
seconds.
C. End cycle in the OFF position and wait at least 10
seconds.
D. Turn Ignition ON to reset ECM memory to the default
values.
Idle Air Control Valve (IAC) - EFI
1. Install the IAC valve onto the throttle body.
143
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