4.18
FUEL INJECTION
3. If voltage varies with throttle movement, continue on to
step 3 and measure the idle air flow reading. If the sensor
does not function correctly, replace it.
4. With voltmeter still attached to the TPS Test Adapter
Harness (PU-47082) as shown below, the voltmeter should
read .710 ± .01 volts at idle position.
5. If the voltage does not read within the specification,
“TPS Initialization” will need to be performed.
TPS Initialization
NOTE: The correct position of the TPS is
established and set at the factory. Use this
procedure only if the TPS was repositioned,
replaced or loosened.
STEP 1
Establishing zero offset voltage: This step is crucial as it sets
the TPS position using a fixed physical stop. This will insure
that the correct offset voltage is reached once the correct throttle
body flow is set.
• Remove cover and disconnect throttle cable from
throttle cam.
• With engine off, back out air flow screw until it no
longer is in contact with throttle plate cam. The throttle
plate should seal off throttle bore completely.
• Open and close throttle plate a couple of times to ensure
full throttle closing. Do not snap closed, as this could
cause unnecessary throttle plate to throttle body
interference and/or damage.
• Set up the TPS Test Adapter Harness (PU-47082)
according to the instructions. Verify that the 9 volt
battery is new. See illustration below.
• Using a voltmeter attached to the TPS Tester Harness
(PU-47082), check the voltage output of the TPS. It
should read .528 .01 volts.
• If it does not read .528 .01 volts, loosen the screw
holding the TPS to the throttle body. Rotate TPS until
voltmeter reads .528 .01 volts.
• Retighten TPS mounting screw, and verify the voltage
did not change. If changed, repeat the previous steps.
TPS Tester Adapter
Harness- PU-47082
Should Read: .710 V
.710
Throttle Plate
Must Be Closed
Back Air Flow Screw Out
Until No Contact is Made
TPS Tester Adapter
Harness- PU-47082
.528
Should Read: .528 V
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