4.16
FUEL INJECTION
Throttle Position Sensor Test
The throttle position sensor (TPS) is a non-serviceable item. If
it is faulty, it must be replaced. It can be tested using the
following method:
• Set up the TPS Test Adapter Harness (PU-47082),
according to the instructions. Make sure that the 9 volt
battery is new. Figure 2.
• With the test leads connected and the meter set, move
the throttle open and closed slowly while reading the
display. The voltage should increase smoothly with no
“jumps” or decreases when the throttle is applied.
• If the sensor does not function correctly, replace it.
CORRECT REFERENCE VOLTAGE
A 5 volt reference voltage from the harness is required for the
TPS test to be accurate. Refer to the instructions provided with
the TPS Test Adapter Harness (PU-47082) or follow the steps
below to check reference voltage.
• Harness Test: Insert black voltmeter probe into the
“Bk” test port.
• Connect the red meter probe into the “R” port and
verify the voltage is 4.99-5.01 Vdc. If this reading is
low, verify the 9 volt battery is good or try a new 9 volt
battery.
Throttle Position Sensor 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.
PU-47082 TPS Test
Adapter Harness
Use NEW
9V battery
PU-47082 Harness
No “Jumps” in read out
Throttle Plate
Must Be Closed
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