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3. With the throttle in the idle position, compare the
reading on the voltmeter to the chart. If the reading
is within prescribed specification, proceed to step 4.
Idle Position
0.710-0.818
4. Compress the throttle lever slowly to the full-open
position. The meter reading should show a smooth
rise in voltage all the way to the full-open throttle
position. If the voltage seems to be erratic or
doesn't meet the prescribed specification, repeat
this procedure several times to confirm results.
5. If the full-open throttle voltage remains erratic or
out of specification; replace the throttle body
assembly.
6. If the TPS is within the prescribed specification,
disconnect the adjustment tool harness from the
TPS. Connect the snowmobile TPS harness to the
TPS.
NOTE: Before installing the TPS harness connec-
tor, apply dielectric grease to the connector pins.
Fail-Safe Ignition Timing
Engines equipped with throttle position sensor have a
protective feature called "fail-safe" ignition timing
preventing engine damage should the TPS fail. If the
TPS does fail, the engine will run normally at low
RPM but will run poorly at high RPM allowing the
operator to get the snowmobile to safety with little or
no engine damage.
NOTE: The engine will continue to operate this
way until the TPS is replaced.
Testing Fuel Injector Resistance
1. Disconnect the fuel injector wiring harness.
2. Set the meter selector to the OHMS scale.
3. Test between the two injector terminals. Test spec-
ification is 10-14 ohms.
58
Wide-Open Position
3.472-4.048
IO031
4. If not within specifications, replace the injector.
Removing Fuel Injector
CAUTION
The fuel supply hose may be under pressure. Place an
absorbent towel around the connection to absorb fuel;
then remove the hose slowly to release the pressure.
1. Loosen the clamp securing the fuel supply hose to
the fuel rail; then remove the hose from the fuel
rail.
2. Disconnect the wiring harness from each injector.
3. Remove the screws securing the injector delivery
pipe to the throttle body assembly; then remove
the pipe from the injectors.
4. Remove the fuel injectors from the throttle body
assembly.
Installing Fuel Injector
1. Apply a light coat of oil to all O-rings; then install
the upper and lower O-rings onto each injector.
2. Install the injectors into the throttle body assembly.
3. Place the injector delivery pipe into position on the
throttle body assembly and secure with two
screws.
4. Connect the fuel delivery hose to the fuel rail and
secure with a clamp.
NOTE: When securing the fuel delivery hose,
position the clamp as shown.
CM039
CM203A
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