Polaris Virage TX 2000 Service Manual page 292

FFI™ FUEL INJECTION
Action Steps - Fuel System
Step 2: Check Fuel Pump. Connect a 100 psi (690 kPa)
gauge to pressure tap on fuel injector line. Ensure fuel
pressure gauge is installed correctly.
A. Remove 8-pin connector from rear of EMM
and connect FFI ™ EMM Service Power Con
nector (PN 2872456). Initiate "Fuel Pump Test"
using FFI ™ Diagnostic Software while monitor
ing pressure. Pump will run for 7 seconds.
Results:
• 20-30 psi (138-207 kPa) - OK. Check Fuel
Injection System operation, Step 4.
• Pump won't run - check breather.Go to Step
B or refer to Diagnostic Guide.
B. Check for battery voltage at fuel pump Red/White lead while initiating "Fuel Pump Test" using FFI ™
Diagnostic Software.
Results:
• Battery voltage - OK. Check CPS - Check for ground at brown wire at fuel pump while
initiating fuel pump test. Replace fuel pump
Fuel Injection System
NOTE: Many of the following tests involve probing along side the wire in a connector. Never pierce wire insula
tion. Lightly lubricate probe and use extreme care not to damage wire seal in connector.
Step 3: Injector Static Test.
A. Use FFI™ Diagnostic Software to actuate injectors while listening for an audible click. See Software
User's Guide, Chapter 9.
Results:
• No injectors fire - perform voltage supply tests. See Step 5.
• All injectors react correctly, and consistently - Test finished.
• Some injectors do not operate - Monitor EMM signal lead at injector using an inductive
timing light. Be sure to clip onto only one wire per injector.
NOTE: Some timing lights may not flash consistently during cranking. Timing light pickup orientation can also
affect results, and should be tried both ways. Any flashes in either case indicate injector and its signal are probably
okay. Verify by testing with engine running.
• Light flashes indicating signal is OK - Suspect injector. Perform Drop test - replace injec
tor
• Light does not flash - suspect an open circuit in either the injector coil, signal lead, or a
damaged EMM.
Step 4: Injector Dynamic Test.
A. Monitor voltages using FFI™ Diagnostic Software while performing the following tests. If voltages
drop as RPM increases, test charging system as outlined in this section.
While running (as problem is occurring) or cranking engine, monitor EMM signal lead at each injector using an
inductive timing light. Be sure to clip onto only one wire per injector
Results:
• Regular/steady light on all injectors and voltages are steady - OK. Go to Conclusion
• Irregular or no firing on some injectors - suspect crank position sensor; low voltage; dam
aged injector; open circuit; or damaged EMM. Go to Step 5.
• No injectors fire - suspect crankshaft position sensor, stator connections, or EMM. Go
to Step 5.
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