5.38
Section 5
EFI Fuel System
6. ECU
7. Vehicle safety interlocks, ground signal on safety
wire.
Diagnostic Aid #7 FUEL SYSTEM ELECTRICAL
(no fuel delivery)
Possible causes:
1. No fuel
2. Air in high pressure fuel line
3. Fuel valve shut OFF
4. Fuel fi lter/line plugged
5. Injector circuit(s), pin circuits Black 5 and Black 6
6. Injector
7. ECU grounds
8. ECU
9. Li pump not working
Diagnostic Aid #8 FUEL SYSTEM
(fuel pressure)
Possible causes for low fuel system pressure:
1. Low fuel
2. Fuel fi lter plugged
3. Fuel supply line plugged
4. Li fuel pump - insuffi cient fuel supply
5. Fuel pump (li or module) - internally plugged
Possible causes for high fuel system pressure:
1. Pressure regulator not functioning properly
inside fuel pump module.
Diagnostic Aid #9 BASIC ENGINE
(cranks but will not run)
Possible causes:
1. Refer to basic engine troubleshooting charts
within service manual sections 3, 5, and 7.
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