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KN5 - Check Vacuum Between FPRC Solenoid and FPR
- Key "OFF".
- Disconnect and inspect the vacuum hose between the Fuel Pressure Regulator Control (FPRC) solenoid output port and the fuel pressure regulator for blockage, kinks, cracks, etc.
- Is the vacuum hose in good condition?
Yes -- Reconnect the vacuum hose. Go to KN6. KN6 - Exercise the FPRC Solenoid Valve
No -- Service or replace the vacuum hose as necessary. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)