KN1 - DTC 554, Enter Output State Diagnostic Test Mode

Diagnostic Trouble Code (DTC) 554 indicates a failure in the Fuel Pressure Regulator Control (FPRC) solenoid circuit.

Possible causes:

- Damaged FPRC solenoid.

- Damaged vacuum hose(s).

- Open in harness.

- Short (to power or ground) in harness.

- Damaged Powertrain Control Module (PCM).

- Key "ON", engine "OFF".

- Enter Output State test mode. Output State Diagnostic Test Mode

- Disconnect FPRC solenoid.

- Connect Digital Volt/Ohm Meter (DVOM) positive test lead to VPWR pin and negative test lead to FPRC circuit at the FPRC solenoid vehicle harness connector.

- DVOM on 20 volt scale.

- While observing DVOM, depress and release throttle several times to cycle solenoid output.

- Does FPRC solenoid output voltage change greater than 1.0 volt?


Yes -- Reconnect FPRC solenoid. Go to KN2. KN2 - Check FPRC Vacuum Hose To Manifold Source

No -- Exit Output State test mode. Go to KN6. KN6 - Check FPRC Solenoid VPWR