Honda Civic. Manual — part 662

DTC P0193: FUEL RAIL PRESSURE SENSOR CIRCUIT HIGH VOLTAGE

1. Turn the ignition switch ON (II).
2. Check the FUEL RAIL PRESSURE SENSOR in the DATA LIST with the

HDS.

Is there about 4.77 V or more?

YES -Go to step 3.

NO -Intermittent failure, the system is OK at this time. Check for poor
connections or loose terminals at the fuel rail pressure sensor and the PCM.

3. Try to start the engine when the ambient temperature is 32 °F (0 °C) or more.

Does the engine start?

YES -Go to step 8.

NO -Go to step 4.

4. Turn the ignition switch OFF.
5. Disconnect the fuel pressure regulator switch 2P connector (see FUEL

PRESSURE SWITCH REPLACEMENT ).

6. Turn the ignition switch ON (II).
7. Check the LOW FUEL INDICATOR in the DATA LIST with the HDS.

Is OFF indicated?

YES -Replace fuel pressure regulator P1 (see FUEL PRESSURE
REGULATOR P1 REPLACEMENT ), then go to step 35.

NOTE:

Before you troubleshoot, record all freeze data and any on-
board snapshot, and review the general troubleshooting
information (see GENERAL TROUBLESHOOTING
INFORMATION ).

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX

NO -Repair short in the wire between the PCM (A41) and the fuel pressure
regulator switch 2P connector, the fuel shut-off solenoid valve relay. Also
replace fuel pressure regulator P1 (see FUEL PRESSURE REGULATOR P1
REPLACEMENT ). Then go to step 35.

8. Check the FUEL RAIL PRESSURE SENSOR in the DATA LIST with the

HDS, and note the value.

9. Turn the ignition switch OFF.

10. Close the manual shut-off valve.
11. Start the engine, and let it idle until it stops.
12. Check the FUEL RAIL PRESSURE SENSOR in the DATA LIST with the

HDS.

13. Compare the current value of the FUEL RAIL PRESSURE SENSOR with the

value from step 8.

Is the current value lower than the value from step 4?

YES -Go to step 14.

NO -Go to step 18.

14. Turn the ignition switch OFF.
15. Disconnect the fuel pressure regulator switch 2P connector (see FUEL

PRESSURE SWITCH REPLACEMENT ).

16. Turn the ignition switch ON (II).
17. Check the LOW FUEL INDICATOR in the DATA LIST with the HDS.

Is OFF indicated?

YES -Replace fuel pressure regulator P1 (see FUEL PRESSURE
REGULATOR P1 REPLACEMENT ), then go to step 35.

NO -Repair short in the wire between the PCM (A41) and the fuel pressure
regulator switch 2P connector, the fuel shut-off solenoid valve relay. Also
replace fuel pressure regulator P1 (see FUEL PRESSURE REGULATOR P1
REPLACEMENT ). Then go to step 35.

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX

18. Turn the ignition switch OFF.
19. Disconnect the fuel rail pressure sensor 3P connector (see FUEL PRESSURE

SWITCH REPLACEMENT ).

20. Connect fuel rail pressure sensor 3P connector terminals No. 2 and No. 3 with

a jumper wire.

Fig. 11: Connecting Fuel Rail Pressure Sensor 3P Connector Terminals
No. 2 And 3 With Jumper Wire

21. Turn the ignition switch ON (II).
22. Check the FUEL RAIL PRESSURE SENSOR in the DATA LIST with the

HDS.

Is there about 4.77 V or more?

YES -Go to step 23.

NO -Replace the fuel rail pressure sensor (see FUEL PRESSURE SWITCH
REPLACEMENT ), then go to step 35.

23. Turn the ignition switch OFF.
24. Remove the jumper wire from the fuel rail pressure sensor 3P connector.
25. Turn the ignition switch ON (II).
26. Measure voltage between fuel rail pressure sensor 3P connector terminals No.

1 and No. 3.

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX

Fig. 12: Measuring Voltage Between Fuel Rail Pressure Sensor 3P
Connector Terminals No. 1 And 3

Is there about 5 V?

YES -Go to step 27.

NO -Go to step 31.

27. Turn the ignition switch OFF.
28. Jump the SCS line with the HDS.
29. Disconnect PCM connector C (44P).
30. Check for continuity between fuel rail pressure sensor 3P connector terminal

No. 2 and PCM connector terminal C10.

Fig. 13: Checking Continuity Between Fuel Rail Pressure Sensor 3P
Connector Terminals

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX