DTC Troubleshooting: P0193

DTC P0193: Fuel Rail Pressure Sensor Circuit High Voltage

NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P0193 Fuel Rail Pressure Sensor Circuit High Voltage

Problem verification:

Problem verification

?1.	Turn the vehicle to the ON mode, and wait 2 seconds.

?2.

Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
INPUT VOLTAGE FROM PF SENSOR	More than 4.89	V

Do the current condition(s) match the threshold?


	YES

The failure is duplicated. Go to step 2.


	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. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?

Determine possible failure area (fuel rail pressure sensor, others):

Determine possible failure area (fuel rail pressure sensor, others)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.

Disconnect the following connector.

Fuel rail pressure sensor 3P connector

?3.

Connect terminals A and B with a jumper wire.

Terminal A	Fuel rail pressure sensor 3P connector No. 1
Terminal B	Fuel rail pressure sensor 3P connector No. 2

?4.	Turn the vehicle to the ON mode.

?5.

Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
INPUT VOLTAGE FROM PF SENSOR	More than 4.89	V

Do the current condition(s) match the threshold?


	YES

Go to step 3.


	NO

Replace the fuel rail (fuel rail pressure sensor).?

Determine possible failure area (SG1 line, others):

Determine possible failure area (SG1 line, others)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Remove the jumper wire from the fuel rail pressure sensor 3P connector.

?3.	Turn the vehicle to the ON mode.

?4.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	Fuel rail pressure sensor 3P connector: disconnected
Test point 1	Fuel rail pressure sensor 3P connector No. 2
Test point 2	Fuel rail pressure sensor 3P connector No. 3

Is there about 5.0 V?


	YES

The SG1 wire is OK. Go to step 4.


	NO

Go to step 5.

Open wire check (PF line):

Open wire check (PF line)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Jump the SCS line with the HDS.

?3.

Disconnect the following connector.

PCM connector C (51P)

?4.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Fuel rail pressure sensor 3P connector: disconnected
	PCM connector C (51P): disconnected
Test point 1	Fuel rail pressure sensor 3P connector No. 1
Test point 2	PCM connector C (51P) No. 46

Is there continuity?


	YES

The PF wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P0193 goes away and the PCM was updated, troubleshooting is complete. If DTC P0193 goes away and the PCM was substituted, replace the original PCM.?


	NO

Repair an open in the PF wire between the PCM (C46) and the fuel rail pressure sensor.?

Open wire check (SG1 line):

Open wire check (SG1 line)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Jump the SCS line with the HDS.

?3.

Disconnect the following connector.

PCM connector C (51P)

?4.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Fuel rail pressure sensor 3P connector: disconnected
	PCM connector C (51P): disconnected
Test point 1	Fuel rail pressure sensor 3P connector No. 2
Test point 2	PCM connector C (51P) No. 42

Is there continuity?


	YES

The SG1 wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P0193 goes away and the PCM was updated, troubleshooting is complete. If DTC P0193 goes away and the PCM was substituted, replace the original PCM.?


	NO

Repair an open in the SG1 wire between the PCM (C42) and the fuel rail pressure sensor.?