Mazda Mazda6 - Dtc P0193

ON-BOARD DIAGNOSTIC
F2–127
F2
DTC P0193
A6E407001082223
Diagnostic procedure
DTC P0193 Fuel pressure sensor circuit high input
DETECTION
CONDITION
• PCM monitors input voltage from fuel pressure sensor while engine is running. If input voltage from fuel
pressure sensor is above 4.8 V, PCM determines fuel pressure sensor circuit high input.
POSSIBLE
CAUSE
• Fuel pressure sensor malfunction
• Connector or terminal malfunction
• Fuel pressure sensor power and signal circuits short each other
• Open circuit in wiring between fuel pressure sensor terminal B and PCM terminal 61
• Open circuit in wiring between fuel pressure sensor terminal A and PCM terminal 91
• PCM malfunction
STEP INSPECTION ACTION
1 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any related repair information available?
Yes Perform repair or diagnosis according to available Service
Information.
• If vehicle is not repaired, go to next step.
No Go to next step.
2 INSPECT POOR CONNECTION OF FUEL
PRESSURE SENSOR CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there any malfunction?
Yes Repair or replace suspected terminal, go to Step 7.
No Go to next step.
3 INSPECT FUEL PRESSURE SENSOR CIRCUIT
FOR SHORT WITH EACH OTHER
• Turn engine switch to OFF.
• Inspect continuity between fuel pressure
sensor terminals C and B
• Is there continuity?
Yes Repair or replace harness for short with each other, go to
Step 7.
No Go to next step.
4 INSPECT FUEL TEMPERATURE SENSOR
• Inspect fuel temperature sensor.
(See F2–77 FUEL TEMPERATURE SENSOR
INSPECTION)
• Is there any malfunction?
Yes Repair supply pump, go to Step 7.
(See F2–54 SUPPLY PUMP INSPECTION)
No Go to next step.
5
3
6
2
5
4
3
6
2
2
5
FUEL PRESSURE SENSOR
C
B
A
90
61
91
PCM
C
B
A
91
90
61
FUEL PRESSURE SENSOR
HARNESS SIDE CONNECTOR
PCM
HARNESS SIDE CONNECTOR