Dtc P0193 - Mazda Mazda6 Workshop Manual Supplement

DTC P0193

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