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Home >> Mazda >> 2017 >> CX-5 Grand Select, AWD >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic - Engine Control System (1 Of 5) >> DTC P0193-00: Fuel Pressure Sensor Circuit High Input >> Diagnostic Procedure
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Diagnostic Procedure

DIAGNOSTIC PROCEDURE DESCRIPTION

STEP INSPECTION RESULTS ACTION
1 RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION
NOTE:
  • Recording can be facilitated using the screen capture function of the PC.
  • Record the FREEZE FRAME DATA/snapshot data on the repair order.
 - Go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY
  • Verify related Service Bulletins and/or on-line repair information availability.
  • Is any related repair information available?
 Yes Perform repair or diagnosis according to the available repair information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 DETERMINE IF FUEL PRESSURE SENSOR OR WIRING HARNESS MALFUNCTION Yes Go to Step 7.
No Go to the next step.
4 INSPECT FUEL PRESSURE SENSOR CONNECTOR CONDITION
  • Switch the ignition off.
  • Disconnect the fuel pressure sensor connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the connector and/or terminals, then go to Step 10.
No Go to the next step.
5 INSPECT PCM CONNECTOR CONDITION
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the connector and/or terminals, then go to Step 10.
No Go to the next step.
6 INSPECT FUEL PRESSURE SENSOR Yes Replace the fuel distributor, then go to Step 10.
(See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
No Go to Step 10.
7 DETERMINE IF FUEL PRESSURE SENSOR SIGNAL CIRCUIT OR FUEL PRESSURE SENSOR GROUND CIRCUIT MALFUNCTION Yes Go to the next step.
No Go to Step 9.
8 INSPECT FUEL PRESSURE SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT
  • Verify that the fuel pressure sensor connector is disconnected.
  • Switch the ignition off.
  • Disconnect the PCM connector.
  • Inspect for continuity between fuel pressure sensor terminal B (wiring harness-side) and PCM terminal 1CA (wiring harness-side).
  • Is there continuity?
 Yes Refer to the wiring diagram and verify whether or not there is a common connector between fuel pressure sensor terminal B and PCM terminal 1CA.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
  • Repair or replace the malfunctioning part.

If there is no common connector:
  • Repair or replace the wiring harness which has a short to power supply.

Go to Step 10.
No Refer to the wiring diagram and verify whether or not there is a common connector between fuel pressure sensor terminal B and PCM terminal 1CA.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
  • Repair or replace the malfunctioning part.

If there is no common connector:
  • Repair or replace the wiring harness which has an open circuit.

Go to Step 10.
9 INSPECT FUEL PRESSURE SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
  • Verify that the fuel pressure sensor connector is disconnected.
  • Switch the ignition off.
  • Disconnect the PCM connector.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Fuel pressure sensor terminal C-PCM terminal 1BJ
      • Fuel pressure sensor terminal A-PCM terminal 1CB
  • Is there continuity?
 Yes Replace the fuel distributor, then go to the next step.
(See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
No Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Fuel pressure sensor terminal C-PCM terminal 1BJ
  • Fuel pressure sensor terminal A-PCM terminal 1CB

If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
  • Repair or replace the malfunctioning part.

If there is no common connector:
  • Repair or replace the wiring harness which has an open circuit.

Go to the next step.
10 VERIFY DTC TROUBLESHOOTING COMPLETED Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
11 VERIFY AFTER REPAIR PROCEDURE Yes Go to the applicable DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .)
No DTC troubleshooting completed.
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