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Home >> Mazda >> 2022 >> CX-5 S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (On-Board Diagnostic - Engine Control System (VIN Y) (7 Of 7)) >> DTC P2541-00: Low Fuel Pressure Sensor Circuit Low Input >> Diagnostic Procedure

Diagnostic Procedure

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DTC P2541-00: (PCM, VIN Y) DIAGNOSTIC PROCEDURE

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 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 INSPECT LOW FUEL PRESSURE SENSOR/FUEL TEMPERATURE SENSOR CONNECTOR CONDITION
  • Switch the ignition off.
  • Disconnect the low fuel pressure sensor/fuel temperature 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 9.
No Go to the next step.
4 INSPECT LOW FUEL PRESSURE SENSOR CIRCUIT FOR SHORT TO GROUND
  • Verify that the low fuel pressure sensor/fuel temperature sensor connector is disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:
    • Low fuel pressure sensor/fuel temperature sensor terminal A
    • Low fuel pressure sensor/fuel temperature sensor terminal D
  • Is there continuity?
 Yes Disconnect the PCM connector and inspect the wiring harness for short to ground.
  • If the short to ground circuit could be detected in the wiring harness:
    • Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Low fuel pressure sensor/fuel temperature sensor terminal A-PCM terminal 1CE
  • Low fuel pressure sensor/fuel temperature sensor terminal D-PCM terminal 1M

    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 ground.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to ground.
  • If the short to ground circuit could not be detected in the wiring harness:

Go to Step 9.
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 9.
No Go to the next step.
6 INSPECT LOW FUEL PRESSURE SENSOR SIGNAL CIRCUIT AND GROUND CIRCUIT FOR SHORT TO EACH OTHER
  • Verify that the low fuel pressure sensor/fuel temperature sensor and PCM connectors are disconnected.
  • Inspect for continuity between low fuel pressure sensor/fuel temperature sensor terminals D and C (wiring harness-side).
  • Is there continuity?
 Yes Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Low fuel pressure sensor/fuel temperature sensor terminal D-PCM terminal 1M
  • Low fuel pressure sensor/fuel temperature sensor terminal C-PCM terminal 1CR

    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 each other.
  • Repair or replace the malfunctioning part. If there is no common connector:
  • Repair or replace the wiring harness which has a short to each other.

Go to Step 9.
No Go to the next step.
7 INSPECT LOW FUEL PRESSURE SENSOR POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
  • Verify that the low fuel pressure sensor/fuel temperature sensor and PCM connectors are disconnected.
  • Inspect for continuity between low fuel pressure sensor/fuel temperature sensor terminal A (wiring harness-side) and PCM terminal 1CE (wiring harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Refer to the wiring diagram and verify whether or not there is a common connector between low fuel pressure sensor/fuel temperature sensor terminal A and PCM terminal 1CE.
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 9.
8 INSPECT LOW FUEL PRESSURE SENSOR
 Yes Replace the low fuel pressure sensor/fuel temperature sensor, then go to the next step.
(See LOW FUEL PRESSURE SENSOR/FUEL TEMPERATURE SENSOR REMOVAL/INSTALLATION [VIN Y] ).
No Go to the next step.
9 VERIFY DTC TROUBLESHOOTING COMPLETED
 Yes Repeat the inspection from Step 1.

Go to the next step.
No Go to the next step.
10 VERIFY AFTER REPAIR PROCEDURE
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [PCM (VIN Y)] ).
No DTC troubleshooting completed.
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