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Home >> Mazda >> 2022 >> CX-5 Turbo Signature >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (On-Board Diagnostic - Engine Control System (VIN M) (4 Of 7)) >> DTC P055F-00: Engine Oil Pressure Malfunction >> Diagnostic Procedure

Diagnostic Procedure

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DTC P055F-00: (PCM, VIN M) 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 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 INSPECT ENGINE OIL LEAKAGE
  • Start the engine.
  • Verify that there is no engine oil leakage in the hydraulic circuit.
  • Is there any leakage?
 Yes Repair or replace the malfunctioning part according to the inspection results, then add genuine engine oil. (See ENGINE OIL REPLACEMENT [VIN M] ).
Go to the Step 13.
No Go to the next step.
4 INSPECT ENGINE OIL LEVEL
 Yes Go to the next step.
No Add genuine engine oil.
(See ENGINE OIL REPLACEMENT [VIN M] ).
Go to the Step 13.
5 INSPECT ENGINE OIL TEMPERATURE SENSOR/ENGINE OIL PRESSURE SENSOR CONNECTOR CONDITION
  • Disconnect the engine oil temperature sensor/engine oil 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 13.
No Go to the next step.
6 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 13.
No Go to the next step.
7 INSPECT ENGINE OIL TEMPERATURE SENSOR/ENGINE OIL PRESSURE SENSOR CIRCUIT FOR SHORT TO GROUND
  • Verify that the engine oil temperature sensor/engine oil pressure sensor and PCM connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:
    • Engine oil temperature sensor/engine oil pressure sensor terminal A
    • Engine oil temperature sensor/engine oil pressure sensor terminal D
      • Engine oil temperature sensor/engine oil pressure sensor terminal C
  • Is there continuity?
 Yes Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Engine oil temperature sensor/engine oil pressure sensor terminal A-PCM terminal 1D
  • Engine oil temperature sensor/engine oil pressure sensor terminal D-PCM terminal 1AS
  • Engine oil temperature sensor/engine oil pressure sensor terminal C-PCM terminal 1AB

    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.

    Go to Step 13.
No Go to the next step.
8 INSPECT ENGINE OIL TEMPERATURE SENSOR/ENGINE OIL PRESSURE SENSOR CIRCUIT FOR OPEN CIRCUIT
  • Verify that the engine oil temperature sensor/engine oil pressure sensor and PCM connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Engine oil temperature sensor/engine oil pressure sensor terminal A-PCM terminal 1D
    • Engine oil temperature sensor/engine oil pressure sensor terminal D-PCM terminal 1AS
      • Engine oil temperature sensor/engine oil pressure sensor terminal C-PCM terminal 1AB
      • 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 the following terminals:
  • Engine oil temperature sensor/engine oil pressure sensor terminal A-PCM terminal 1D
  • Engine oil temperature sensor/engine oil pressure sensor terminal D-PCM terminal 1AS
  • Engine oil temperature sensor/engine oil pressure sensor terminal C-PCM terminal 1AB

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 13.
9 INSPECT ENGINE OIL TEMPERATURE SENSOR/ENGINE OIL PRESSURE SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY
  • Verify that the engine oil temperature sensor/engine oil pressure sensor and PCM connectors are disconnected.
  • Switch the ignition ON (engine off).
    NOTE:
    • Another DTC may be stored by the PCM detecting an open circuit.
  • Measure the voltage at the following terminals (wiring harness-side):
    • Engine oil temperature sensor/engine oil pressure sensor terminal A
    • Engine oil temperature sensor/engine oil pressure sensor terminal D
      • Engine oil temperature sensor/engine oil pressure sensor terminal C
  • Is the voltage 0 V?
 Yes Go to the next step.
No Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Engine oil temperature sensor/engine oil pressure sensor terminal A-PCM terminal 1D
  • Engine oil temperature sensor/engine oil pressure sensor terminal D-PCM terminal 1AS
  • Engine oil temperature sensor/engine oil pressure sensor terminal C-PCM terminal 1AB

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 13.
10 INSPECT ENGINE OIL TEMPERATURE SENSOR/ENGINE OIL PRESSURE SENSOR CIRCUITS FOR SHORT TO EACH OTHER
  • Verify that the engine oil temperature sensor/engine oil pressure sensor and PCM connectors are disconnected.
  • Inspect for continuity between engine oil temperature sensor/engine oil pressure sensor terminals A, C and D (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:
  • Engine oil temperature sensor/engine oil pressure sensor terminal A-PCM terminal 1D
  • Engine oil temperature sensor/engine oil pressure sensor terminal D-PCM terminal 1AS
  • Engine oil temperature sensor/engine oil pressure sensor terminal C-PCM terminal 1AB

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 13.
No Go to the next step.
11 INSPECT ENGINE OIL PRESSURE SENSOR
 Yes Replace the engine oil pressure sensor, then go to the Step 13.
(See ENGINE OIL TEMPERATURE SENSOR/ENGINE OIL PRESSURE SENSOR REMOVAL/INSTALLATION [VIN M] ).
No Go to the next step.
12 INSPECT ENGINE OIL SOLENOID VALVE
 Yes Replace the engine oil solenoid valve, then go to the next step.
(See ENGINE OIL SOLENOID VALVE REMOVAL/INSTALLATION [VIN M] ).
No Replace the oil pump, then go to the next step.
(See OIL PUMP REMOVAL/INSTALLATION [VIN M] ).
13 VERIFY DTC TROUBLESHOOTING COMPLETED
 Yes Repeat the inspection from Step 1.
No Go to the next step.
14 VERIFY AFTER REPAIR PROCEDURE
 Yes Go to the applicable DTC inspection.
(See DTC TABLE ).
No DTC troubleshooting completed.
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