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Home >> Mazda >> 2021 >> CX-5 Sport, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (On-Board Diagnostic - Engine Control (VIN Y) (2 Of 3)) >> DTC P0452-00: Fuel Tank Pressure Sensor Low Input >> Diagnostic Procedure

Diagnostic Procedure

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DTC P0452:00 (PCM, VIN Y) DIAGNOSTIC PROCEDURE

STEP INSPECTION RESULTS ACTION
1 RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION
  • 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 FUEL TANK PRESSURE SENSOR CONNECTOR CONDITION
  • Switch the ignition off.
  • Disconnect the fuel tank 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 9.
No Go to the next step.
4 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.
5 INSPECT FUEL TANK PRESSURE SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND
  • Verify that the fuel tank pressure sensor and PCM connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:
    • Fuel tank pressure sensor terminal A
      • Fuel tank 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:
  • Fuel tank pressure sensor terminal A-PCM terminal 2Y
  • Fuel tank pressure sensor terminal C-PCM terminal 2M

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 9.
No Go to the next step.
6 INSPECT FUEL TANK PRESSURE SENSOR SIGNAL CIRCUIT AND GROUND CIRCUIT FOR SHORT TO EACH OTHER
  • Verify that the fuel tank pressure sensor and PCM connectors are disconnected.
  • Inspect for continuity between fuel tank pressure sensor terminals C and B (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:
  • Fuel tank pressure sensor terminal C-PCM terminal 2M
  • Fuel tank pressure sensor terminal B-PCM terminal 2V

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 FUEL TANK PRESSURE SENSOR CIRCUIT FOR OPEN CIRCUIT
  • Verify that the fuel tank pressure sensor and PCM connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Fuel tank pressure sensor terminal A-PCM terminal 2Y
      • Fuel tank pressure sensor terminal C-PCM terminal 2M
  • 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:
  • Fuel tank pressure sensor terminal A-PCM terminal 2Y
  • Fuel tank pressure sensor terminal C-PCM terminal 2M

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 FUEL TANK PRESSURE SENSOR
 Yes Replace the charcoal canister, then go to the next step.
(See CHARCOAL CANISTER REMOVAL/INSTALLATION [VIN Y] .)
No Go to the next step.
9 VERIFY DTC TROUBLESHOOTING COMPLETED
  • Always reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC .)
  • Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST .)
  • Is the same Pending DTC present?
 Yes Repeat the inspection from Step 1.
  • If the malfunction recurs, replace the PCM.

(See PCM REMOVAL/INSTALLATION [VIN Y] .) 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 .)
No DTC troubleshooting completed.
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