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Home >> Mazda >> 2022 >> CX-5 Turbo Signature >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (On-Board Diagnostic - Engine Control System (VIN M) (3 Of 7)) >> DTC P0453-00: Fuel Tank Pressure Sensor High Input >> Diagnostic Procedure

Diagnostic Procedure

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DTC P0453-00: (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 DETERMINE IF FUEL TANK PRESSURE SENSOR OR WIRING HARNESS MALFUNCTION
  • Access the FTP PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST ).
  • Verify the FTP PID value.
  • Is the FTP PID value 5V or B+?
 Yes Go to Step 7.
No Go to the next step.
4 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 12.
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 12.
No Go to the next step.
6 INSPECT FUEL TANK PRESSURE SENSOR
 Yes Replace the charcoal canister, then go to Step 12.
(See CHARCOAL CANISTER REMOVAL/INSTALLATION [VIN M] ).
No Go to Step 12.
7 DETERMINE IF FUELTANK PRESSURE SENSOR SIGNAL CIRCUIT OR FUEL TANK PRESSURE SENSOR GROUND CIRCUIT MALFUNCTION
  • Switch the ignition off.
  • Disconnect the fuel tank pressure sensor connector.
  • Access the FTP PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST ).
  • Verify the FTP PID value.
  • Is the FTP PID value 5 V or B+?
 Yes Go to the next step.
No Go to Step 10.
8 INSPECT FUEL TANK PRESSURE SENSOR SIGNAL CIRCUIT FOR TO POWER SUPPLY
  • Verify that the fuel tank pressure sensor connector is disconnected.
  • Switch the ignition off.
  • Disconnect the PCM connector.
  • Switch the ignition ON (engine off).
    NOTE:
    • Another DTC may be stored by the PCM detecting an open circuit.
  • Measure the voltage at the fuel tank pressure sensor terminal C (wiring harness-side).
  • 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 fuel tank pressure sensor terminal C and PCM terminal 2AJ.
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 12.
9 INSPECT FUEL TANK PRESSURE SENSOR POWER SUPPLY CIRCUIT AND SIGNAL 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 terminal A 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:
  • Fuel tank pressure sensor terminal A-PCM terminal 2AU
  • Fuel tank pressure sensor terminal C-PCM terminal 2AJ

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 12.
No Replace the PCM, then go to Step 12.
(See PCM REMOVAL/INSTALLATION [VIN M] ).
10 INSPECT FUEL TANK PRESSURE SENSOR POWER SUPPLY CIRCUIT FOR SHORT TO POWER SUPPLY
  • Verify that the fuel tank pressure sensor connector is 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 fuel tank pressure sensor terminal A (wiring harness-side).
  • Is the voltage 5 V?
 Yes Go to the next step.
No Refer to the wiring diagram and verify whether or not there is a common connector between fuel tank pressure sensor terminal A and PCM terminal 2AU.
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 12.
11 INSPECT FUELTANK PRESSURE SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
  • Verify that the fuel tank pressure sensor connector is disconnected.
  • Switch the ignition off.
  • Disconnect the PCM connector.
  • Inspect for continuity between fuel tank pressure sensor terminal B (wiring harness-side) and PCM terminal 2AI (wiring harness-side).
  • Is there continuity?
 Yes Replace the charcoal canister, then go to the next step.
(See CHARCOAL CANISTER REMOVAL/INSTALLATION [VIN M] ).
No Refer to the wiring diagram and verify whether or not there is a common connector between fuel tank pressure sensor terminal B and PCM terminal 2AI.
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.
12 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 PENDING CODE for this DTC present?
 Yes Repeat the inspection from Step 1.

Go to the next step.
No Go to the next step.
13 VERIFY AFTER REPAIR PROCEDURE
 Yes Go to the applicable DTC inspection.
(See DTC TABLE ).
No DTC troubleshooting completed.
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