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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0452: Fuel Tank Pressure Sensor Malfunction >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed, go to next step.

  2. DTC P0452: Check For Fuel Saturation Of FTP Sensor

    Turn ignition off. Visually check for liquid fuel contamination of FTP sensor electrical connector. Check for a completely submerged FTP sensor in liquid fuel which can affect correct FTP voltage reading. If FTP sensor and its electrical connector show signs of fuel contamination, repair FTP sensor electrical connector as necessary. If FTP sensor is completely submerged in fuel, drain fuel tank and refill. Go to step  7 . If FTP sensor and its electrical connector do not show signs of fuel contamination, go to next step.

  3. Verify FTP SIG Voltage

    With KOEO, access FTP V PID. If FTP V PID voltage is less than 0.22 volts, go to next step. If FTP V PID voltage is 0.22 volts or more, fault that produced DTC P0452 is intermittent. See INTERMITTENT  under SYSTEM TESTS.
    NOTE: If a scan tool communication problem is present, remove jumper wire and go to step  5 .

  4. Induce Opposite FTP Signal

    Turn ignition off. Disconnect FTP sensor harness. Connect a jumper wire between VREF circuit (Brown/White wire) and FTP circuit (Red/Pink wire) at FTP sensor harness connector. See Fig 1 . With KOEO, access FTP V PID. If voltage is 4-6 volts, replace faulty FTP sensor. Go to step  7 . If voltage is not 4-6 volts, remove jumper wire. Go to next step.
    Fig 1: Identifying FTP Sensor Circuits
    G00155546Courtesy of MAZDA MOTORS CORP.

  5. Check VREF at FTP Sensor Vehicle Harness Connector

    Measure voltage between VREF circuit (Brown/White wire) and SIG RTN circuit (Gray/Red wire) at FTP sensor harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, VREF is out of range. See VEHICLE REFERENCE VOLTAGE  under SYSTEM TESTS.

  6. Check FTP Circuit For Shorts To SIG RTN & PWR GND

    Turn ignition off. Disconnect PCM connector. Install breakout box, leaving PCM disconnected. Disconnect scan tool from vehicle. Measure resistance between breakout box terminals No. 62 (FTP circuit) and 91 (SIG RTN circuit). Measure resistance between breakout box terminals No. 62 (FTP circuit) and 103 (PWR GND circuit). If resistance is more than 10,000 ohms, FTP circuit (Red/Pink wire) is shorted to SIG RTN circuit (Gray/Red wire) or PWR GND in PCM. Replace faulty PCM. Go to next step. If resistance is 10,000 ohms or less, repair harness short between FTP circuit and SIG RTN circuit or PWR GND circuit. See WIRING DIAGRAMS article. Go to next step.

  7. Verify Trouble Shooting Of DTCs Completed

    Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any DTC is present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no DTCs are set, trouble shooting is complete.
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