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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 69 (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 2003 Mazda Tribute. 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 3-pin harness connector. Check for a completely submerged FTP sensor in liquid fuel which can affect correct fuel tank pressure voltage reading. If FTP sensor and 3-pin harness connector do not show signs of fuel contamination, go to next step. If FTP sensor and 3-pin harness connector show signs of fuel contamination, repair FTP sensor 3-pin harness connector as necessary. If FTP sensor is completely submerged in fuel, drain fuel tank to proper level. After repair, go to step  7.
  3. Verify FTP SIG Voltage -  Turn ignition on, engine off. Access FTP V PID with scan tool. If FTP V PID voltage reading is less than 0.22 volt, go to next step. If voltage reading is not as specified, fault is intermittent. Refer to INTERMITTENT  testing under SYSTEM TESTS.
    4. NOTE: If a scan tool communication concern exists during next step, remove fused jumper wire immediately and go directly to step  5.
    Fig 1: Identifying FTP Sensor Circuits & 3-Pin Harness Connector Terminals
    G00159000Courtesy of MAZDA MOTORS CORP.
  4. Induce Opposite FTP Signal -  Turn ignition off. Disconnect FTP sensor 3-pin harness connector. Connect a fused jumper wire between VREF (Brown/White wire) and FTP (Red/Pink wire) terminals at FTP sensor 3-pin harness connector. See Fig 1. Turn ignition on, engine off. Access FTP V PID with scan tool. If FTP V PID value is 4-6 volts, replace FTP sensor. After repair, go to step  7. If FTP V PID value is not as specified, remove fused jumper wire and go to next step.

  5. Check VREF At FTP Sensor Harness Connector

    Measure voltage between VREF (Brown/White wire) and SIG RTN (Orange wire) terminals at FTP sensor 3-pin harness connector. If VREF voltage reading is 4-6 volts, go to next step. If VREF voltage reading is not as specified, refer to VEHICLE REFERENCE VOLTAGE  testing under SYSTEM TESTS.

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

    Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Disconnect scan tool from DLC. Measure resistance between breakout box terminals No. 62 (FTP) and No. 91 (SIG RTN). Measure the resistance between breakout box terminals No. 62 (FTP) and No. 103 (PWR GND). If each resistance reading is more than 10,000 ohms, replace PCM. After repair, go to next step. If each resistance reading is not more than 10,000 ohms, repair short in harness between FTP circuit (Red/Pink wire) and SIG RTN circuit (Orange wire) or PWR GND circuit (Black wire). See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to next step.
  7. Verify Trouble Shooting Of DTCs Completed -  Reconnect all disconnected connectors. Perform PCM Quick Test. 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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