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Home >> Mazda >> 2007 >> B4000 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0453: Fuel Tank Pressure Sensor Malfunction >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Mazda B4000, 2003 Mazda B3000, and 2003 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 P0453: Verify FTP Voltage -  With KOEO, access and record FTP V PID. If FTP V PID voltage reading is more than 4.5 volts, go to next step. If FTP V PID voltage reading is 4.5 volts or less, fault that produced DTC P0453 is intermittent. See INTERMITTENT  testing under SYSTEM TESTS.
  3. Check FTP Sensor For Short To Power -  Turn ignition off. Disconnect FTP sensor 3-pin harness connector. With KOEO, measure voltage of FTP circuit (Red/Pink wire) between FTP sensor 3-pin harness connector and battery ground. See Figure . If voltage reading is more than 10.5 volts, a short to VPWR is indicated. Go to next step. If voltage reading is 10.5 volts or less, go to step  5 .
  4. Check FTP Circuit For Short To VPWR -  Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure . With KOEO, measure voltage between breakout box terminals No. 62 (FTP circuit) and 103 (PWR GND circuit). If voltage reading is more than 10.5 volts, repair short circuit between FTP circuit (Red/Pink wire) and VPWR circuit. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  11 . If voltage reading is 10.5 volts or less, FTP circuit is shorted to VPWR circuit in PCM. Replace faulty PCM. After repair, go to step  11 .
    5. NOTE: During next step, if a scan tool communication problem is present, remove jumper wire and go to step  10 .
  5. Induce Opposite FTP Signal -  Turn ignition off. Connect fused jumper wire between SIG RTN circuit (Gray/Red wire) and FTP circuit (Red/Pink wire) at FTP sensor 3-pin harness connector. With KOEO, access and record FTP V PID. If FTP V PID voltage reading is less than .10 volt, go to next step. If FTP V PID voltage reading is not less than .10 volt, unable to induce opposite signal. Go to step  8 .
  6. Verify VREF Is In Range -  Measure voltage between VREF circuit (Brown/White wire) and SIG RTN circuit (Gray/Red wire) at FTP sensor 3-pin harness connector. See Figure . If VREF voltage reading is 4-6 volts, go to next step. If VREF voltage reading is not 4-6 volts, see VEHICLE REFERENCE VOLTAGE  testing under SYSTEM TESTS.
  7. Check FTP For Short To VREF In Sensor Or Harness -  Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure . Measure resistance between breakout box terminals No. 62 (FTP circuit) and No. 90 (VREF circuit). If resistance reading is more than 10,000 ohms, SIG RTN circuit is shorted to VREF circuit in FTP sensor. Replace faulty FTP sensor. After repair, go to step  11 . If resistance reading is 10,000 ohms or less, repair short in harness between FTP circuit (Red/Pink wire) and VREF circuit (Brown/White wire). See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  11 .
  8. Check Resistance Of FTP Circuit -  Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure . Measure resistance of FTP circuit between breakout box terminal No. 62 and FTP sensor 3-pin harness connector (Red/Pink wire). If resistance reading is less than 5 ohms, go to next step. If resistance reading is 5 ohms or more, repair open in FTP circuit (Red/Pink wire) between PCM 104-pin harness connector terminal No. 62 and FTP sensor 3-pin harness connector. After repair, go to step  11 .
  9. Check Resistance Of SIG RTN Circuit -  Measure resistance of SIG RTN circuit between breakout box terminal No. 91 and FTP sensor harness connector (Gray/Red wire). See Figure . If resistance reading is less than 5 ohms, go to next step. If resistance reading is 5 ohms or more, repair open in SIG RTN circuit (Gray/Red wire). See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  11 .
  10. Check FTP For Short To VREF In PCM Or Harness -  Measure resistance between breakout box terminals No. 62 (FTP circuit) and No. 90 (VREF circuit). If resistance reading is more than 10,000 ohms, FTP circuit (Red/Pink wire) is open, SIG RTN circuit (Gray/Red wire) is open or FTP circuit is shorted to VREF circuit in PCM. Replace faulty PCM. After repair, go to next step. If resistance reading is 10,000 ohms or less, repair short in harness between FTP circuit (Red/Pink wire) and VREF circuit (Brown/White wire). Go to next step.
  11. Verify Trouble Shooting Of DTCs Completed -  Reconnect all electrical connectors. Clear DTCs from PCM memory using scan tool. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no DTC is present, trouble shooting is complete.
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