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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 P0453: Verify FTP Voltage -  Turn ignition on, engine off. Access FTP V PID with scan tool. If FTP V PID voltage reading is more than 4.5 volts, go to next step. If FTP V PID voltage reading is not more than 4.5 volts, problem is intermittent. Refer to INTERMITTENT  testing under SYSTEM TESTS.
  3. Check FTP At FTP Sensor For Short To Power -  Turn ignition off. Disconnect FTP sensor 3-pin harness connector. Turn ignition on, engine off. Measure voltage between ground and FTP sensor 3-pin harness connector (Red/Pink wire). See Figure. If voltage reading is more than 10.5 volts, go to next step. If voltage reading is not as specified, 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. Turn ignition on, engine off. Measure voltage between breakout box terminal No. 62 (FTP) and terminal No. 103 (PWR GND). If voltage reading is more than 10.5 volts, repair short to VPWR circuit in Red/Pink wire between FTP sensor 3-pin harness connector and PCM 104-pin harness connector terminal No. 62. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  11. If voltage reading is not more than 10.5 volts, FTP circuit is shorted to VPWR circuit inside PCM. Replace PCM. After repair, go to step  11.
    5. NOTE: If scan tool communication concern exists during following procedure, remove fused jumper wire immediately and go to step  10.
  5. Induce Opposite FTP Signal -  Turn ignition off. Connect fused jumper wire between FTP sensor SIG RTN circuit (Orange wire) and FTP circuit (Red/Pink wire) at FTP sensor 3-pin harness connector. Turn ignition on, engine off. Access FTP V PID with scan tool. If FTP V PID voltage reading is less than 0.10 volt, remove fused jumper wire and go to next step. If FTP V PID voltage reading is not as specified, go to step  8.
  6. Verify That VREF Is In Range -  Measure voltage between VREF (Brown/White wire) and SIG RTN (Orange wire) 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.
  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) and No. 90 (VREF). If resistance reading is more than 10,000 ohms, replace FTP sensor. After repair, go to step  11. If resistance reading is not as specified, repair short between FTP SIG circuit (Orange 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 (Red/Pink wire) between breakout box terminal No. 62 and FTP sensor 3-pin harness connector. See Figure. If resistance reading is less than 5 ohms, go to next step. If resistance reading is not as specified, repair open circuit in Red/Pink wire between PCM 104-pin harness connector terminal No. 62 and FTP sensor 3-pin harness connector. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  11.
  9. Check Resistance Of SIG RTN Circuit -  Measure resistance of SIG RTN circuit (Orange wire) between breakout box terminal No. 91 and FTP sensor 3-pin harness connector. If resistance reading is less than 5 ohms, go to next step. If resistance reading is not as specified, repair open circuit in Orange wire between PCM 104-pin harness connector terminal No. 91 and FTP sensor 3-pin harness connector.
  10. Check FTP For Short To VREF In PCM Or Harness -  Measure resistance between breakout box terminals No. 62 (FTP) and No. 90 (VREF). If resistance reading is more than 10,000 ohms, replace PCM. After repair, go to next step. If resistance reading is not as specified, repair short between FTP circuit (Red/Pink wire) and VREF circuit (Brown/White wire). After repair, go to next step.
  11. Verify Trouble Shooting Of DTCs Completed -  Reconnect all disconnected connectors. Clear DTCs from PCM memory using scan tool. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is not 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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