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DTC P0452: Fuel Tank Pressure Sensor Input Low: Testing

NOTE: Ensure freeze frame data has been recorded. Check for service bulletins and on-line information.
  1. Connect scan tool. Start engine. Check FTP V PID. If PID is less than .2 volt, go to next step. If PID is .2 volt or more, problem is not present. Check for intermittent problem. See TROUBLE SHOOTING - NO CODES article.
  2. Disconnect FTP sensor connector. Using scan tool, check FTP V PID. If PID is 4.8 volts or more, go to next step. If PID is less than 4.8 volts, go to step  5 .
    NOTE: If DTC P0107 and P0122 are present, check reference voltage. See REFERENCE VOLTAGE test in SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article.
  3. Turn ignition on. Check voltage between sensor harness connector terminal "C" (Pink/Blue wire) and ground. If voltage is not 4.5-5.5 volts, go to next step. If voltage is 4.5-5.5 volts, check connector terminal. If problem is found, repair as necessary. If terminal is okay, replace fuel tank pressure sensor and go to step  7 .
  4. Disconnect 3-pin connector, located about 3 inches from sensor, near charcoal canister. Check voltage between 3-pin male harness connector terminal "C" (Pink/Blue wire) and ground. If voltage is 4.5-5.5 volts, repair open Pink/Blue wire between 3-pin connector terminal "C" and TP sensor terminal "C". After repair, go to step  7 . If voltage is not 4.5-5.5 volts, repair open Pink/Blue wire between PCM terminal 90 and connector terminal "C". After repair, go to step  7 .
  5. Turn ignition off. Disconnect 3-pin connector, located about 3 inches from sensor, near charcoal canister. Check continuity between 3-pin female harness connector terminal "A" (Red wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground. After repair, go to step  7 .
  6. Disconnect PCM connector. PCM is mounted to passenger floor, behind glove box. Check continuity between 3-pin male harness connector terminal "A" (Red wire) and ground. If continuity is present, repair short to ground. If continuity is not present, check FTP circuits for short circuit. Repair as necessary. After repair, go to next step.
  7. Reconnect all components. Turn ignition on. Using scan tool, clear DTC. Start engine. Ensure FTP V PID is .2-4.8 volts when ECT V PID is less than 176°F. Recheck DTCs. If DTC P0452 is present, replace PCM and go to next step. If DTC P0452 is not present, go to next step.
  8. Perform after repair procedure. See AFTER REPAIR PROCEDURE  . If no DTC is present, testing is complete. If any DTC is present, go to appropriate test for diagnosis and repair.
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