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DTC P0453: EVAP System Pressure Sensor Circuit High Input: Procedure

  1. Turn ignition off. Remove rear seat. Disconnect fuel tank unit 4-pin connector C305. Turn ignition on. Measure voltage between ground and fuel tank unit connector C305 terminal No. 4 (Light Green/Yellow wire). See Figure. Voltage should be 5.6-5.8 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair open or short to power in Light Green/Yellow wire between FTPS and ECM.
  2. Measure voltage between ground and fuel tank unit connector C305 terminal No. 1 (Blue/White wire). Voltage should be about 5 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair short to power in Blue/White wire between fuel tank unit and ECM.
  3. Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance of Black/Green wire between fuel tank unit connector C305 terminal No. 2 and ECM connector terminal No. 71. See Figure and Figure . If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Black/Green wire between fuel tank unit and ECM.
  4. Remove FTPS from fuel tank. Connect fuel tank unit connector C305 to FTPS. Connect ECM connector. Turn ignition on. Backprobe and measure voltage between ECM connector terminal No. 76 (Light Green/Yellow wire) and ground. Voltage should be 2.18-2.82 volts. If voltage is as specified, check connectors for loose, damaged or corroded terminals. If problem exists, repair as necessary. If voltage is not as specified, replace FTPS.
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