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DTC P0452: EVAP System Pressure Sensor Circuit Low 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. 1 (Blue/White wire). See Figure. Voltage should be about 5 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair short to ground or open in Blue/White wire between fuel tank unit and ECM.
  2. Measure voltage between ground and fuel tank unit connector C305 terminal No. 4 (Light Green/Yellow wire). Voltage should be 5.6-5.8 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair short to ground in Light Green/Yellow wire between fuel tank unit and ECM.
  3. Turn ignition off. Remove FTPS from fuel tank. Connect fuel tank unit connector C305 to FTPS. Turn ignition on. Backprobe and measure voltage between ECM connector terminal no. 76 (Light Green/Yellow wire) and ground. See Figure. Voltage should be 2.18-2.82 volts. If voltage is not as specified, replace FTPS. If voltage is as specified, check connectors for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.
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