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DTC P0451: EVAP System Pressure Sensor Range/Performance: Procedure

  1. Turn ignition off. Remove rear seat. Disconnect ECM 88-pin connector and fuel tank unit 4-pin connector C305. 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.
  2. 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 5.6-5.8 volts. 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 each voltage is as specified, go to next step. If each voltage is more than specified, locate and repair short to power in Light Green/Yellow wire between ECM and fuel tank unit. If voltage at ECM connector is within specifications and voltage at fuel tank unit is less than specifications, locate and repair open in Light Green/Yellow wire between ECM and fuel tank unit.
  3. Turn ignition off. Remove FTPS from fuel tank unit. Connect FTPS connector. 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 as specified, go to next step. If voltage is not as specified, replace FTPS.
  4. Turn ignition off. Disconnect hose between EVAP canister and CCV at EVAP canister end. Blow through hose and check if air escapes from port on back of CCV. Air should escape. Turn ignition on. Backprobe and connect jumper wire between ECM connector terminal No. 18 (color not available) and ground. Blow through hose and check if air escapes from port on back of CCV. Air should not escape. Repeat test 4-5 times to ensure reliability of results. If CCV reliably operates as specified, check connectors between ECM and FTPS for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If CCV does not operate as specified, or operation is not reliable, check hose between EVAP canister and CCV for restriction. If problem exists, repair hose as necessary. If problem does not exist, replace CCV.
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