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DTC P0450 - Evaporative (EVAP) Emission Control System Pressure Sensor Malfunction

NOTE: If other DTCs are set with DTC P0450, Light Green circuit (sensor reference voltage) or Light Green/Black circuit (sensor ground) may be open.
  1. Check fuel tank pressure sensor operation. See appropriate SYSTEM/COMPONENT TESTS article. If operation is as specified, go to next step. If operation is not as specified, repair as necessary. Retest system.
  2. Remove fuel filler cap. Turn ignition on. Using a voltmeter, measure voltage (backprobe) between ground and PCM harness connector "C", terminal No. 21. If reading is about 2.0-2.5 volts, go to next step. If reading is not as specified, check Light Green wire, Light Green/Yellow wire and Light Green/Black wire for an open or short. Repair as necessary. If wires are okay, replace PCM. Retest system.
  3. Check fuel tank pressure control valve operation. See appropriate SYSTEM/COMPONENT TESTS article. If operation is as specified, check for an intermittent problem. See TESTS W/O CODES article. If operation is not as specified, repair as necessary. Retest system.
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