DTC P0450: EVAP Control System Pressure Sensor: Procedure
- Turn ignition off. Loosen and retighten engine 2 ground wires located near fuel injectors. See Figure or Figure
. Disconnect EVAP control system pressure sensor harness connector. See Fig 1. Turn ignition on. Using DVOM, measure voltage between EVAP control system pressure sensor harness connector terminal No. 3 (Pink/Blue wire) and ground. If voltage is approximately 5 volts, go to next step. If voltage is not approximately 5 volts, check for open or short in Pink/Blue wire.
- Turn ignition off. Using DVOM, check continuity between EVAP control system pressure sensor harness connector terminal No. 1 (Black wire) and ground. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire.
- Disconnect PCM harness connector. See Figure. Using DVOM, measure continuity between EVAP control system pressure sensor harness connector terminal No. 2 (White wire) and PCM harness connector terminal No. 67. See Figure. If continuity exists, go to next step. If continuity does not exist, repair fault in White wire.
- Check EVAP canister purge volume control valve. See DTC P0443 OR P1444: EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE. Replace as necessary and retest system. If components are okay, go to next step.
- Check EVAP canister vent control valve. See DTC P0446, P1446 OR P1448: EVAP CANISTER VENT CONTROL VALVE . Replace as necessary and retest system. If valve is okay, go to next step.
- Reconnect PCM and EVAP control system pressure sensor harness connectors. Remove sensor from bracket. Connect vacuum pump to pressure sensor vacuum port. Using DVOM, measure voltage between PCM harness connector terminal No. 67 and ground. Voltage should be approximately 3.3 volts. Using vacuum pump, apply 2.7 in. Hg to sensor. Voltage should be approximately 0.5 volt. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP control system pressure sensor.
- Check EVAP canister. See DTC P0440 OR P1440: EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM . Replace canister as necessary. If canister is okay, disconnect system harness connectors and inspect for damage or corrosion. Repair as necessary and retest system.
Courtesy of NISSAN MOTOR CO., U.S.A.