DTC P0450: EVAP Control System Pressure Sensor (EVAP-CSPS): Procedure
- Check EVAP-CSPS hose for blockage or leak. See Fig 1. Repair as necessary and retest system. If hose is okay, loosen and retighten engine ground bolts. See Figure. Disconnect EVAP-CSPS harness connector. If water exists in connector, repair or replace connector and retest system. If connector is okay, go to next step.
- Turn ignition on. Measure voltage between ground and EVAP-CSPS harness connector Pink/Blue wire. If voltage is not about 5 volts, repair open in Pink/Blue wire. If voltage is about 5 volts, turn ignition off. Check continuity between ground and EVAP-CSPS harness connector Black wire. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire.
- Disconnect PCM harness connector. See Figure. Check continuity of White wire between EVAP control system pressure sensor harness connector 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-CPVCV. See DTC P0443: EVAP CANISTER PURGE VOLUME CONTROL VALVE (EVAP-CPVCV) . Replace as necessary and retest system. If EVAP-CPVCV is okay, check EVAP-CVCV. See DTC P0446: EVAP CANISTER VENT CONTROL VALVE (EVAP-CVCV) . Replace as necessary and retest system. If EVAP-CVCV is okay, go to next step.
- Remove EVAP-CSPS with harness connector connected. Disconnect hose from EVAP-CSPS. Using a hand vacuum pump, apply vacuum to EVAP-CSPS. Measure voltage between ground and PCM harness connector terminal No. 67 by backprobing with vacuum as specified. See Figure. See EVAP CONTROL SYSTEM PRESSURE SENSOR VOLTAGE table. Replace EVAP-CSPS, if voltage is not as specified. If voltage is as specified, go to next step.
- Check for blockage in water separator and EVAP-CVCV hose. Clean or repair as necessary and retest system. If no blockage is found, check EVAP canister. See DTC P0440 OR P1440: EVAP CONTROL SYSTEM . Replace canister as necessary. If canister is okay, go to next step.
- Check shield circuit for continuity to ground. Shields are connected to ground through connector F-19 (Blue 12-pin joint connector located near PCM). See appropriate diagram in WIRING DIAGRAMS article. If continuity does not exist, repair open circuit. If continuity exists, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
CAUTION:
DO NOT apply more than 5.91 in. Hg (20 kPa) of vacuum to EVAP-CSPS.
EVAP CONTROL SYSTEM PRESSURE SENSOR VOLTAGE
| Pressure | Volts |
|---|---|
| Atmospheric Pressure | 3.0-3.6 |
| 2.76 in. Hg (9.3 kPa) | .4-.6 |