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/Black wire. If voltage is not about 5 volts, repair open or short in Pink/Black 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 ECM harness connector. See Figure. Check continuity between EVAP control system pressure sensor harness connector Green/Black wire and ECM harness connector terminal No. 62 (Green/Black wire). See Figure. If continuity exists, go to next step. If continuity does not exist, repair open circuit.
- 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 ECM harness connector terminal No. 62 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 for water. See DTC P0440 OR P1440: EVAP CONTROL SYSTEM . Replace canister as necessary. If canister is okay, go to next step.
- Disconnect connector B-43 (Gray, 8-pin connector located near EVAP canister). Check continuity between ground and connector B-43 terminal No. 5. See Fig 2. If continuity exists, go to next step. If continuity does not exist, repair open ground circuit.
- No problem is currently indicated. 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 of vacuum to EVAP-CSPS.
EVAP CONTROL SYSTEM PRESSURE SENSOR VOLTAGE
| Pressure | Volts |
|---|---|
| Atmospheric Pressure | 3.0-3.6 |
| 2.76 in. Hg | .4-.6 |