DTC P0450: Evaporative (EVAP) Control System Pressure Sensor Malfunction
- If scan tool is available, turn ignition off and connect scan tool to Data Link Connector (DLC). Select FUEL TANK PRESS parameter. If scan tool is not available, use DVOM to check voltage (backprobe) at PCM harness connector terminal E61-27. See PIN VOLTAGE/CIRCUIT RESISTANCE CHARTS article for PCM connector and terminal identification. For either method of testing, remove fuel filler cap and turn ignition on. Scan tool display should read around 0 kPa (0 mm Hg), and DVOM should read between 2-3 volts. If readings are as specified, go to step 3 . If readings are not as specified, go to next step.
- Check fuel tank pressure sensor. See FUEL TANK PRESSURE SENSOR in SYSTEM & COMPONENT TESTING article. If fuel tank pressure sensor operation is not as specified, replace sensor and retest system. If operation is as specified, check for open or short circuits in Brown/Red, Gray/Red or Gray/Yellow wires between fuel tank pressure sensor and PCM. Repair as necessary. If wiring and connections are okay, replace PCM and retest system.
- Check fuel tank pressure sensor. See FUEL TANK PRESSURE SENSOR in SYSTEM & COMPONENT TESTING article. If fuel tank pressure sensor operation is not as specified, replace sensor and retest system. If operation is as specified, go to next step.
- Check fuel tank pressure control valve operation. See TANK PRESSURE CONTROL VALVE in SYSTEM & COMPONENT TESTING article. If valve operation is as specified, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. If no intermittent problems were found, replace PCM. If valve operation is not as specified, replace tank pressure control valve and retest system.