Fuel Pressure Control System
- On Paseo with A/T, ensure coolant temperature switch operates correctly. See ENGINE SENSORS & SWITCHES. On all other models, ensure coolant temperature sensor operates correctly. See ENGINE SENSORS & SWITCHES.NOTE: On Paseo with A/T, Electronic Control Unit (ECU) uses signal from coolant temperature switch to control ground circuit for fuel pressure control system Vacuum Switching Valve (VSV). On other models, ECU uses signal from coolant temperature sensor to control ground circuit for fuel pressure control VSV.
- On all models, VSV is supplied voltage through EFI main relay. The ECU will activate VSV for approximately 90 seconds when restarting engine at normal operating temperature. Locate and remove fuel pressure control VSV. See FUEL PRESSURE CONTROL VSV LOCATION table.NOTE: Fuel pressure control VSV may also be identified by appropriate illustration in THEORY/OPERATION article in the ENGINE PERFORMANCE Section or wire color. See appropriate wiring diagram in WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.FUEL PRESSURE CONTROL VSV LOCATION
Application Location Paseo Near Front Of Valve Cover, On Firewall Side - On all models use ohmmeter to check continuity between VSV electrical terminals. Ensure resistance is within specification. See FUEL PRESSURE CONTROL VSV RESISTANCE SPECIFICATIONS table.
- Check that no continuity exists between each electrical terminal and VSV body. Replace VSV if resistance is not within specification or continuity exists between electrical connector and VSV body.
- On all models, test VSV by applying air pressure to designated area and checking air passage, and then applying battery voltage and retesting. See Fig 1. Replace VSV if defective.
FUEL PRESSURE CONTROL VSV RESISTANCE SPECIFICATIONS
| Application | Ohms |
|---|---|
| Paseo | 37-44 |