EVAP Vacuum Control Valve
- Warm engine to normal operating temperature. Disconnect vacuum hose from union pipe at EVAP Vacuum Control Valve (VCV). See Fig 1. With engine idling, ensure no suction exists on union pipe at EVAP Vacuum Control Valve (VCV).
- Gradually increase engine to 3000 RPM. Ensure suction now exists on union pipe. If suction does not exist, remove EVAP VCV. Using vacuum pump, apply 2.8 in. Hg of vacuum to port "S" on EVAP VCV. See Fig 1.
- Apply air pressure to port "Y". Ensure air flows from port "Z". Remove vacuum pump. Apply air pressure to port "Y". Ensure air does not flow from port "Z". Replace EVAP VCV if defective and recheck operation. If EVAP VCV is okay, check EVAP Vacuum Switching Valve (VSV).
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