Signal Too Low

Signal too low

Checking the component
- Slacken off the EVAP canister purge valve
- Connect a vacuum pump to the EVAP canister purge valve terminal (B). Pump a vacuum. Check that there is no leakage through the EVAP canister purge valve by listening to and checking via the pump gauge that the pressure is stable
- Connect the EVAP canister purge valve connector
- Ignition on
- Activate the evaporative emission system (EVAP) valve. When the EVAP canister purge valve is activated, the valve opens and clicks. Check on the pump gauge that the vacuum drops (the pressure evens out) when the EVAP valve opens.
If the function is OK, there must be no leakage when the EVAP canister purge valve is closed (stable pressure on the pump gauge) and the vacuum must drop when the EVAP canister purge valve opens (the pressure evens out).
The EVAP canister purge valve is defective if the function is faulty.
If the function of the EVAP canister purge valve is OK, check:
- The hose and hose terminals between the EVAP canister purge valve and the intake manifold. Check for leakage and blockages
- The hose and hose terminals between the EVAP canister and the EVAP canister purge valve. Check for leakage and blockages.
Remedy as necessary.

Other information:
- For the location of components on 5 cylinder engines, see Location of components Locations
- For the location of components on 6 cylinder normally aspirated engines, see Location of components Locations
- For the location of components on 6 cylinder turbocharged engines, see Location of components Locations
- To access or replace the hoses and/or EVAP canister, see Carbon filter container, replacing Service and Repair.









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