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| Operating Instructions |
SMT500 Leak Detector
SP01501467 | REV A | 4.2021
Bosch Automotive Service Solutions Inc
5. Input vapor into the system through adapter.
6. Remove the fuel cap until dense vapor is
exiting the filler neck.
7. Replace the fuel cap and continue pumping
vapor into the system.
8.
As the system fills with vapor and the system
pressure equalizes, observe the flow meter
and pressure gauge.
9. When pressure gauge reaches its maximum
pressure, the flow meter will indicate leak size.
Note: Flow meter will drop to zero if there are no
leaks.
10. Use the daylight spectrum LED cordless light
to inspect under the hood and trace the
route of the EVAP system on the underside
of the vehicle for leaks.
11. Repair the system as needed.
After all repairs have been made, retest the
system using the decay or leak down testing
method with air only.
12. Input air into EVAP system until fully
pressurized.
13.
Lock out system by turning the flow control
knob to the fully closed position.
If leaks are repaired properly, system will hold
pressure.
If pressure decays or leaks exist, repeat above
procedures until all repairs are complete.
Exhaust Leaks
This test is most effective when exhaust system
is cold; thermal expansion may cause small leaks
to seal.
1. Insert Easy INTAKE™ into the end of the
tailpipe. If the vehicle has dual exhaust with
cross over system, plug the other tailpipe to
seal the system.
2. Put vapor output hose into Easy INTAKE™ to
introduce vapor into the system.
Note: A hot catalytic converter may consume
some of the smoke.
All testing is performed with the engine off.
Under-Dashboard Leaks
Many vehicles have a common vacuum line,
leading from the engine compartment through
the firewall, under the dashboard.
This line supplies vacuum to climate control
functions and other vacuum-operated systems.
1. Disconnect the vacuum line, under the hood,
at its source.
2. Input vapor into the vacuum line.
3.
Observe the flow meter and pressure gauge
while changing the climate controls from
heat to vent, to defrost, etc.
Note: Change in the flow meter or pressure gauge
reading will indicate which system is leaking.
4. Set the climate control to the leaking system.
5. Use the daylight spectrum LED cordless light
to locate under-dash leaks.
Central locking system leak inspection is
performed in the same manner.
Activate control solenoids while introducing
vapor into the system.
