Special Tools: Overview

COMBUSTIBLE GAS DETECTOR 

The combustible gas detector is used to detect petrol vapor leaks. Before testing, perform the proving and calibrating routines.

Proving Routine 

Perform the following steps to test the combustible gas detector:

1. Rotate the sensitivity control fully counter-clockwise
2. Set the combustible gas detector power switch to 'ON'
3. Check the battery warning indicator - The batteries must be recharged if the warning indicator is not illuminated
4. Allow the combustible gas detector to warm up (approximately 30 seconds)
5. Slowly rotate the sensitivity control fully clockwise - Check that the ticking rate increases and ultimately becomes a siren
6. When testing is complete, set the combustible gas detector power switch to 'OFF'

   Calibration Routine 

   Perform the following step to calibrate the combustible gas detector:

7. Slowly rotate the sensitivity control until a rapid ticking is audible - the detector is now set to 'high sensitivity' mode and this is suitable for detecting small leaks. Alternatively, if the siren sounds repeatedly during testing, rotate the sensitivity control until a slow ticking is audible - the detector is now set to 'low sensitivity' mode and this is suitable for detecting the source of large leaks

Testing 

The fuel tank must be pressurized during leak testing. To achieve this, use the Jaguar Land Rover Approved Diagnostic Equipment to perform routine - Evaporative System Diagnostic Check. Test the fuel system components for leaks in the following order:

1. Fuel filler cap
2. Purge valve
3. Diagnostic module tank leakage module
4. Fuel tank
5. Filler neck / vapor hose

PURGE VALVE HOSE BUNGS 

A leaking (not closing fully) purge valve is identified in the Pinpoint Tests by performing the test routine with a bung installed in the purge hose.

Bung Sizes