Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Drive Cycle for 40 thou leak test
2002 Jaguar XK8 2D CoupeSECTION Drive Cycle for 40 thou leak test
- Make sure the 'conditions for adaptation' detailed at the start of this section are met.
- Avoiding high engine loads, drive the vehicle steadily between 48 and 89 kph (30 and 55 mph) for 15 to 20 minutes after starting the engine. (Depending on the amount of fuel vapor generated, the test may take longer than this).
- Where possible, avoid body roll to minimise fuel movement.
- If the scan tool being used is able to read TIDs, check TID 08 in mode 6. If the test has not completed, this TID will display '0'. Any other value indicates that the test has successfully completed.
- If the test has not completed, the drive cycle must be repeated.
- If the scan tool being used is not able to read TIDs, the only way to confirm that the test has run is to check for P1111 after running the 20 thou test, where applicable.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.