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Home >> Jaguar >> 1996 >> XJS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self Diagnostics >> Drive Cycles >> Service Drive Cycle
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Service Drive Cycle

NOTE: Required gear changes must be between gears, not between Neutral and Drive.
  1. Allow the car to soak at room temperature until the coolant temperature reaches 140°F (60°C).
  2. Start the engine.
  3. Idle engine for approximately 8 minutes; diagnostics such as a misfire, sensors and actuators will run and produce an outcome. An additional test requiring the engine to run for 15 minutes is present, thus a long idle period is the most appropriate method consuming time without excessive miles being clocked.
  4. Accelerate in drive (maximum gear 3rd engine speed 2000 RPM, wide open throttle), up an incline to maintain a high load for approximately 10 seconds. This will test the Neutral Drive switch and Road Speed diagnostics.
  5. Drive as normal, while driving, change through the gears briskly such that 40 gear changes are requested. This further tests the Neutral Drive Switch.
  6. Accelerate in drive to a target road speed in the range of 35-45 MPH. Cruise at target speed, preferably in a flat surface to achieve a steady load. Attempt to maintain the speed for a duration of approximately 3 minutes. This allows adaptations and the Catalyst monitoring routine within the system to take place.
  7. Bring engine to idle and park.
  8. Rev the engine to 1500-2000 RPM for a duration of approximately one minute.
  9. Wait at idle for a period of 2 minutes.
  10. Using a Generic Scan Tool, establish communication with vehicle and determine faults, if any.
  11. Turn engine off.
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