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HOMESERVICE MANUALSBMW2001Z8REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMEMISSIONS - OVERVIEWEMISSION OVERVIEWSYSTEM MONITORINGDRIVE CYCLE
2001 BMW Z8

Drive Cycle

2001 BMW Z8SECTION Drive Cycle

The following diagram shows how a drive cycle is set (test drive) in order for all the systems to be monitored once. The test conditions can be created in any desired order after startup.

Fig 1: Identifying Drive Cycle Graph
G03394786Courtesy of BMW OF NORTH AMERICA, INC.
  1. Engine cold start, idling, approximately 3 minutes. Evaluated:
    • Secondary Air System 
    • Evaporative Leak Detection (LDP Equipped Vehicles) 
  2. Constant driving at 20 to 30 MPH, approximately 4 minutes. Evaluated:
    • Oxygen Sensors - Achieved "Closed Loop" Operation 
    • Oxygen Sensors - Response Time and Switching Time (Control Frequency) 
  3. Constant driving at 40 to 60 MPH, approximately 15 minutes (sufficient vehicle coasting phases included). Evaluated:
    • Catalytic Converter Efficiency 
    • Oxygen Sensors - Response Time and Switching Time (Control Frequency) 
  4. Engine idling, approximately 5 minutes. Evaluated:
    • Tank-Leak Diagnosis (DM TL Equipped Vehicles after KL 15 is switched OFF) 
NOTE: The diagnostic sequence illustrated above will be interrupted if:
  • The engine speed exceeds 3000 RPM. 
  • The driving speed exceeds 60 MPH. 
  • Large fluctuations in the accelerator pedal position. 
RENDER: 1.0x

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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.