Land Rover Freelander 2005 On-Board Diagnostics

The Freelander Petrol Engine Management System (EMS) for North American Specification vehicles consists of the Siemens MS43 ECM controlling the 2.5L KV6 engine. The Engine Control Module (ECM) uses the inputs from sensors to control engine performance and restrict emissions in line with Onboard Diagnostics II (OBDII). These sensors include a Mass Airflow (MAF) sensor, Throttle Position (TP) sensor, Engine Coolant Temperature (ECT) sensor and Oxygen (O2) sensors. The ECM also receives vehicle data, such as road speed from other control modules. The Central Processor Unit (CPU) within the ECM processes all of these inputs, applies correction factors, such as short and long term fuel trim, and issues commands to the engine actuators, injection valves and coils.

OBD Drive Cycle Information
Drive Cycle A

  1. Switch ignition on for 30 seconds
  2. Ensure Engine Coolant Temperature (ECT) less than 60 oC (140 oF)
  3. Start Engine
  4. Engine idle for 2 minutes
  5. Connect a generic scan tool and check for fault codes

Drive Cycle B

  1. Switch ignition on for 30 seconds
  2. Ensure Engine Coolant Temperature (ECT) less than 60 oC (140 oF)
  3. Start Engine
  4. Allow engine to idle for 2 minutes
  5. Perform 2 light accelerations (0 to 35 mph with light pedal pressure)
  6. Perform 2 medium accelerations (0 to 45 mph with moderate pedal pressure)
  7. Perform 2 hard acceleration (0 to 55 mph with heavy pedal pressure)
  8. Allow engine to idle for 2 minutes
  9. Connect a generic scan tool with engine still running and check for fault code

Drive Cycle C

  1. Switch ignition on for 30 seconds
  2. Ensure Engine Coolant Temperature (ECT) less than 60 oC (140 oF)
  3. Start Engine
  4. Allow engine to idle for 2 minutes
  5. Perform 2 light accelerations (0 to 35 mph with light pedal pressure)
  6. Perform 2 medium accelerations (0 to 45 mph with moderate pedal pressure)
  7. Perform 2 hard acceleration (0 to 55 mph with heavy pedal pressure)
  8. Cruise at 60 mph for 8 minutes
  9. Cruise at 50 mph for 3 minutes
  10. Allow engine to idle for 3 minutes
  11. Connect a generic scan tool with engine still running and check fo

Drive Cycle C+

  1. This is an extended drive cycle C to enable the internal diagnostic process to be completed which is not alone achieved by drive cycle C.
  2. Please perform the additional portion after completing drive cycle C (after completing the three minute idle) when prompted by T4/TestBook.
  3. Perform medium acceleration to 60 mph and hold for 10 seconds
  4. Remove foot from gas pedal and decelerate to 50 mph.
  5. Re-perform medium acceleration to 60 mph and hold for 10 seconds
  6. Again decelerate to 50 mph.
  7. Repeat this another 13 times until 15 acceleration/decelerations cycles have been completed
  8. Connect a generic scan tool with engine still running and check for fau

The exhaust system consists of two separate branches with one catalytic converter in each bank and each catalyst is monitored independently of the other. The signals of both the up-stream control exhaust gas oxygen sensor and the corresponding down-stream monitoring sensor are used for the diagnosis of the catalyst. If the catalyst has a good conversion capability then the lambda deviations, which are produced by the feedback control system are smoothed by the oxygen storage capacity of the catalyst. If the catalyst has reduced conversion capability due to aging, poisoning or misfire, then the lambda deviations produced in front of the catalyst are also visible after the catalyst. The downstream exhaust gas oxygen sensor measures these post-catalyst lambda deviations.

Land Rover Freelander 2005 On-Board Diagnostics

Land Rover Freelander 2005 On-Board Diagnostics For Free

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