AUTO LOGIC DIAGNOSIS

Component and circuit defects are detected by the ECM and logged in its defect code memory where they are accessible using diagnostic equipment such as Auto logic or Land Rover’s own test Book system. By connecting to the diagnostic socket under the dashboard, Auto logic can read the stored fault codes and can also interrogate the signals being sent and received by the ECM. The characteristics of the signal can tell and experienced operator much about the state of the engine and the DDE system components and circuits. Contrary to popular belief, this information is not necessarily displayed instantly it’s gained only by having a thorough understanding and interrogating the systems.

The injection timing solenoid and its signal characteristics can be monitored and interrogated in the timing modulation section of Auto logic, fuel quantity can be diagnosed by observing the signals associated with the fuel quantity servo system, and a procedure can be carried out to test the servo. Diesel engine electronic control is one of the least troublesome systems on the P38. In most cases, electronic diagnosis is the most efficient and often the only way to identify the causes of running and starting problems.