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Vanagon ECU System Overview For the 8691V ECU Monitor System to work for you effectively, it is important that your engine be tuned to it’s best possible running condition. Spark plugs, spark plug wires, distributor cap and rotor should first be replaced. Electrical Wiring There is not enough room to reproduce the various electrical wiring diagrams that might apply to your particular Vanagon. The wiring references in this document refer to the wiring diagrams on pages 97.201 – 97.233. Digifant System Components. Electronic Control Unit (or ECU), Injection duration opening signals are provided based on the following inputs: Engine speed • Intake air volume • Coolant temperature • Oxygen content in the exhaust gas • Battery voltage • Intake air temperature. Coolant Temperature Sensor The coolant temperature sensor is a negative temperature coefficient resistor (NTC). The voltage signal it produces is used by the control unit to determine. Intake Air Temperature Sensor An intake air temperature sensor is located in the airflow sensor housing. It is a negative temperature coefficient (NTC) resistor, which means its resistance value drops as the temperature increases. Oxygen Sensor The oxygen sensor is made of a ceramic material called Zirconium Dioxide. The inner and outer surfaces of the ceramic material are coated with platinum. The sensor is electrically heated to keep it at a constant operating temperature. This insures continuous and accurate reaction of the sensor during all operating conditions. The oxygen sensor should be replaced every 60,000 miles. Ignition System. The engine coolant temperature sensor signals the ECU to determine ignition timing based on engine temperature.

Tags : coolant temperature sensor, electrical wiring diagrams, volume coolant, intake air temperature sensor, ntc resistor, negative temperature coefficient, engine coolant temperature sensor, intake air temperature, engine coolant temperature, electronic control unit, airflow sensor, oxygen sensor, resistance value, oxygen content, outer surfaces

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