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Computers

Computers. Computers. Use inputs to control outputs. Inputs. Most are from sensors Will usually be either an analog or digital voltage Most will supply an input similar to a potentiometer or have a varying frequency AC or DC signal. Input types. Insert sensor types here but shorten.

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Computers

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Presentation Transcript

  1. Computers

  2. Computers • Use inputs to control outputs

  3. Inputs • Most are from sensors • Will usually be either an analog or digital voltage • Most will supply an input similar to a potentiometer or have a varying frequency AC or DC signal

  4. Input types • Insert sensor types here but shorten

  5. Specific inputs • Insert sensors here but shorten

  6. Trouble codes • A code stored in a computer to identify a specific type of fault • Indication that something has gone outside of normal operating parameters for a specific period of time • A function of the computer’s self diagnostic capabilities

  7. OBD1 (on-board diagnostics one) • Began in late 1970s but was not made mandatory by federal govt. until 1990s • Required all vehicles to perform self diagnostics to identify some major failures that can cause excessive emissions • Most trouble codes could be flashed out on an indicator lamp

  8. OBD2 (on-board diagnostics two) • Started appearing in 1994 and made mandatory on most vehicles in 1996 • Requires all vehicles to identify any failure that will result in exceeding the FTP by 1.5% • This includes identifying old catalytic converters, missfires, and evaporative systems failures

  9. OBD2 • Trouble codes are now universal and require the use of a scan tool to read • DLC is now universal

  10. Trouble code access • Can be gained by various methods: • Grounding a wire and counting flashes of bulb • Grounding a wire and counting pulses of volt meter • Unplugging the coolant temperature sensor and counting flashes

  11. Trouble code access • Can be gained by various methods: • Cycling the key on and off three times and counting the flashes • Through the data stream via a scan tool

  12. Trouble code types • Current vs. History • Just because the light is on does not mean problem is occurring • Hard vs. Soft

  13. Trouble code diagnosis • If problem is occurring; use published diagnostics and grey matter • If problem is not occurring; the published diagnostics and charts can help but in almost every case can not be used directly • If a vehicle has multiple codes, look for commonalties • One malfunction can set multiple codes

  14. The End

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