Monday, November 16, 2009

What does the Measured Value block group 000 values tell you?

When you look at the Measured Values/Basic Settings in Group 000 in VAG-COM for the AAT up to 2nd control unit version engine you will see a group of 10 values in a row.

I've also included normal values measured during three different engine modes

Engine Stopped: Self explaining (with ignition key on)
Engine Idle: Idle, Warm engine, temp. at least 80 degrees C
Full Throttle: Warm engine, temp at least 80 degrees C. TEST DRIVE Accelerate the vehicle in 3rd gear (engine code AEL: in 4th; with automatic transmission: in gear 2) at full throttle (without kickdown) from overrun while a second mechanic observes the rev counter. Start logging in VAG-COM at 3000 rpm, do not exeed 4400 rpm (engine governed but keep an eye on the rev counter).


(Starting with row 1 at the left side of the VAG-COM screen.)
  1. Engine Speed

    • Engine Stopped: 0
    • Engine Idle: 33-36 OK
    • Full Throttle: 140-190 (190 = 4400rpm, not to be exeeded)

  2. Commencement of injection

    • Engine Stopped: undefined
    • Engine Idle: 45-60 OK
    • Full Throttle: 190-210 (depending on engine speed)

  3. Accelerator pedal position (max 255)

    • Engine Stopped: Press pedal to see value rise
    • Engine Idle: 0 (not pressed)
    • Full Throttle: 255 (floored)
  4. Injection Quantity

    • Engine Stopped: 0
    • Engine Idle:5-25 OK
    • Full Throttle: 115-125 OK (80 = emergency injection quantity)

  5. Intake manifold pressure

    • Engine Stopped: 117 at approx 1000 mbar
    • Engine Idle: 117 at approx 1000 mbar
    • Full Throttle: 210-235 (1.72 - 1.92 bar) OK

  6. Ambient Pressure

    • Engine Stopped: 240 at approx 1000mbar
    • Engine Idle: 240 at approx 1000mbar
    • Full Throttle: Ignore

  7. Coolant Temperature

    • Engine Stopped: 195 at approx 20 degrees C
    • Engine Idle: 62 at approx 90 degrees C
    • Full Throttle: Ignore

  8. Intake Air Temperature

    • Engine Stopped: 195 at approx 20 degrees C
    • Engine Idle: 177 at approx 30 degrees C
    • Full Throttle: Ignore

  9. Fuel Temperature

    • Engine Stopped: 90 at approx 20 degrees C
    • Engine Idle: 175 at approx 55 degrees C
    • Full Throttle: Ignore

  10. Intake Air Quantity

    • Engine Stopped: Ignore
    • Engine Idle: 41-75 (if EGR is working normally, if higher briefly press acc. pedal)
    • Full Throttle: at least 190 OK (<190 check airflow meter)

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