Showing posts with label engine control unit. Show all posts
Showing posts with label engine control unit. Show all posts

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)