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Leon Mk2

Diesel direct injection and glow plug system
Servicing Diesel direct injection system
Checking coolant temperature sender

Special tools, testers, measuring instruments and auxiliary items required

  • ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3
  • ◆ Test box V.A.G 1598/18
  • ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
  • ◆ Adapter set V.A.G 1594
  • ◆ Current flow diagram

Test sequence

  • ‒ Connect fault reader V.A.G 1551 (V.A.G 1552) and select engine electronics control unit with the "Address word" 01. When doing this the engine must be running at idling speed.
    (Connecting fault reader and selecting engine electronics control unit .)
 
→ Indicated on display:
Rapid data transfer    HELP
Select function XX
  • ‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.
 
→ Indicated on display:
Read measured value block    HELP
Input display group number XXX
  • ‒ Press keys 0, 0 and 7 for "Display group number 7" and confirm entry with Q key.
 
→ Indicated on display:
Read measured value block 7    ⇒
15.4 5C        15.9 5C    16.7 5C
  • ‒ Observe coolant temperature figure in display zone 4. The temperature figure must
        Increase uniformly and without interruption.
  • ‒ In case of faults the fuel temperature is displayed as a substitute.
  • ‒ If no realistic display appears in display zone 4 or the fuel temperature is displayed as a substitute. Check coolant temperature sender and wiring connections to sender as follows:
    		•
     
    N23-0079
    • ‒ Press the ⇒key.
    • ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
    • ‒ Switch off ignition.
    • ‒ → Pull connector off coolant temperature sender -1-.
    • ‒ Measure resistance between sender contacts 1+3.
     
    N24-0157
    • → Specification see diagram

    Scale A shows resistance values for temperature range 0...50 °C and scale B the values for temperature range 50...100 °C.

    Examples:

    • ◆ 30 °C corresponds to a resistance from 1500...2000 ω
    • ◆ 80 °C corresponds to a resistance from 275...375 ω

    If the specification is not obtained:

    • ‒ Replace coolant temperature sender (G62).
     
    N24-0219

    If the specification is obtained:

    • ‒ Remove dash panel insert:

    => Electrical system; Repair group 90; dash panel insert; removing and installing dash panel insert

    • ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.
     
    N23-0020
    • ‒ → Check wiring between test box and 4 pin connector for open circuit according to current flow diagram.
          Contact 1+ socket 33
          Contact 3+ socket 14
          Wire resistance: max. 1.5 ω
    • ‒ Additionally check wires for short to one another, to vehicle earth and to battery positive.
          Specification: ∞ω

    If no wiring fault is detected:

    • ‒ Renew Diesel direct injection system control unit (J248) => Page 23-5, item 9.

    Checking brake light switch and brake pedal switch > < Checking intake manifold pressure sender