SEAT Workshop Service and Repair Manuals

Components of the throttle valve control part (J338):
Throttle valve positioner (V60), throttle valve positioner sender (G127), throttle valve potentiometer (G69) and idling switch (F60)

Note:

If the throttle valve control part is renewed, the engine control unit () and for vehicles with automatic gearbox, the automatic gearbox control unit must without fail be matched to the new control part.

=> Automatic gearbox 099, self-diagnosis; Repair group 01; Performing self-diagnosis; Introduce basic settings

Special tools, workshop equipment, 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 1598/22
• ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
• ◆ Adapter set V.A.G 1594
• ◆ Current flow diagram

Test conditions

• ● Throttle valve not damaged or dirty.

Checking idling switch (F60)

• ‒ Connect the fault reader V.A.G 1551 (V.A.G 1552). Then switch ignition on and select engine control unit with the "Address word" 01.
  (Connecting fault reader and selecting engine control unit .)

• ‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.

• ‒ Press keys 0, 9 and 8 for "Display group number 98" and confirm entry with Q key.

• ‒ Check the operating mode display in display zone 3.
      Display: Idling
• ‒ Slowly open throttle valve. After free travel, a stop is reached when opening throttle valve further the 4th position from left must jump to part throttle
      Display: Part throttle

Display constantly remains on one operating condition:

Continuation of check when display shows part throttle

• ‒ → Pull 8 pin connector off throttle valve control part.
• ‒ Bridge connector contacts 3+7 with aux. cables from V.A.G 1594 and observe display.

If display jumps to idling:

• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
• ‒ Switch off ignition.
• ‒ Replace throttle valve control part (J338).

If display remains on idling:

• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
• ‒ Switch off ignition.
• ‒ Check voltage supply of throttle valve control part and wiring to control unit => Page 24-42.

If the voltage supply and wiring is OK:

• ‒ Renew engine electronics control unit => Page 24-105.

Continuation of check when display constantly shows idling

• ‒ → Pull 8 pin connector off throttle valve control part.

If display jumps to part throttle:

• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
• ‒ Switch off ignition.
• ‒ Replace throttle valve control part (J338).

If display remains on part throttle:

• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
• ‒ Switch off ignition.
• ‒ Check voltage supply of throttle valve control part and wiring to control unit => Page 24-42.

If the voltage supply and wiring is OK:

• ‒ Renew engine electronics control unit => Page 24-105.

Checking throttle valve positioner (V60) and sender for throttle valve positioner (G127)

Test conditions

• ● Coolant temperature at least 85 °C.

Test sequence

• ‒ Connect fault reader V.A.G 1551 (V.A.G 1552). Start engine and select "Address word" 01 of engine control unit. When doing this the engine must be running at idling speed.
  (Connecting fault reader and selecting engine control unit => Page 01-5.)

• ‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.

• ‒ Press keys 0, 0 and 3 for "Display group number 3" and confirm entry with Q key.

• ‒ Check whether the coolant temperature is above 85 °C in display zone 3.
• ‒ Change to display group 98 as follows:
• ‒ Press C key.

• ‒ Press keys 0, 9 and 8 for "Display Group 98" and confirm entry by pressing Q.

• ‒ Check voltage figure from throttle valve positioner sender in display zone 2. The voltage must be between
      0.0...5.0 V

If the specification is not obtained:

• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
• ‒ Switch off ignition.

• ‒ → Pull 8 pin connector off throttle valve control part.
• ‒ Measure resistance of throttle valve positioner between following contacts:
      Contact 1 + 2
      Specification: 3...200 ω

If the specification is not obtained:

• ‒ Replace throttle valve control part (J338).

If the specification is attained:

• ‒ Check voltage supply of throttle valve control part and wiring to control unit => Page 24-42.

Checking throttle valve potentiometer (G69)

Test conditions

• ● Coolant temperature at least 85 °C.

Test sequence

• ‒ Connect the fault reader V.A.G 1551 (V.A.G 1552). Then switch ignition on and select engine control unit with the "Address word" 01.
  (Connecting fault reader and selecting engine control unit => Page 01-5.)

• ‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.

• ‒ Press keys 0, 0 and 3 for "Display group number 3" and confirm entry with Q key.

• ‒ Check whether the coolant temperature is above 85 °C in display zone 3.
• ‒ Change to display group 1 as follows:
• ‒ Press C key.
• ‒ Press keys 0, 0 and 1 for "Display group number 1" and confirm entry with Q key.

• ‒ Read off throttle valve angle in display zone 3.
      Throttle valve in start position: 1...7 <°

• ‒ Open throttle valve slowly until fully open and observe angle displayed in display zone 3. The figure must increase uniformly over
  the complete range
      up to a min. 80 <°.
• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
• ‒ Switch off ignition.

Note:

The displayed figure is dependent on the tolerances of the throttle valve potentiometer and does not correspond to the actual opening angle.

If the figure does not increase uniformly:

• ‒ Replace throttle valve control part (J338).

If the display constantly shows 0 <° or is above 90 <°:

Continuation of check when display 0 <°:

• ‒ → Pull 8 pin connector off throttle valve control part.
• ‒ Bridge connector contacts 5+7 with auxiliary cables from V.A.G 1594 and observe display.

If display jumps above 90 <°:

• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
• ‒ Switch off ignition.
• ‒ Replace throttle valve control part (J338).

If display remains at 0 <°:

• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
• ‒ Switch off ignition.
• ‒ Check voltage supply of throttle valve control part and wiring to control unit => Page 24-42.

If the voltage supply and wiring is OK:

• ‒ Renew engine electronics control unit => Page 24-105.

Continuation of check when display is above 90 <°:

• ‒ → Pull 8 pin connector off throttle valve control part.

If display jumps to 0 <°:

• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
• ‒ Switch off ignition.
• ‒ Replace throttle valve control part (J338).

If display remains above 90 <°:

• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
• ‒ Switch off ignition.
• ‒ Check voltage supply of throttle valve control part and wiring to control unit => Page 24-42.

If the voltage supply and wiring is OK:

• ‒ Renew engine electronics control unit => Page 24-105.

Checking voltage supply and wiring to control unit

• ‒ → Pull 8 pin connector off throttle valve control part.
• ‒ Connect multimeter to measure voltage at connector contacts 4+7.
• ‒ Switch on ignition.
      Specification: min. 4.5 V

• ‒ Connect multimeter to measure voltage at connector contacts 3+7.
      Specification: at least 9 V
• ‒ Switch off ignition.

If the specifications are not attained:

• ‒ → Connect test box V.A.G 1598/22 to control unit wiring harness.

• ‒ → Check wiring for open circuit between test box and connector using current flow diagram:
      Contact 1+socket 66
      Contact 2+socket 59
      Contact 3+socket 69
      Contact 4+socket 62
      Contact 5+socket 75
      Contact 7+socket 67
      Contact 8+socket 74
      Wire resistance: max. 1.5 ω
• ‒ Additionally check wires for short to one another.
      Specification: ∞ω

If no wiring fault is detected:

• ‒ Check engine control unit voltage supply => Page 24-100.