With Manufacturer's Scan Tool
Throttle Valve Control Module, Checking
Components of throttle valve control module -J338-: Throttle drive (power accelerator actuation) -G186-, angle sender 1 for angle sensor -1- for throttle drive (power accelerator actuation) -G187- and angle sensor -2- for throttle drive (power accelerator actuation) -G188-.
NOTE:
- If the throttle valve control module is replaced, the new control module must without fail be adapted to the engine control module.
- On vehicles equipped with an automatic transmission the transmission control module must also be adapted.
Special tools and equipment 1
- V.A.G1551 scan tool or V.A.G1552 mobile scan tool with V.A.G1551/3B cable V.A.G1598/31 test box
- V.A.G1526 or Fluke 83 multimeter
- V.A.G1594 adapter set
- Wiring diagram Test conditions
Test conditions
- Throttle valve not damaged or dirty.
- Coolant temperature must be at least 80 degrees C, see display group 04, display zone 3.
Test sequence
- Connect the V.A.G1551 scan tool (V.A.G1552). Then switch ignition on and select engine control module with the "Address word" 01.(Connecting scan tool and selecting engine control module. [1][2][3]Connecting VAG 1551 Scan Tool)
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, 6 and 2 for the "Display group number 62" and confirm entry with Q key.
Indicated on display: (1 to 4 = Display zones)
Read measured value block 62 "
1 2 3 4
- Check angle sensor -1- for throttle drive (power accelerator actuation) -G187- in display zone 1
Specification: 3 to 93%
- Check angle sensor -2- for throttle drive (power accelerator actuation) -G188- in display zone 2.
Specification: 97 to 3%
- Depress accelerator slowly to wide open throttle position and observe angles displayed in display zones 1 and 2:
The percentage figure in display zone 1 must increase evenly, although the tolerance range 3 to 93% will not be fully exploited.
The percentage figure in display zone 2 must decrease evenly, although the tolerance range 97 to 3% will not be fully exploited.
NOTE:
- The reason why the display in display zone 1 increases and the display in display zone 2 decreases is because the potentiometers (angle senders) in the throttle valve control module run in opposite directions.
- This means that the voltage of one angle sender moves towards 5 volts.(The more the throttle valve is opened the higher the voltage; percentage figure increases).
- While the voltage of angle sender 2 decreases from 5 volts toward 0 volts. (The more the throttle valve is opened the lower the voltage; percentage figure decreases).
If the displays do not indicate as described:
- Press -> key.
- Press keys 0 and 6 for "End data transfer" function and confirm input with Q key.
- Switch ignition off.
- Connect V.A.G1598/31 test box to control module wiring harness. Engine control module remains disconnected.
- Measure resistance between throttle valve drive and contacts 117 and 118
Specification: 1 to 5 Ohms
If the specification is not obtained:
- Replace throttle valve control module -J338-.
- Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory.
- Read readiness code. If DTC memory has been erased or engine control module was disconnected from permanent positive, readiness code must be generated again.
Monitors, Trips, Drive Cycles and Readiness Codes
Monitors, Trips, Drive Cycles and Readiness Codes
If the specification is obtained:
- Check voltage supply of throttle valve control module and wiring to control module.
- Check accelerator pedal position sensor.
If the voltage supply and wiring is OK:
- Replace engine control module.
Checking voltage supply and wiring to control module
- Disconnect 6-pin connector -2- from throttle valve control module -1-.
- Connect multimeter to measure voltage to contacts 2 + 6 of connector.
- Switch ignition on.
Specification: min. 4.5 V
- Switch ignition off.
- Connect multimeter to measure voltage to contact 2 of connector and Ground (GND).
- Switch ignition on.
Specification: min. 4.5 V
- Switch ignition off.
If the specifications are not attained:
- Connect V.A.G1598/31 test box to control module wiring harness. Engine control module remains disconnected.
- Check wiring between test box and connector for open circuit using wiring diagram:
Contact 1 + socket 92
Contact 2 + socket 83
Contact 3 + socket 117
Contact 4 + socket 84
Contact 5 + socket 118
Contact 6 + socket 91
Wire resistance: max. 1.5 Ohms
- Check wires for short to one another.
- Check wiring for short to battery positive or Ground (GND).
If no wiring malfunciton is detected:
- Check engine control module voltage supply.