Throttle Valve Control Module, Checking

NOTE: You must perform Function 04 "Basic setting" if the Throttle Valve Control Module J338 is removed, installed or replaced. Function 04: Basic Setting, Performing

Special tools, testers and auxiliary items
- VAG 1551/1552 Scan Tool using VAG 1551/3 adaptor cable
- VAG 1598/18 Test Box
- Fluke 83 multimeter (or equivalent)
- VW 1594 Adaptor kit
- Wiring diagram

Voltage supply, checking







- Disconnect 8-pin Throttle Valve Control Module connector
- Switch Fluke 83 multimeter to 20 Volts range
- Connect multimeter between harness connector terminals 3 + 7 using jumper wires from VW 1594 adaptor kit
- Switch ON ignition
See specification: 9.0 to 14.5 Volts
- Connect multimeter between harness connector terminals 4 + 7
See specification: 4.0 to 6.0 Volts

- Switch OFF ignition

If specifications not obtained







- Connect VAG 1598/18 Test Box to ECM wiring harness







- Check for open circuit between Test Box and 8-pin harness connector using wiring diagram
- terminal 3 + socket 10
- terminal 4 + socket 41
- terminal 7 + socket 33
- wire resistance: Max. 1.5 Ohms
- Check wiring at 8-pin connector for short to one another
- terminal 7 + socket 10
- terminal 7 + socket 41
- terminal 4 + socket 33
- specification: Infinity Ohms
- Reconnect Throttle Valve Control Module

If wiring OK
- Replace Engine Control Module J220
- See 'Computers and Control Systems, Testing and Inspection, Procedures, Diagnosis With Scan Tool, Address Word 01, Function 15.' Testing and Inspection


If DTC memory has been erased
- Create Readiness code
See 'Computers and Control Systems, Testing and Inspection, Procedures, Diagnosis With Scan Tool, Address Word 01, Readiness Code Creating.' Testing and Inspection


Closed Throttle Position switch, checking
- Connect VAG 1551 (VAG 1552) Scan Tool
See 'Computers and Control Systems, Testing and Inspection, Procedures, Address word 01, VAG 1551 Scan Tool, connecting.' Testing and Inspection

- With engine idling, press 0 and 1 buttons to select Address Word 01: "engine electronics"

Display will appear as shown


Rapid data transfer HELP
Select function XX


- Press 0 and 8 buttons to select Function 08 "Read measuring value block"
- Press Q button to enter selection

Display will appear as shown


Read measuring value block HELP
Input display group number XXX


- Press 0, 0 and 5 buttons to select "Display group number 5"
- Press Q button to enter selection

Display will appear as shown (1 to 4 = Display zones)


Read measuring value block 5 ->
1 2 3 4


- Check Closed Throttle Position Switch (Display zone 4)

Display Group 5: General Engine Data:

Continuation
- Switch OFF ignition







- Connect VAG 1598/18 Test Box to ECM wiring harness
- Switch Fluke 83 multimeter to resistance range
- With closed throttle, connect multimeter between Test Box sockets 10 + 33
- specification: 5.0 Ohms maximum
- Slowly open throttle valve
- specification: Infinity Ohms

If specification not obtained
- Disconnect 8-pin Throttle Valve Control Module harness connector







- Check for open circuit between Test Box and 8-pin harness connector using wiring diagram
- terminal 3 + socket 10
- terminal 7 + socket 33
- wire resistance: 1.5 Ohms maximum
- Check wiring at 8-pin connector for shorting to one another
- terminal 7 + socket 10
- specification: Infinity Ohms
- Re-connect harness connector

If wiring OK
- Replace Throttle Valve Control Module
- Perform Basic setting. Function 04: Basic Setting, Performing
- Read-out Readiness code
See 'Computers and Control Systems, Testing and Inspection, Procedures, Diagnosis With Scan Tool, Address Word 01, Function 15.' Testing and Inspection

If DTC memory has been erased
- Create Readiness code
See 'Computers and Control Systems, Testing and Inspection, Procedures, Diagnosis With Scan Tool, Address Word 01, Readiness Code Creating.' Testing and Inspection