Throttle Drive and Angle Sensor For Throttle Drive, Checking

NOTE: Throttle drive -G186- and angle sensor -1- for throttle drive -G187- are located in the throttle valve control module -J338-.


Test conditions
- Throttle valve in closed throttle position; if necessary adjust accelerator pedal cable
- Cruise control adjustment OK
- Power supply for throttle valve control module OK; checking.
- Engine coolant temperature at least 80 °C (176 °F)
- Automatic transmission selector lever in "P" or "N"

Checking
- Connect VAG 1551 or VAG 1552 scan tool and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (with engine running at idle).

Indicated on display


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input.

Indicated on display


Read Measuring Value Block HELP
Input display group number XXX


- Press buttons -0-, -5- and -5- to input display group number 55 (055), and press -Q- button to confirm input.

Indicated on display (1-4 display fields)


Read Measuring Value Block 55 ->
1 2 3 4


- Compare display with specified values for idle air control (display fields 1-4):

Display Group 55:

If displayed values are OK:
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
- Switch ignition off.

Evaluation of display group 55







Explanation of 4-digit display







Continuation
- Switch ignition off.
- Connect VAG 1598/22 test box to ECM harness connector.
- Switch ignition on.
- With throttle valve in closed throttle position, connect multimeter US1119 (Fluke 83 or equivalent), and check resistance between ECM/test box sockets 59 and 66.
- Specified value: 3 - 200 ohms

If resistance is NOT OK:
- Disconnect 8-pin harness connector from throttle valve control module -J338-







- Check wiring for open circuit between ECM/test box and 8-pin throttle valve control module harness connector.
- Connector terminal 1 to ECM/test box socket 66
- Connector terminal 2 to ECM/test box socket 59
- Connector terminal 7 to ECM/test box socket 67
- Connector terminal 8 to ECM/test box socket 74
- Specified value: max. 1.5 ohms

- Check wiring of 8-pin connector for short circuit between wires, according to wiring diagram.
- Connector terminal 1 to ECM/test box socket 59
- Connector terminal 1 to ECM/test box socket 74
- Connector terminal 1 to ECM/test box socket 67
- Connector terminal 2 to ECM/test box socket 67
- Connector terminal 2 to ECM/test box socket 74
- Connector terminal 7 to ECM/test box socket 74
- Specified value: Infinity ohms

If wiring is OK:
- Carry out adaptation of throttle valve control module to ECM.
- Check readiness code. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code.