Throttle Drive and Angle Sensor For Throttle Drive, Checking
Required special tools and test equipment
- VAG 1551 or VAG 1552 Scan Tool (ST) with VAG 1551/3 adapter cable
- VAG 1598/22 test box
- Multimeter US 1119 (Fluke 83 or equivalent)
- VW 1594 connector test kit
- Wiring diagrams
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.
- 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
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):
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
NOTE: The increased speed (raised RPM) on vehicles with front-wheel drive is attained if there is power supplied (B+, 15er) to terminal 10 of the engine control module.
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 multi- meter US 1119 (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.