Electronic Throttle Actuator Position Sensor: Testing and Inspection

Angle sensor -1- for throttle drive (power accelerator actuation) - G187 and Angle sensor -2- for throttle drive (power accelerator actuation) -G188, checking

The angle sensor -1- for throttle drive (power accelerator actuation) -G187 and angle sensor -2- for throttle drive (power accelerator actuation) -G188 inform the Engine Control Module (ECM) of the position of the throttle valve. Both angle sensors are located in the throttle valve control module.

If a malfunction relating to angle sensor -1- for throttle drive (power accelerator actuation) -G187 and angle sensor -2- for throttle drive (power accelerator actuation) -G188 is stored in the DTC memory, check voltage supply to throttle valve control module.

Checking voltage supply to throttle valve control module

- Check fuse for throttle valve control module.

If the fuse is OK:
- Disconnect harness connector from throttle valve control module.
- Switch ignition on.







- Connect multimeter (voltage range) between the following sockets on the connector:

6-pin connector on Specification
wiring harness, socket
2 + Ground (GND) approx. 5 V
2 + 6 approx. 5 V

If the specifications are not obtained, test wiring connections from engine control module to throttle valve control module.

If the readouts match the specifications, test also the signal wires and activation wires for the throttle valve positioner.

Checking wiring for voltage, signal and activation

- Connect VAG 1598131 test box to wiring harness for engine control module. DO NOT connect to engine control module itself, Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1598/31 Test Box" Testing and Inspection







Test the following wiring connections for open circuits and short to B+ or Ground (GND).

6-pin connector on VAG 1598/31
wiring harness, socket test box socket
1 92
2 83
3 117
4 84
5 118
6 91

Resistance in wiring: max. 1.5 ohm

- Correct any open/short circuit as necessary.

If no wiring malfunction is detected:
- Replace throttle valve control module.
- Display readiness code, Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Displaying Readiness Code" Testing and Inspection . Readiness code must be generated if DTC memory was erased, Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code" Testing and Inspection