With Manufacturer's Scan Tool

Engine Speed Sender, Checking

The engine speed sender (G28) is a speed and reference mark sender. The engine will not start if there is no speed signal. If the speed signal fails when the engine is running, it will cause the engine to stall immediately.

Special tools, test equipment and auxiliary items
- Test box V.A.G 1598/31
- Hand multimeter V.A.G 1526 or multimeter VAG 1715
- Adapter set V.A.G 1594
- Wiring diagram

Test sequence
- Separate grey 3-pin connector -arrow- to engine speed sender.







- Measure sender resistance between contacts 2 + 3 of connector to sender.
Specification: 730 - 1000 Ohms
- Check the sender for short between contacts 1 + 2 as well as 1 + 3
Specification: Infinity Ohms

If the specifications are not obtained:
- Replace engine speed sender (G28), item 8.
- Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory, checking and erasing DTC memory. Refer to "Displaying, Reading and Erasing Trouble Codes/With Manufacturers Scan Tool/DTC Memory, Checking And Erasing", Testing and Inspection
- Read-out the readiness code. If the DTC memory has been erased or the engine control module was disconnected from permanent positive, the readiness code must be generated again.
Refer to "Monitors Trips and/or Drive Cycle/Displaying Readiness Code", Testing and Inspection
Refer to "Monitors Trips and/or Drive Cycle/Generating Readiness Code", Testing and Inspection

If no sender malfunction is detected:
- Remove inner plenum chamber cover, left:







- Connect test box V.A.G 1598/31 to control module wiring harness. The engine control module is not connected by this action.







- Check wiring for open circuit between test box and 3-pin connector using wiring diagram.
- Contact 1 + socket 108
- Contact 2 + socket 90
- Contact 3 + socket 82
Wire resistance: Max. 1.5 Ohms
- Additionally check wires for short to one another.

If no wiring problem is detected:
- Remove sender and check sender wheel for secure fit, damage and run-out.


NOTE: There is a larger gap on the sender wheel. This gap is the reference mark and does not mean that the sender wheel is damaged.


If no malfunction is detected on sender wheel:
- Replace Engine Control Module (ECM).