Testing and Inspection of Engine Speed Sensor with Generic Scan Tool for Jetta L4-18L Turbo
Engine Speed Sensor: Testing and Inspection
With Manufacturer's Scan Tool
Engine Speed (RPM) Sensor -G28-, Checking
The engine speed sensor (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 and equipment
-
VAG1551 scan tool or VAG1552 mobile scan tool with VAG1551/3B cable
-
VAG 1598/31 test box
-
VAG1526 hand multimeter or VAG1715 multimeter
-
VAG1594 adapter set
-
Wiring diagram
Test sequence
-
Separate gray 3 pin connector -1- to engine speed sensor.
-
Measure sensor resistance between contacts 2 + 3 of connector to sensor.
Specification: 730 to 1000 Ohm
-
Check sensor for short between contacts 1 + 2 as well as 1 + 3.
Specification: Infinity Ohm
If the specifications are not obtained:
-
Replace engine speed sensor (G28).
-
Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory,Checking and Erasing DTC Memory. Refer to
"Displaying and Reading Trouble Codes/With Manufacturer's Scan Tool/Check DTC Memory (Function 02)" See: Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes/Reading Diagnostic Trouble Codes/With Manufacturer's Scan Tool/DTC Memory