Allroad Quattro V6-2.7L Turbo (APB) (2002)
Engine Speed Sensor: Testing and Inspection
Engine Speed (RPM) Sensor -G28-, Checking
Engine Speed (RPM) Sensor -G28, Checking
NOTE: The engine speed sender is a combined speed sender and reference mark sender Without a signal from the Engine Speed (RPM) sensor - G28
the engine cannot be started. If the signal from the Engine Speed (RPM) sensor -G28 fails while the engine is running, the engine will cut out
immediately.
Checking Engine Speed (RPM) sensor
-
Before carrying out test, make sure that sensor is correctly installed and firmly seated.
-
Disconnect harness connector for Engine Speed (RPM) sensor (grey connector).
-
Connect multimeter (Fluke 83 or equivalent) (resistance test range) to terminals 2 and 3 on connector for engine speed sensor using test lead from
VAG1594 connector test kit
Specification: approx. 730 - 1000 ohm
NOTE:
-
The resistance value for the engine speed sensor is based on a temperature of 20 °C
-
The resistance increases as the temperature rises.
If the specification is not attained:
-
Replace engine speed sensor.
If the specification is attained:
-
Connect multimeter (Fluke 83 or equivalent) (resistance test range) between terminals 2 and 1 (Ground (GND)) and between terminals 3 and 1
(Ground (GND)).
Specification: R Ohms (infinite Ohms / open circuit) in each test
If the specification is not attained:
-
Replace Engine Speed (RPM) sensor.
If the specification is attained:
-
Check wiring between sensor connector and engine control module as follows:
-
Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to the engine control module itself. Refer to "Scan
Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1598/31 Test Box" See: Testing and Inspection