S6 V8-4.2L (BBD) (2004)
Engine Speed Sensor: Testing and Inspection
With Manufacturer's Scan Tool
Engine speed (RPM) sensor -G28-, checking
NOTE: The engine speed sensor is a combined speed sensor and reference mark sensor.
Checking engine speed sensor
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Before performing the check, ensure that the sensor is correctly installed and firmly seated.
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No debris or damage to speed sensor or wheel sensor.
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The thickness of the plate between the sensor and the automatic transmission must be 4.5 mm.
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Disconnect connector for engine speed sensor (identification: gray connector).
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Connect hand-held multimeter VAG 1526 (resistance test range) to contacts 2 and 3 on connector for engine speed sensor using test lead from
VAG 1594.
Specified value: approx. 450...1000 Ohm
NOTE:
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The resistance figure for the engine speed sensor is associated with a temperature of 20 degrees C.
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The resistance increases with increasing temperature.
If specification is not attained:
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Install a new engine speed sensor.
If the specified value is achieved:
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Connect VAG 1526 hand-held multimeter for resistance measurement between contacts 2 and 1 (Ground) as well as to contacts 3 and 1 (Ground).
Specified value: infinity Ohm in each case (no continuity).
If specification is not attained:
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Install a new engine speed sensor.
If the specified value is achieved:
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Check wiring between sensor connector and engine control module as follows:
Wiring connections between engine speed sensor and engine control module
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Connect test box VAG 1598/31 to wiring harness for engine control module; do not connect engine control module. See: Testing and