Checking the alternating current

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Ignition OFF

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Ignition off.
Raise the car so that the front wheels can rotate freely
Connect a voltmeter (in alternating current mode) or an oscilloscope between the terminals in the breakout box as follows:

terminals 6 and 7 (diagnostic trouble code (DTC) ABS-311), left front wheel

terminals 4 and 5 (diagnostic trouble code (DTC) ABS-312), right front wheel

terminals 8 and 9 (diagnostic trouble code (DTC) ABS-313), left rear wheel

terminals 1 and 3 (diagnostic trouble code (DTC) ABS-314), right rear wheel

Ignition on

Rotate the relevant wheel by hand.

NOTE: Check that one of the front wheels is locked when checking the front wheel sensor.

Fig 2: Breakout Box
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Fig 3: Identifying Voltmeter
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The voltmeter should read a variation in voltage of between 0-2 volts, depending on the speed of the wheel.

OK
Refer to Checking the control module connector
NOT OK
Refer to Checking the direct voltage