Checking ground wire

• Connect multimeter as follows to measure voltage:
  CMP SENSOR CIRCUIT TEST: GROUND WIRE
  
  

  Connector terminal	Measure to
  3	Battery positive

  • Specified value: approx. 10 V
Fig 1: Identifying CMP Sensor 3-Pin Harness Connector Terminals
Courtesy of AUDI OF AMERICA, INC.
• Repair any open/short circuit as necessary.

  If the specified values are all achieved and the LED test light does not flash (measured between terminals 1 and 2 with starter connector attached):

• Install a new CMP sensor.

If the specified values are not obtained: