Vauxhall Workshop Service and Repair Manuals

Test

Work Order Description

Nominal Value

Check: Interruption of Voltage Supply Circuit

• Ignition OFF
• Disconnect wiring harness connector from:
  B166 Sensor - Oxygen, Mixture Control, Heated
• Ignition ON
• Measure voltage between the following terminals:
  B166 Sensor - Oxygen, Mixture Control, Heated
  Wiring harness connector (wiring harness side) terminal 1
  &
  Ground

greater than 11 V

Check: Circuit Interruption of Ground Circuit

• Ignition OFF
• Disconnect wiring harness connector from:
  M3 Motor - Radiator Fan
  and
  A84 Control Unit - Engine
• Measure resistance between the following terminals:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 49 (XC1)
  &
  B166 Sensor - Oxygen, Mixture Control, Heated
  Wiring harness connector (wiring harness side) terminal 2

less than 5 Ohm

Result

Cause Of Fault

• Defective component:
  B166 Sensor - Oxygen, Mixture Control, Heated
  or
  A84 Control Unit - Engine

• Circuit interruption between:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 49 (XC1)
  &
  B166 Sensor - Oxygen, Mixture Control, Heated
  Wiring harness connector (wiring harness side) terminal 2

• Circuit interruption between:
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 29 (XE3)
  &
  B166 Sensor - Oxygen, Mixture Control, Heated
  Wiring harness connector (wiring harness side) terminal 1

or

• Defective component:
  X125 Underhood Electronic Module

Important:

Reset the concerned control unit with the diagnostic tester before replacing it. In order to do that, call up the "RESET" function from the PROGRAMMING menu of the current system on the diagnostic tester.