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:
  B56 Sensor - Oxygen, Exhaust, Heated
• Remove electrical component from socket:
  K2_X125 Relay - Engine Control Unit
• Connect fused jumper wire to:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 87
  &
  Battery voltage
• Measure voltage between:
  B56 Sensor - Oxygen, Exhaust, Heated
  Wiring harness connector (wiring harness side) terminal 4
  &
  Ground

greater than 11 V

Check: Short to Voltage of Ground Circuit

• Remove fused jumper wire
• Disconnect wiring harness connector from:
  A84 Control Unit - Engine
  (Wiring Harness Connector XC53 )
• Ignition ON
• Measure voltage between:
  B56 Sensor - Oxygen, Exhaust, Heated
  Wiring harness connector (wiring harness side) terminal 3
  &
  Ground

less than 0.3 V

Check: Short to Ground of Signal Circuit

• Ignition OFF
• Measure resistance between:
  B56 Sensor - Oxygen, Exhaust, Heated
  Wiring harness connector (wiring harness side) terminal 3
  &
  Ground

greater than 500 kOhm

Check: Circuit Interruption of Ground Circuit

• Measure resistance between the following terminals:
  B56 Sensor - Oxygen, Exhaust, Heated
  Wiring harness connector (wiring harness side) terminal 3
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 51 (XC53)

less than 5 Ohm

Check: Component

• Measure resistance between the following terminals:
  B56 Sensor - Oxygen, Exhaust, Heated
  Wiring harness connector (component side) terminal 4
  &
  B56 Sensor - Oxygen, Exhaust, Heated
  Wiring harness connector (component side) terminal 3

1 ... 20 Ohm

Result

Cause Of Fault

• Defective component:
  A84 Control Unit - Engine

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.

• Defective component:
  B56 Sensor - Oxygen, Exhaust, Heated

Important:

After replacing the following component the programming function for the replacement of the corresponding component has to be performed by using the diagnostic tester:

B56 Sensor - Oxygen, Exhaust, Heated

• Circuit interruption between:
  B56 Sensor - Oxygen, Exhaust, Heated
  Wiring harness connector (wiring harness side) terminal 3
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 51 (XC53)

• Short circuit to ground between:
  B56 Sensor - Oxygen, Exhaust, Heated
  Wiring harness connector (wiring harness side) terminal 3
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 51 (XC53)

• Short circuit to voltage between:
  B56 Sensor - Oxygen, Exhaust, Heated
  Wiring harness connector (wiring harness side) terminal 3
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 51 (XC53)

• Circuit interruption between:
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 28 (XE3)
  &
  B56 Sensor - Oxygen, Exhaust, Heated
  Wiring harness connector (wiring harness side) terminal 4

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.