Vauxhall Workshop Service and Repair Manuals

Test

Work Order Description

Nominal Value

Check: Interruption of Voltage Supply Circuit

• Ignition OFF
• Remove electrical component from socket:
  K2_X125 Relay - Engine Control Unit
• Measure voltage between the following terminals:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 30, 86
  &
  Ground

greater than 11 V

Check: Short to Voltage of Signal Circuit

• Measure voltage between the following terminals:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 85
  &
  Ground

less than 0.3 V

Check: Short to Ground of Signal Circuit

• Measure voltage between the following terminals:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 86
  &
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 85

less than 0.3 V

Check: Interruption of Signal Circuit

• Disconnect wiring harness connector from:
  A84 Control Unit - Engine
• Measure resistance between the following terminals:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 85
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 80 (XC20)

less than 5 Ohm

Check: Short to Voltage of Voltage Supply Circuit

• Remove fused jumper wire
• Measure voltage between the following terminals:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 4, 5, 6 (XC20)
  &
  Ground

less than 0.3 V

Check: Interruption of Voltage Supply Circuit

• Connect fused jumper wire to:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 30
  &
  Socket Terminal 87
• Measure voltage between the following terminals:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 4, 5, 6 (XC20)
  &
  Ground

greater than 11 V

Check: Component

• Disconnect wiring harness connector from:
  A84 Control Unit - Engine
• Measure voltage between the following terminals:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 86
  &
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 85

less than 0.3 V

Check: Short to Voltage of Signal Circuit

• Disconnect wiring harness connector from:
  A84 Control Unit - Engine
• Measure voltage between the following terminals:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 85
  &
  Ground

less than 0.3 V

Result

Cause Of Fault

• Defective component:
  K2_X125 Relay - Engine Control Unit

• Circuit interruption between:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 4, 5, 6, (XC20)
  &
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 28 (XE3)

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.

• Short circuit to voltage between:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 4, 5, 6 (XC20)

&

or

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.

• Circuit interruption between:
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 16 (XE3)
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 80 (XC20)

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.

• 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.

• Short circuit to ground between:
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 16 (XE3)
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 80 (XC20)

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.

• Short circuit to voltage between:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 80 (XC20)
  &
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 16 (XE3)

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.

• 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.