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
• Disconnect wiring harness connector from:
  Y123 Solenoid Valve - Tank Ventilation
  Connect fused jumper wire to:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 87
  &
  Battery voltage
• Measure voltage between the following terminals:
  Y123 Solenoid Valve - Tank Ventilation
  Wiring harness connector (wiring harness side) terminal 1
  &
  Ground

greater than 11 V

Check: Short to Voltage of Voltage Supply Circuit

• Disconnect wiring harness connector from:
  M3 Motor - Radiator Fan
  and
  A84 Control Unit - Engine
  (Wiring Harness Connector (XC1) )
• Ignition ON
• Measure voltage between the following terminals:
  Y123 Solenoid Valve - Tank Ventilation
  Wiring harness connector (wiring harness side) terminal 2
  &
  Ground

less than 0.3 V

Check: Component

• Ignition OFF
• Connect wiring harness connector to:
  Y123 Solenoid Valve - Tank Ventilation
• Ground the following terminal briefly several times:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 33 (XC1)

Clicking noise from following component:

Y123 Solenoid Valve - Tank Ventilation

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.

• Short circuit to ground/interruption of circuit between:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 33 (XC1)
  &
  Y123 Solenoid Valve - Tank Ventilation
  Wiring harness connector (wiring harness side) terminal 2

or

• Defective component:
  Y123 Solenoid Valve - Tank Ventilation

• Short circuit to voltage between:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 33 (XC1)
  &
  Y123 Solenoid Valve - Tank Ventilation
  Wiring harness connector (wiring harness side) terminal 2

• Circuit interruption between:
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 29 (XE3)
  &
  Y123 Solenoid Valve - Tank Ventilation
  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.