Vauxhall Workshop Service and Repair Manuals

Test

Work Order Description

Nominal Value

Check: Short to Voltage of Signal Circuit

• Ignition OFF
• Remove electrical component from socket:
  K2_X125 Relay - Engine Control Unit
• Ignition ON
• Measure voltage between the following terminals:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 85
  &
  Ground

less than 0.3 V

Check: Short to Voltage of Voltage Supply Circuit

• Measure voltage between the following terminals:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 87
  &
  Ground

less than 0.3 V

Check: Short to Ground of Signal Circuit

• Ignition OFF
• Disconnect wiring harness connector from:
  A84 Control Unit - Engine
  (Wiring Harness Connector XC53 )
• Measure resistance between the following terminals:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 85
  &
  Ground

greater than 500 kOhm

Check: Interruption of Signal Circuit

• 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 72 (XC53)

less than 5 Ohm

Check: Short to Ground of Voltage Supply Circuit

• Ignition OFF
• Remove electrical component from socket:
  FE21 Fuse
• Ignition ON
• Measure voltage between:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 87
  &
  Ground

less than 0.3 V

Check: Short to Voltage of Signal Circuit

• Ignition OFF
• Remove electrical component from socket:
  FE26 Fuse
• Ignition ON
• Measure voltage between the following terminals:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 87
  &
  Ground

less than 0.3 V

Check: Vehicle Configuration

Is the following information correct for the actual vehicle?

Check: Short to Voltage of Voltage Supply Circuit

• Ignition OFF
• Disconnect wiring harness connector from:
  Y56 Solenoid Valve - Exhaust Gas Recirculation
• Ignition ON
• Measure voltage between the following terminals:
  FE26 Fuse
  Output contact
  &
  Ground
• Disconnect each of the following components/control units consecutively from the wiring harness and repeat the measurement each time:
  A111 Throttle Valve - Positioner
  B87 Sensor - Water Level, Fuel Filter
  Y142 Solenoid Valve - Boost Pressure Regulation
  Y145 Solenoid Valve - Swirl

less than 0.3 V

Check: Vehicle Configuration

Is the following information correct for the actual vehicle?

Check: Short to Voltage of Signal Circuit

• Ignition OFF
• Disconnect wiring harness connector from:
  B56 Sensor - Oxygen, Exhaust, Heated
• Ignition ON
• Measure voltage between the following terminals:
  FE26 Fuse
  Output contact
  &
  Ground

less than 0.3 V

Check: Short to Voltage of Voltage Supply Circuit

• Ignition OFF
• Disconnect wiring harness connector from:
  Y56 Solenoid Valve - Exhaust Gas Recirculation
• Ignition ON
• Measure voltage between the following terminals:
  FE26 Fuse
  Output contact
  &
  Ground
• Disconnect each of the following components/control units consecutively from the wiring harness and repeat the measurement each time:
  A111 Throttle Valve - Positioner
  B87 Sensor - Water Level, Fuel Filter
  Y142 Solenoid Valve - Boost Pressure Regulation

less than 0.3 V

Check: Short to Voltage of Voltage Supply Circuit

• Ignition OFF
• Remove electrical component from socket:
  FE32 Fuse
• Ignition ON
• Measure voltage between the following terminals:
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 87
  &
  Ground

less than 0.3 V

Check: Short to Voltage of Signal Circuit

• Ignition OFF
• Disconnect wiring harness connector from:
  S218 Switch - Stop Lamp, Double
• Ignition ON
• Measure voltage between the following terminals:
  FE32 Fuse
  Output contact
  &
  Ground

less than 0.3 V

Check: Vehicle Configuration

Is the following information correct for the actual vehicle?

Check: Short to Voltage of Signal Circuit

• Ignition OFF
• Remove electrical component from socket:
  K8_X125 Relay - Compressor, Air Conditioning
• Ignition ON
• Measure voltage between the following terminals:
  FE32 Fuse
  Output contact
  &
  Ground

less than 0.3 V

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.

• 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 72 (XC53)

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 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 72 (XC53)

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:
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 28 (XE3)
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 1 (XC53)

or

• 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:
  If the nominal value is reached during one of the measurements, the component/control unit that has been disconnected immediately before that measurement is defective.

• Short circuit to voltage between:
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 29 (XE3)
  &
  Y56 Solenoid Valve - Exhaust Gas Recirculation
  Wiring harness connector (wiring harness side) terminal 5
  &
  Wiring harness connector terminals of all components (wiring harness side), which were disconnected from the wiring harness during this troubleshooting session

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 51 (XC53)
  &
  B56 Sensor - Oxygen, Exhaust, Heated
  Wiring harness connector (wiring harness side) terminal 3

or

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

• Defective component:
  S218 Switch - Stop Lamp, Double

Note:

If the defective component is a switching device (e.g. switch or relay) or a fuse, the cause for the fault may be located in the circuit behind that component.
In case of a switching device, the corresponding part of the circuit should be checked for short to ground/voltage before replacing the component.

• Defective component:
  K8_X125 Relay - Compressor, Air Conditioning

Note:

If the defective component is a switching device (e.g. switch or relay) or a fuse, the cause for the fault may be located in the circuit behind that component.
In case of a switching device, the corresponding part of the circuit should be checked for short to ground/voltage before replacing the component.

• Short circuit to voltage between:
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 60 (XE2)
  &
  S218 Switch - Stop Lamp, Double
  Wiring harness connector (wiring harness side) terminal 3

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:
  S218 Switch - Stop Lamp, Double
  Wiring harness connector (wiring harness side) terminal 3
  &
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 60 (XE2)

• 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:
  X125 Underhood Electronic Module
  Socket Terminal 16 (XE3)
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 72 (XC53)

or

• Defective component:
  X125 Underhood Electronic Module
  or
  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.

Note:

The replacement of the components must be done in the listed order.

The system must be checked for proper operation after every replacement.