Vauxhall Workshop Service and Repair Manuals

Test

Work Order Description

Nominal Value

Check: Component

• Connect loaded battery parallel to the battery in the vehicle
• Start engine

Does the engine start?

Check: Wiring Harness

• Ignition OFF
• Remove ignition key from ignition lock
• All consumers turned off
• Charge or replace battery
• Check stall current

Note:

All car systems must be switched OFF during these tests. Doors and trunk / tailgate must be closed, engine compartment lighting must be disconnected.

less than 80 mA

Check: Battery Voltage

• Connect wiring harness connector to:
  G1 Battery
  Terminal 31
• Engine running
• Turn all electrical consumers ON
• Increase engine speed to 3000 rpm
• Measure voltage between the following terminals:
  G1 Battery
  Wiring harness connector (wiring harness side) terminal 30
  &
  G1 Battery
  Wiring harness connector (wiring harness side) terminal 31

greater than 12.5 V

Check: Charging Indicator Lamp Circuit

• Ignition OFF
• Disconnect wiring harness connector from:
  G8 Alternator
  (Wiring Harness Connector D+ )
• Ignition ON
• Measure voltage between the following terminals:
  G8 Alternator
  Wiring harness connector (wiring harness side) terminal D+
  &
  Ground

greater than 11 V

Check: Interruption of Voltage Supply Circuit

• Ignition OFF
• Remove electrical component from socket:
  K1_X125 Relay - Starter
• Measure voltage between the following terminals:
  K1_X125 Relay - Starter
  Socket Terminal 30
  &
  Ground

greater than 11 V

Check: Interruption of Voltage Supply Circuit

• No gear is engaged
• Connect fused jumper wire for a maximum of 3 s to:
  K1_X125 Relay - Starter
  Socket Terminal 30
  &
  K1_X125 Relay - Starter
  Socket Terminal 87

Does the engine start?

Check: Interruption of Signal Circuit

• Ignition ON
• Measure voltage between the following terminals:
  K1_X125 Relay - Starter
  Socket Terminal 86
  &
  Ground

greater than 11 V

Check: Short to Voltage of Signal Circuit

• Ignition OFF
• Remove electrical component from socket:
  X125 Underhood Electronic Module
• Disconnect wiring harness connector from:
  A84 Control Unit - Engine
• Ignition ON
• Measure voltage between the following terminals:
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 1 (XE3)
  &
  Ground

less than 0.3 V

Check: Short to Ground of Signal Circuit

• Ignition OFF
• Measure resistance between the following terminals:
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 1 (XE3)
  &
  Ground

greater than 500 kOhm

Check: Interruption of Signal Circuit

• Measure resistance between the following terminals:
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 1 (XE3)
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 60 (XC100)

less than 5 Ohm

Check: Component

• Insert electrical component in socket:
  X125 Underhood Electronic Module
• Ignition ON
• Contact fused jumper wire once to:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 60 (XC100)
  &
  Ground

Does the engine start?

Check: Interruption of Voltage Supply Circuit

• Measure resistance between the following terminals:
  K1_X125 Relay - Starter
  Socket Terminal 87
  &
  M15 Starter
  Wiring harness connector (wiring harness side) terminal 50

less than 5 Ohm

Result

Cause Of Fault

• Defective component:
  G1 Battery

• High transition resistance between:
  G8 Alternator
  Wiring harness connector (wiring harness side) terminal B+
  &
  G1 Battery
  Wiring harness connector (wiring harness side) terminal 30
  or
  G8 Alternator
  Wiring harness connector (wiring harness side) terminal B-
  &
  Ground

or

• Defective component:
  G8 Alternator

• Short circuit to ground/interruption of circuit between:
  G8 Alternator
  Wiring harness connector (wiring harness side) terminal D+
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 52 (XC100)

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.

• Stall current of one or more consumers is too high

Note:

During fault searching in the wiring harness, the sections of the wiring harness can be separated at the assigned connectors. When the stall current changes to the permissible value after separating a section, the fault is located in the concerning section of the wiring harness.

• 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:
  K1_X125 Relay - Starter
  or
  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.

Note:

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

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

• Circuit interruption between:
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 1 (XE3)
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 60 (XC100)

• Short circuit to ground between:
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 1 (XE3)
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 60 (XC100)

• Short circuit to voltage between:
  X125 Underhood Electronic Module
  Socket Terminal 1 (XE3)
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 60 (XC100)

• 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.

• High transition resistance between:
  M15 Starter
  Wiring harness connector (component side) terminal 30
  &
  G1 Battery
  Wiring harness connector (component side) terminal 30
  or
  M15 Starter
  Wiring harness connector (component side) terminal 31
  &
  Ground

or

• Defective component:
  M15 Starter

• Circuit interruption between:
  X125 Underhood Electronic Module
  Socket Terminal 4 (XE3)
  &
  M15 Starter
  Wiring harness connector (wiring harness side) terminal 50

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.

• Circuit interruption between:
  G1 Battery
  Wiring harness connector (wiring harness side) terminal 30
  &
  FE18 Fuse
  Input contact

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.