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:
  Y154 Solenoid Valve - Fuel Pressure Regulation
• Ignition ON
• Measure voltage between the following terminals:
  Y154 Solenoid Valve - Fuel Pressure Regulation
  Wiring harness connector (wiring harness side) terminal 2
  &
  Ground

greater than 11 V

Check: Short to Voltage of Signal Circuit

• Ignition OFF
• Disconnect wiring harness connector from:
  A84 Control Unit - Engine
  (Wiring Harness Connector XC52 )
• Ignition ON
• Measure voltage between the following terminals:
  Y154 Solenoid Valve - Fuel Pressure Regulation
  Wiring harness connector (wiring harness side) terminal 1
  &
  Ground

less than 0.3 V

Check: Short to Ground of Signal Circuit

• Ignition OFF
• Measure resistance between the following terminals:
  Y154 Solenoid Valve - Fuel Pressure Regulation
  Wiring harness connector (wiring harness side) terminal 1
  &
  Ground

greater than 500 kOhm

Check: Interruption of Signal Circuit

• Measure resistance between the following terminals:
  Y154 Solenoid Valve - Fuel Pressure Regulation
  Wiring harness connector (wiring harness side) terminal 1
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 34 (XC52)

less than 5 Ohm

Check: Interruption of Voltage Supply Circuit

• Ignition OFF
• Disconnect wiring harness connector from:
  A84 Control Unit - Engine
  (Wiring Harness Connector XC53 )
• 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
  &
  K2_X125 Relay - Engine Control Unit
  Socket Terminal 30
• Measure voltage between the following terminals:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 1 (XC53)
  &
  Ground

greater than 11 V

Result

Cause Of Fault

• Defective component:
  Y154 Solenoid Valve - Fuel Pressure Regulation
  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.

• Circuit interruption between:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 34 (XC52)
  &
  Y154 Solenoid Valve - Fuel Pressure Regulation
  Wiring harness connector (wiring harness side) terminal 1

• Short circuit to ground between:
  Y154 Solenoid Valve - Fuel Pressure Regulation
  Wiring harness connector (wiring harness side) terminal 1
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 34 (XC52)

• Short circuit to voltage between:
  Y154 Solenoid Valve - Fuel Pressure Regulation
  Wiring harness connector (wiring harness side) terminal 1
  &
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 34 (XC52)

• Circuit interruption between:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 4 (XC52)
  &
  Y154 Solenoid Valve - Fuel Pressure Regulation
  Wiring harness connector (wiring harness side) terminal 2

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.

• Circuit interruption 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)