Vauxhall Workshop Service and Repair Manuals

Test

Work Order Description

Nominal Value

Check: Short to Voltage of Signal Circuit

• Ignition OFF
• Disconnect wiring harness connector from:
  A112 Control Unit - Transmission
  (Wiring Harness Connector XC61 )
• Ignition ON
• Measure voltage between the following terminals:
  A112 Control Unit - Transmission
  Wiring harness connector (wiring harness side) terminal 7 (XC61)
  &
  Ground

less than 0.3 V

Check: Short to Ground of Signal Circuit

• Ignition OFF
• Measure resistance between the following terminals:
  A112 Control Unit - Transmission
  Wiring harness connector (wiring harness side) terminal 7 (XC61)
  &
  Ground

greater than 500 kOhm

Check: Interruption of Signal Circuit

• Measure resistance between the following terminals:
  A112 Control Unit - Transmission
  Wiring harness connector (wiring harness side) terminal 7 (XC61)
  &
  A112 Control Unit - Transmission
  Wiring harness connector (wiring harness side) terminal 8 (XC61)

Note:

Automatic transmission oil temperature between 10 °C (50 °F) and 145 °C (293 °F)

Temperature 10 °C (50 °F) : 5855 ... 6820 Ohm

Temperature 110 °C (230 °F) : 237 ... 252 Ohm

Temperature 145 °C (293 °F) : 112 ... 122 Ohm

110 ... 6820 Ohm

Check: Interruption of Signal Circuit

• Measure resistance between the following terminals:
  A112 Control Unit - Transmission
  Wiring harness connector (wiring harness side) terminal 7 (XC61)
  &
  A112 Control Unit - Transmission
  Wiring harness connector (wiring harness side) terminal 8 (XC61)

Note:

Automatic transmission oil temperature between 10 °C (50 °F) and 145 °C (293 °F)

Temperature 10 °C (50 °F) : 5855 ... 6820 Ohm

Temperature 110 °C (230 °F) : 237 ... 252 Ohm

Temperature 145 °C (293 °F) : 112 ... 122 Ohm

greater than 6820 Ohm

Result

Cause Of Fault

• Defective component:
  A112 Control Unit - Transmission

Note:

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:
  A112 Control Unit - Transmission
  Wiring harness connector (wiring harness side) terminal 7 (XC61)
  &
  B3_X121 Sensor - Temperature, Transmission Oil
  or
  A112 Control Unit - Transmission
  Wiring harness connector (wiring harness side) terminal 8 (XC61)
  &
  B3_X121 Sensor - Temperature, Transmission Oil

or

• Defective component:
  B3_X121 Sensor - Temperature, Transmission Oil

• Short circuit in wiring harness between:
  A112 Control Unit - Transmission
  Wiring harness connector (wiring harness side) terminal 7 (XC61)
  &
  A112 Control Unit - Transmission
  Wiring harness connector (wiring harness side) terminal 8 (XC61)

or

• Defective component:
  B3_X121 Sensor - Temperature, Transmission Oil

• Short circuit to ground between:
  A112 Control Unit - Transmission
  Wiring harness connector (wiring harness side) terminal 7 (XC61)
  &
  B3_X121 Sensor - Temperature, Transmission Oil
  or
  A112 Control Unit - Transmission
  Wiring harness connector (wiring harness side) terminal 8 (XC61)
  &
  B3_X121 Sensor - Temperature, Transmission Oil

or

• Defective component:
  B3_X121 Sensor - Temperature, Transmission Oil

• Short circuit to voltage between:
  A112 Control Unit - Transmission
  Wiring harness connector (wiring harness side) terminal 7 (XC61)
  &
  B3_X121 Sensor - Temperature, Transmission Oil
  or
  A112 Control Unit - Transmission
  Wiring harness connector (wiring harness side) terminal 8 (XC61)
  &
  B3_X121 Sensor - Temperature, Transmission Oil

or

• Defective component:
  B3_X121 Sensor - Temperature, Transmission Oil