Vauxhall Workshop Service and Repair Manuals

Test

Work Order Description

Nominal Value

Check: Diagnostic Trouble Code stored

Is the following Diagnostic Trouble Code stored?

P0597

Coolant Thermostat Valve Stuck

Check: Mechanical Functionality

• Check the following system for proper operation:
  Coolant Circuit
• Check the following system / signal for proper operation:
  B39A Sensor - Temperature, Coolant

Note:

Check the radiator for contamination and damage

Test okay?

Check: Interruption of Voltage Supply Circuit

• Ignition OFF
• Disconnect wiring harness connector from:
  Y158 Thermostat, Map-Controlled
• Ignition ON
• Measure voltage between the following terminals:
  Y158 Thermostat, Map-Controlled
  Wiring harness connector (wiring harness side) terminal 2
  &
  Ground

greater than 11 V

Check: Short to Voltage of Voltage Supply Circuit

• Ignition OFF
• Disconnect wiring harness connector from:
  A84 Control Unit - Engine
• Ignition ON
• Measure voltage between the following terminals:
  Wiring harness connector (wiring harness side) terminal 1
  Y158 Thermostat, Map-Controlled
  &
  Ground

less than 0.3 V

Check: Short to Ground/Interruption of Signal Circuit

• Ignition OFF
• Measure resistance between the following terminals:
  Y158 Thermostat, Map-Controlled
  Wiring harness connector (wiring harness side) terminal 1
  &
  Ground

greater than 500 kOhm

Check: Interruption of Signal Circuit

• Measure resistance between the following terminals:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 4 (XC3)
  &
  Y158 Thermostat, Map-Controlled
  Wiring harness connector (wiring harness side) terminal 1

less than 5 Ohm

Check: Component

• Measure resistance between the following terminals:
  Y158 Thermostat, Map-Controlled
  Wiring harness connector (component side) terminal 1
  &
  Y158 Thermostat, Map-Controlled
  Wiring harness connector (component side) terminal 2

10 ... 20 Ohm

Result

Cause Of Fault

• Defective component:
  Y158 Thermostat, Map-Controlled

Important:

If shavings in the valve were the cause of the fault, the oil duct must be cleaned as far as possible.

Shavings inside the oil duct may cause the trouble code to be set again.

• Defective component:
  Y158 Thermostat, Map-Controlled
  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.

• Defective component:
  Y158 Thermostat, Map-Controlled

• Circuit interruption between:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 4 (XC3)
  &
  Y158 Thermostat, Map-Controlled
  Wiring harness connector (wiring harness side) terminal 1

• Short circuit to ground between:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 4 (XC3)
  &
  Y158 Thermostat, Map-Controlled
  Wiring harness connector (wiring harness side) terminal 1

• Short circuit to voltage between:
  A84 Control Unit - Engine
  Wiring harness connector (wiring harness side) terminal 4 (XC3)
  &
  Y158 Thermostat, Map-Controlled
  Wiring harness connector (wiring harness side) terminal 1

• Circuit interruption between:
  X125 Underhood Electronic Module
  Wiring harness connector (wiring harness side) terminal 29 (XE3)
  &
  Y158 Thermostat, Map-Controlled
  Wiring harness connector (wiring harness side) terminal 2

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.

• Repair or replace defective component