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Perform electrical check at radiator fan control unit -J293
Electrical check on control unit -J293 (version for High-pressure sender -G65)
 
A87-0273

→ Pin assignment for radiator fan control unit -J293

  • • Fitting location:
    on left longitudinal member in engine compartment
  • • Function:
    • • Switches radiator fans -V7 to 1st and 2nd speed
    • • Actuates AC magnetic clutch -N25.
    • • Processes the square-wave signal of high-pressure sender -G65 and, if the refrigerant circuit pressure is OK, sends a positive signal to -E87.
    • • Switches on pump for coolant supply -V51 (in vehicles with pump for coolant supply -V51) when the ignition is switched on. The pump remains in operation for a brief time after the ignition is switched off.

=> Relevant Workshop Manual, Injection and Ignition system

Notes:

  • ♦ The following contacts in connector -A- to control unit -J293 are vacant:
    • • Contact 1 (in vehicles without pump for coolant supply -V51)
    • • Contacts 3, 5 and 14
    • • Contact 11 (reserved for vehicles with diesel engine).

=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder

  • ♦ The contact 13 in connector -A- is intended to switch off the compressor with the dash panel insert (due to coolant temperature too high). As the switch off is performed simultaneously via the operating and display unit -E87 this contact is not assigned in all vehicles (the assignment is dependent on the design of the vehicle wiring).

=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder

  • ♦ Radiator fan control unit -J293 versions and vehicle wiring differ for vehicles with pressure switch -F129 and high-pressure sender -G65.

=> Parts List

=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder

  • ♦ The control unit -J293, installed in vehicles with high-pressure sender -G65, is available in several designs. Only the design in which the radiator fan is always switched on with the compressor is currently installed in the Audi TT (the first fan speed is switched on independently from the pressure in the refrigerant circuit).
 
A87-0261

→ Pin assignment for high-pressure sender -G65

Contact 1, earth

Contact 2, signal output (square-wave signal to -J293 and to engine control unit)

Contact 3, positive (terminal 15)

Notes:

 
A87-0261
  • ♦ → The compressor will not be switched on if connector -B- is disconnected.
  • ♦ High-pressure sender -A- is an electronic control unit that generates a square-wave signal whose signal ratio changes with the pressure in the refrigerant circuit =>Page 01-157.

Pin assignment at coolant temperature switch -F18 / -F54

Switch -F54 (between contact 1 and 2 closes at approx. 95 °C - the radiator fans are switched to 2nd speed).

Switch -F18 (between contact 3 and 2 closes at approx. 102 °C - the radiator fans are switched to 2nd speed).

Test step 1 (voltage supply)

Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)

Test step

Contact at connector to -J293

Testing of

· Test conditions
- Additional operations

Specification

Remedies if specified value not attained

1.1

Connector B contact 3
and
connector A, contact 6

Voltage supply

- Approx. battery voltage

- Use current flow diagram to repair power supply and/or earth connection

1.2

Connector B contact 1
and
connector A, contact 6

Voltage supply

- Approx. battery voltage

- Use current flow diagram to repair power supply.

Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)

Test step

Contact at connector to -J293

Testing of

· Test conditions
- Additional operations

Specification

Remedies if specified value not attained

1.3

Connector A contact 4
and
connector A, contact 6

Voltage supply

- Approx. battery voltage

- Use current flow diagram to repair power supply.

1.4

Connector A contact 9
and
connector A, contact 6

Voltage supply

· Ignition on.

- Approx. battery voltage

- Use current flow diagram to repair power supply.

Test step 2 (actuation of radiator fan)

Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)

Test step

Contact at connector to -J293

Testing of

· Test conditions
- Additional operations

Specification

Remedies if specified value not attained

2.1

Connector B contact 2
and
connector A, contact 6

"Fan ON" signal (1st speed) from temperature switch -F54.

· Connector detached from temperature switch -F18/-F54, and contacts 1 and 2 jumpered
· Ignition on.

- Approx. battery voltage
Radiator fan running at speed 1

- Use current flow diagram to rectify voltage supply to temperature switch -F54.
Use current flow diagram to locate and eliminate open circuit in the wiring between temperature switch -F54 and control unit -J293.
Use current flow diagram to locate and eliminate open circuit in the wiring to fans -V7.
Service radiator fan -V7.

Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)

Test step

Contact at connector to -J293

Testing of

· Test conditions
- Additional operations

Specification

Remedies if specified value not attained

2.2

Connector A contact 7
and
connector A, contact 6

"Fan ON" signal (2nd speed) from temperature switch -F18.

· Connector detached from temperature switch -F18/-F54, and contacts 2 and 3 jumpered
· Ignition on.

- Approx. battery voltage

- Use current flow diagram to rectify voltage supply to temperature switch -F18.
Use current flow diagram to locate and eliminate open circuit in the wiring between temperature switch -F18 and control unit -J293.

Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)

Test step

Contact at connector to -J293

Testing of

· Test conditions
- Additional operations

Specification

Remedies if specified value not attained

2.3

Connector A
and
connector B attached to -J293

"Fan ON" signal (2nd speed) from temperature switch -F18.

· Connector detached from temperature switch -F18/-F54, and contacts 2 and 3 jumpered
· Ignition on.

- Radiator fan running at speed 2

- Use current flow diagram to locate and eliminate open circuit in the wiring to fans -V7.
Service radiator fan -V7.
Control unit -J293 defective - replace.

Test step 3 (actuation of magnetic clutch)

Select measuring range on hand-held multimeter V.A.G 1526:
Current measurement (20 A=)

Test step

Contact at connector to -J293

Testing of

· Test conditions
- Additional operations

Specification

Remedies if specified value not attained

3.1

Connector A contact 4
and
connector A, contact 10

Actuation of air conditioner magnetic clutch -N25

· Ignition on.

- Less than 10 A
Magnetic clutch clicks (when applying voltage)

- Use current flow diagram to locate and eliminate open circuit or short to earth in the wiring between control unit -J293 and magnetic clutch -N25.
Open circuit in the earth connection to magnetic clutch -N25
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
Magnetic clutch defective - rectify.

Select measuring range on hand-held multimeter V.A.G 1526:
Current measurement (20 A=)

Test step

Contact at connector to -J293

Testing of

· Test conditions
- Additional operations

Specification

Remedies if specified value not attained

3.2

Connector A contact 4
and
connector A, contact 12

Signal for "Refrigerant circuit pressure OK" to -E87

· Engine running
· Fault reader V.A.G 1551 connected and "Measured value block" function selected.

- Less than 1 A
"0" is displayed in the measured value block (display group 001, display zone 1)

- Use current flow diagram to locate and eliminate open circuit or short to positive or earth in the wiring between control unit -J293 and -E87.
Eliminate cause of compressor shutoff condition

Select measuring range on hand-held multimeter V.A.G 1526:
Current measurement (20 A=)

Test step

Contact at connector to -J293

Testing of

· Test conditions
- Additional operations

Specification

Remedies if specified value not attained

3.3

Connector A contact 6
and
connector A, contact 12

Signal for "Refrigerant circuit pressure NOK" to -E87

· Engine running
· Fault reader V.A.G 1551 connected and "Measured value block" function selected.

- Less than 1 A
"1" is displayed in the measured value block (display group 001, display zone 1)

- Use current flow diagram to locate and eliminate open circuit or short to positive in the wiring between control unit -J293 and -E87.

3.4

Connector A contact 4
and
connector A, contact 13

Connection to input for "Coolant temperature too high" recognition

· Ignition on.

- 0 A

- Rectify short circuit to earth in connector A contact 13.

Notes:

  • ♦ The contact 13 in connector -A- is intended to switch off the compressor with the dash panel insert (due to coolant temperature too high). As the switch off is performed simultaneously via the operating and display unit -E87 this contact is not assigned in all vehicles (the assignment is dependent on the design of the vehicle wiring).
  • ♦ If earth is applied to connector -A- contact 13, the radiator fans are actuated and the compressor is not switched on.

Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)
Bridge at connector A between contact 4 and contact 12

Test step

Contact at connector to -J293

Testing of

· Test conditions
- Additional operations

Specification

Remedies if specified value not attained

3.5

Connector A contact 8
and
connector A, contact 6

"Compressor ON" signal from -E87

· Engine running
· Operating and display unit -E87 in "auto" mode (compressor on)

- Approx. battery voltage

- Use current flow diagram to locate and eliminate open circuit or short to positive or earth in the wiring between -J293 and -E87.
Eliminate cause of compressor shutoff condition

Test step 4 (signal from high-pressure sender -G65)

Vehicle diagnosis system VAS 5051 (or commercially available oscilloscope)
"DSO" (digital storage oscilloscope) measurement system
Setting 2V/Div =, 5ms/Div (2 V DC and 5 milliseconds per unit)

Test step

Contact at connector to -J293

Testing of

· Test conditions
- Additional operations

Specification

Remedies if specified value not attained

4

Connector A contact 2 (signal)
and
connector A, contact 6
(earth)

Pressure-dependent square-wave signal from sender -G65

· Ignition on.

- Square-wave signal (dependent on pressure in refrigerant circuit =>Page01-157

- Use current flow diagram to check voltage supply and earth connections to High-pressure sender -G65.
Use current flow diagram to locate and eliminate open circuit in the wiring between High-pressure sender -G65 and control unit -J293.

(Cont.)
▼

Vehicle diagnosis system VAS 5051 (or commercially available oscilloscope)
"DSO" (digital storage oscilloscope) measurement system
Setting 2V/Div =, 5ms/Div (2 V DC and 5 milliseconds per unit)

Test step

Contact at connector to -J293

Testing of

· Test conditions
- Additional operations

Specification

Remedies if specified value not attained

4
(cont.)

- Use circuit flow diagram to locate and rectify short circuit in the wiring from -G65 to -J293 or to the engine control unit.
High-pressure sender -G65 defective - replace.

Notes:

  • ♦ The signal from high-pressure sender -G65 depends on the refrigerant circuit => Page 01-157
  • ♦ The signal generated by high-pressure sender -G65 is also used for engine control (the required compressor drive torque is governed by the refrigerant circuit pressure). Depending on the engine control unit version, the signal in the measured value block is displayed as duty cycle.

=> Relevant Workshop Manual, Injection and Ignition system


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