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Engine Cooling System: Overview Oldsmobile Aurora II

Cooling Fan 11 illustrations ~524 words

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. 2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
  2. 3. The symptom list in Symptoms will determine the correct diagnostic procedure to use.
  3. 4. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.

Scheme 52

Scheme 52
Scheme 52

Scheme 53

Scheme 53: Scan Tool Output Controls
Scheme 53: Scan Tool Output Controls

Scheme 54

Scheme 54: Scan Tool Data List
Scheme 54: Scan Tool Data List

Scheme 55

Scheme 55
Scheme 55

Scheme 56

Scheme 56
Scheme 56

The numbers below refer to the step numbers on the diagnostic table.

  1. 2. Listen for an audible click when the cooling fan 1 relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3. Tests for voltage at the coil side of the cooling fan 1 relay. The cool fan 1 fuse supplies battery positive voltage to the coil side of the cooling fan 1 relay.
  3. 4. Verifies that the PCM is providing ground to the cooling fan 1 relay.
  4. 5. Tests if ground is constantly being applied to the cooling fan 1 relay.

Scheme 57

Scheme 57
Scheme 57

Scheme 58

Scheme 58
Scheme 58

The numbers below refer to the step numbers on the diagnostic table.

  1. 2. Listen for an audible click when the cooling fan 1 relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3. Tests for voltage at the coil side of the cooling fan 1 relay. The cool fan 1 fuse supplies battery positive voltage to the coil side of the cooling fan 1 relay.
  3. 4. Verifies that the PCM is providing ground to the cooling fan 1 relay.
  4. 5. Tests if ground is constantly being applied to the cooling fan 1 relay.

Scheme 59

Scheme 59
Scheme 59

Scheme 60

Scheme 60
Scheme 60

The numbers below refer to the step numbers on the diagnostic table.

  1. 2. Listen for an audible click when the cooling fan s/p and the cooling fan 2 relays operate. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3. Tests for voltage at the coil side of the cooling fan 2 relay. The cool fan 2 fuse supplies battery positive voltage to the coil side of the cooling fan 2 relay.
  3. 4. Verifies that the PCM is providing ground to the cooling fan 2 relay.
  4. 5. Tests if ground is constantly being applied to the cooling fan 2 relay.

Scheme 61

Scheme 61
Scheme 61

The numbers below refer to the step numbers on the diagnostic table.

  1. 2. Listen for an audible click when the cooling fan s/p and the cooling fan 2 relays operate. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3. Tests for voltage at the coil side of the cooling fan 2 relay. The cool fan 2 fuse supplies battery positive voltage to the coil side of the cooling fan 2 relay.
  3. 4. Verifies that the PCM is providing ground to the cooling fan 2 relay.
  4. 5. Tests if ground is constantly being applied to the cooling fan 2 relay.

Scheme 62

Scheme 62
Scheme 62

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