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Engine Cooling System: Overview Pontiac Bonneville X

Cooling System (Mechanical) 6 illustrations ~346 words

Test Description

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

Scheme 30

Scheme 30: Test Description
Scheme 30: Test Description
  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. Determine if the Instrument Cluster or Powertrain Control Modules have set DTC's which may affect Engine Cooling operation are present.
  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 31

Scheme 31: Scan Tool Output Controls
Scheme 31: Scan Tool Output Controls

Scheme 32

Scheme 32: Scan Tool Data List
Scheme 32: Scan Tool Data List

Scheme 33

Scheme 33
Scheme 33

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

Scheme 34

Scheme 34: Test Description
Scheme 34: Test Description
  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.

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

Scheme 35

Scheme 35: Test Description
Scheme 35: Test Description
  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.

Symptoms - Engine Cooling

Important: Review the system operation in order to familiarize yourself with the system function. Refer to COOLING SYSTEM DESCRIPTION & OPERATION .

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