Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 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.
- 3. Determine if the instrument cluster or powertrain control modules (PCMs) have set DTCs which may affect engine cooling operation are present.
- 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.
- 5. If DTC P1484 or P0495 is set along with DTC P0113 and the weather conditions are cold, the cooling fan codes may be false.
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The numbers below refer to the step numbers on the diagnostic table.
- 2. This step ensures that the DTC has failed this ignition cycle. If the scan tool displays Passed, then the answer is No.
- 3. The cooling fan noise should increase as the cooling fan clutch engages. It can take up to 2 minutes for full cooling fan clutch engagement. If cooling fan clutch is previously fully engaged, then there will not be a Noticeable change in cooling fan noise. Compare noise to a known good vehicle. If fan noise is louder than the known good vehicle, then answer Yes.
- 4. In the previous step the cooling fan clutch was fully engaged. This step tests to ensure that the cooling fan clutch will disengage. A Noticeable noise difference should be heard between a fully engaged cooling fan clutch and a disengaged cooling fan clutch. The cooling fan clutch is completely disengaged when the excessive fan noise is not heard.
- 5. Tests for the ability of the PCM to control fan speed. If answer to question is Yes, ensure to refer to all Diagnostic Aids.
- 6. Verifies the ignition 1 voltage circuit of the cooling fan relay.
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The numbers below refer to the step numbers on the diagnostic table.
- 2. This step ensures that the DTC has failed this ignition cycle. If the scan tool displays Passed, then the answer is No.
- 3. The cooling fan noise should increase as the cooling fan clutch engages. It can take up to 2 minutes for full cooling fan clutch engagement. If cooling fan clutch is previously fully engaged, then there will not be a Noticeable change in cooling fan noise. Compare noise to a known good vehicle. If fan noise is louder than the known good vehicle, then answer Yes.
- 4. In the previous step the cooling fan clutch was fully engaged. This step tests to ensure that the cooling fan clutch will disengage. A Noticeable noise difference should be heard between a fully engaged cooling fan clutch and a disengaged cooling fan. The cooling fan clutch is completely disengaged when the excessive fan noise is not heard.
- 5. Tests the PCM's ability to control the cooling fan clutch. If answer to question is Yes, ensure to refer to all Diagnostic Aids.
- 6. Inspect for a mechanical condition which causes the DTC to set.
- 7. Tests for voltage on the cooling fan clutch supply voltage circuit of the cooling fan clutch. The cooling fan connector is a seal connector. You must use jumper wires for testing or damage to wiring or connector could happen.
- 8. Tests the cooling fan relay for a PWM signal on the cooling fan clutch supply voltage circuit of the cooling fan.
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The numbers below refer to the step numbers on the diagnostic table.
- 2. This step ensures that the DTC has failed this ignition cycle. If the scan tool displays Passed, then the answer is No.
- 3. The cooling fan noise should increase as the cooling fan clutch engages. It can take up to 2 minutes for full cooling fan clutch engagement. If cooling fan clutch is previously fully engaged, then there will not be a Noticeable change in cooling fan noise. Compare noise to a known good vehicle. If fan noise is louder than the known good vehicle, then answer Yes.
- 4. In the previous step the cooling fan clutch was fully engaged. This step tests to ensure that the cooling fan clutch will disengage. A Noticeable noise difference should be heard between a fully engaged cooling fan clutch and a disengaged cooling fan clutch. The cooling fan clutch is completely disengaged when the excessive fan noise is not heard.
- 5. Tests the ability of the PCM to control the cooling fan speed. If answer to question is Yes, ensure to refer to all Diagnostic Aids.
- 6. Disconnecting the cooling fan clutch and running the engine ensure that the cooling fan clutch is not engaged. When rotating the cooling fan clutch it should spin freely. If not then the cooling fan clutch will not disengage.
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The numbers below refer to the step numbers on the diagnostic table.
- 2. Tests that the PCM receives a cooling fan speed signal through the cooling fan speed signal circuit. If answer to question is Yes, ensure to refer to all Diagnostic Aids.
- 3. Tests for the proper operation of the cooling fan clutch hall effect sensor. The voltage should fluctuate between 0 and 5 volts. If the voltage stays at 0 volts, the signal circuit is shorted to ground.
- 4. Tests for the proper operation of the 5-volt reference circuit and of the low reference circuit of the cooling fan clutch.
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The numbers below refer to the step numbers on the diagnostic table.
- 2. Tests that the PCM receives a cooling fan speed signal through the cooling fan speed signal circuit. If answer to question is Yes, ensure to refer to all Diagnostic Aids.
- 3. Tests for the proper operation of the clutch hall effect sensor.
- 4. Tests for the proper operation of the 5-volt reference circuit and of the low reference circuit of the cooling fan.
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The numbers below refer to the step numbers on the diagnostic table.
- 2. This step ensures that the DTC has failed this ignition cycle. If the scan tool displays Passed, then the answer is No.
- 3. The cooling fan noise should increase as the cooling fan clutch engages. It can take up to 2 minutes for full cooling fan clutch engagement. If cooling fan clutch is previously fully engaged, then there will not be a Noticeable change in cooling fan noise. Compare noise to a known good vehicle. If fan noise is louder than the known good vehicle, then answer Yes.
- 4. In the previous step the cooling fan clutch was fully engaged. This step tests to ensure that the cooling fan clutch will disengage. A Noticeable noise difference should be heard between a fully engaged cooling fan clutch and a disengaged cooling fan clutch. The cooling fan clutch is completely disengaged when the excessive fan noise is not heard.
- 5. Tests for the ability of the PCM to control cooling fan clutch speed. If answer to question is Yes, ensure to refer to all Diagnostic Aids.
- 6. Verifies the ignition 1 voltage circuit of the cooling fan relay.
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The numbers below refer to the step numbers on the diagnostic table.
- 2. This step ensures that the DTC has failed this ignition cycle. If the scan tool displays Passed, then the answer is No.
- 3. The cooling fan noise should increase as the cooling fan clutch engages. It can take up to 2 minutes for full cooling fan clutch engagement. If cooling fan clutch is previously fully engaged, then there will not be a Noticeable change in cooling fan noise. Compare noise to a known good vehicle. If fan noise is louder than the known good vehicle, then answer Yes.
- 4. In the previous step the cooling fan clutch was fully engaged. This step tests to ensure that the cooling fan clutch will disengage. A Noticeable noise difference should be heard between a fully engaged cooling fan clutch and a disengaged cooling fan clutch. The cooling fan clutch is completely disengaged when the excessive fan noise is not heard.
- 5. Tests the PCM's ability to control the cooling fan. If answer to question is Yes, ensure to refer to all Diagnostic Aids.
- 6. Inspect for a mechanical condition which causes the DTC to set.
- 7. Tests for voltage on the cooling fan clutch supply voltage circuit of the cooling fan clutch. The cooling fan clutch connector is a seal connector. You must use jumper wires for testing or damage to wiring or connector could happen.
- 8. Tests the cooling fan relay for a PWM signal on the cooling fan clutch supply voltage circuit of the cooling fan clutch.
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Symptoms - Engine Cooling
| IMPORTANT | Review the system operation in order to familiarize yourself with the system functions. Refer to Cooling System Description and Operation . |
The numbers below refer to the step numbers in the diagnostic table.
- 2. There should be no binding or increased resistance as the cooling fan clutch is rotated.
- 4. The cooling fan noise should increase as the cooling fan clutch engages. It can take up to 2 minutes for full cooling fan clutch engagement. If cooling fan clutch is previously fully engaged, then there will not be a Noticeable change in cooling fan noise. Compare noise to a known good vehicle. If fan noise is louder than the known good vehicle, then answer Yes.
- 5. In the previous step the cooling fan clutch was fully engaged. This step tests to ensure that the cooling fan clutch will disengage. A Noticeable noise difference should be heard between a fully engaged cooling fan clutch and a disengaged cooling fan. The cooling fan clutch is completely disengaged when the excessive fan noise is not heard.
- 6. This step clears DTC that were set during previous steps. Test driving the vehicle will attempt to set DTC not previous found in the Engine Cooling Diagnostic Check. If no DTC is set the condition is normal operation of the cooling fan.
