Electric Cooling Fan Oldsmobile Only
Purpose
The electric cooling fans are used to lower the temperature of the engine coolant flowing through the radiator. They are also used to cool the refrigerant (R134a) flowing through the A/C condenser.
Operation
The Powertrain Control Module (PCM) controls the operation of the cooling fans. This is accomplished by providing a ground path for the cooling fan relay coils. The relay contacts will close and complete the circuit between the fusible link at the battery junction block and the fan motors.
Power is supplied to the cooling fan motors through a fusible link and three 60 amp maxifuses. The 60 amp maxifuses are located in the underhood electrical center. The PCM Output Driver Module B output 1 is used to control Fan 1 operation. The PCM Output Driver Module B output 2 is used to control Fan 2 operation. The Driver Module outputs are monitored by the PCM. Before using the diagnostics found in this section be sure to perform the Diagnostic Circuit Check found in section 6A. If Diagnostic Trouble Codes P1651 or P1652 are present follow the appropriate diagnostic tables prior to performing diagnostics found in this section.
The PCM will complete the ground path for the Fan 1 relay under the following conditions:
| • | When engine temperature exceeds 100°C (212°F). |
| • | When A/C is requested (ambient temperature must be above 38 °C (100 °F). |
| • | When A/C refrigerant pressure is greater than 190 psi. |
| • | When the ignition is off and engine coolant temperature is greater than 106°C (222°F). |
Fan 2 is used for the increased demand on the cooling system due to A/C. The PCM will complete the ground path for the Fan 2 relay under the following conditions:
| • | When engine temperature exceeds 108°C (226°F). |
| • | When A/C refrigerant pressure is greater than 240 psi. |
When certain Diagnostic Trouble Codes (DTCs) are present, the PCM may command the cooling fans to run all the time. It is important to perform the Diagnostic Circuit check prior to diagnosing the engine cooling fans.
Diagnosis
The following Electric Cooling Fan Diagnostic Table will diagnose the PCM controlled cooling fans.
For specific system description, components and wiring, refer to Cooling Fans in Section 8A or the applicable Electric Cooling Fan diagnostic tables.
Electric Cooling Fan Chevrolet Only
Purpose
The electric cooling fans are used to lower the temperature of the engine coolant flowing through the radiator. They are also used to cool the refrigerant (R134a) flowing through the A/C condenser.
Operation
The Powertrain Control Module (PCM) controls the operation of the cooling fans. This is accomplished by providing a ground path for the cooling fan relay coils within the PCM. The relay contacts will close and complete the circuit between the fusible link at the battery junction block and the fan motors. Whenever there is a fan ON request both fans will be running.
Power for the fan motors is supplied through a fusible link at the battery junction block. Battery feed is applied to the cooling fan relay contacts and coils. The cooling fan relays are energized when current flows through the relay coils to ground at the PCM. The cooling fan relay #1 control circuit is used for low speed cooling fan operation. The cooling fan relay #1 control circuit and the cooling fan relay #2 and #3 control circuit are both grounded for high speed fan operation. The cooling fan relay control circuits are monitored by the PCM. Before using the Electric Cooling Fans diagnostic tables be sure to perform the Powertrain On-Board Diagnostic System Check. If diagnostic trouble codes P1651 or P1652 are present, use the appropriate DTC diagnostic tables prior to performing Electric Cooling Fans diagnostics.
The PCM will complete the ground path for low speed cooling fan relay under any of the following conditions:
| • | When engine coolant temperature exceeds 105°C (221°F). |
| • | When A/C is requested and ambient temperature is above 9°C (48°F). |
| • | When A/C refrigerant pressure is greater than 190 psi (2 volts). |
| • | When the ignition is off and engine coolant temperature is greater than 140°C (140°F). |
The PCM will complete the ground paths for all engine three cooling fan relays under any of the following conditions:
| • | When engine coolant temperature exceeds 113°C (235°F). |
| • | When A/C refrigerant pressure is greater than 275 psi (2.9 volts). |
Important: When certain Diagnostic Trouble Codes (DTCs) are present, the PCM may command the cooling fans to run all the time. It is important to perform the Powertrain On-Board Diagnostic System check prior to diagnosing the engine cooling fans.
Diagnosis
If a problem that involves the low speed cooling fan relay control circuit (cooling fan relay #1 control) exists, DTC P1651 should set. If the problem affects the high speed cooling fan relay control circuit (cooling fan relay #2 and #3 control), DTC P1652 should set. A problem with the ECT sensor should set DTC P0117, P0118, P1114, or P1115. Any of these DTCs will affect cooling fan operation and should be diagnosed before using the Electric Cooling Fan Diagnosis table. The Electric Cooling Fan Diagnosis table should be used to diagnose the PCM controlled cooling fans only if no DTC is set.
