DEFINITION: One or both engine cooling fan motors do not operate properly in high or low speed modes.

Did you perform the Engine Cooling Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Engine Cooling

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, command the Low Speed Fan Relay ON and OFF.

Do the low speed engine cooling fans turn ON and OFF with each command?

Go to Step 3

Go to Step 4

Important:: The cooling fans will remain in low speed operation for 3 seconds before the PCM grounds the high speed fan relay control to turn on the high speed fans.

With a scan tool, command the S/P High Speed Fan Relay ON and OFF.

Do the high speed engine cooling fans turn ON and OFF with each command?

Go to in Testing for Intermittent Conditions and Poor Connections Wiring Systems

Go to Step 11

1. Remove the Cool Fan 2 relay.
2. Connect a 20 A fused jumper between the battery positive voltage circuit of the Cool Fan 2 relay and the cooling fan motor supply voltage circuit of the Cool Fan 2 relay.

Do both cooling fans operate in low speed?

Go to Step 13

Go to Step 5

1. Leave the fused jumper wire in place of the Cool Fan 2 relay.
2. Remove the Cool Fan S/P relay
3. Connect a 20 A fused jumper between the RH cooling fan low circuit of the Cool Fan S/P relay and the LH cooling fan motor supply voltage circuit of the Cool Fan S/P relay.

Do both cooling fans operate in low speed?

Go to Step 14

Go to Step 6

1. Leave the fused jumper wire in place of the Cool Fan 2 relay.
2. Connect a 20 A fused jumper between the battery positive voltage circuit of the Cool Fan S/P relay and the cooling fan motor supply voltage circuit of the Cool Fan S/P relay.

Does the LH cooling fan motor operate in high speed?

Go to Step 9

Go to Step 7

1. Leave the fused jumper wire in place of the Cool Fan 2 relay.
2. Install the Cool Fan S/P relay.
3. Disconnect the LH cooling fan motor electrical connector.
4. Connect a 20 Amp fused jumper wire from the cooling fan motor supply voltage circuit of the LH cooling fan motor electrical connector to the cooling fan motor ground circuit of the LH cooling fan motor electrical connector.

Does the RH cooling fan motor operate in high speed?

Go to Step 16

Go to Step 8

1. Leave the fused jumper wire in place of the Cool Fan 2 relay.
2. Connect a 20 Amp fused jumper wire from the cooling fan motor supply voltage circuit of the LH cooling fan motor electrical connector to a good ground.

Does the RH cooling fan motor operate in high speed?

Go to Step 20

Go to Step 21

1. Leave the fused jumper wire in the Cool Fan 2 relay.
2. Install the Cool Fan S/P relay.
3. Disconnect the RH cooling fan motor electrical connector.
4. Connect a 20 Amp fused jumper wire from battery positive voltage circuit of the RH cooling fan motor electrical connector to the cooling fan motor ground circuit of the RH cooling fan motor electrical connector.

Does the LH cooling fan motor operate in high speed?

Go to Step 17

Go to Step 10

1. Leave the fused jumper wire in place of the Cool Fan 2 relay.
2. Connect a 20 Amp fused jumper wire from battery positive voltage to the RH cooling fan motor low circuit of the of the RH cooling fan motor electrical connector.

Does the LH cooling fan motor operate in high speed?

Go to Step 18

Go to Step 22

Is the LH cooling fan motor operating properly in high speed?

Go to Step 12

Go to Step 15

1. Remove the Cool Fan S/P relay
2. Connect a 20 A fused jumper between the RH cooling fan low circuit of the Cool Fan S/P relay and the ground circuit of the Cool Fan S/P relay.

Does the RH cooling fan operate properly in high speed?

Go to Step 14

Go to Step 19

Inspect for poor connections at the Cool Fan 2 relay. Refer to and in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 23

Inspect for poor connections at the Cool Fan S/P relay. Refer to and in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 24

Inspect for poor connections at the Cool Fan 1 relay. Refer to and in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 25

Inspect for poor connections at the harness connector of the LH cooling fan motor. Refer to and in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 26

Inspect for poor connections at the harness connector of the RH cooling fan motor. Refer to and in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 27

Repair the RH cooling fan motor supply voltage circuit. Refer to in Wiring Systems.

Did you complete the repair?

Go to Step 28

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Repair the RH cooling fan motor ground circuit. Refer to in Wiring Systems.

Did you complete the repair?

Go to Step 28

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Repair the LH cooling fan motor ground circuit. Refer to in Wiring Systems.

Did you complete the repair?

Go to Step 28

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Repair the LH cooling fan motor supply voltage circuit. Refer to in Wiring Systems.

Did you complete the repair?

Go to Step 28

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Repair the RH cooling fan motor low circuit. Refer to in Wiring Systems.

Did you complete the repair?

Go to Step 28

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Replace the Cool Fan 2 relay.

Is the repair complete?

Go to Step 28

--

Replace the Cool Fan S/P relay.

Is the repair complete?

Go to Step 28

--

Replace the Cool Fan 1 relay.

Is the repair complete?

Go to Step 28

--

Replace the LH cooling fan motor. Refer to .

Is the repair complete?

Go to Step 28

--

Replace the RH cooling fan motor. Refer to .

Is the repair complete?

Go to Step 28

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3