Cooling Fan Inoperative L61
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views DEFINITION: The cooling fan motor is inoperative in either high or low speeds. | |||
1 | Did you perform the Diagnostic System Check - Engine Cooling? | Go to Step 2 | |
2 |
Does the cooling fan turn ON and OFF in low speed with each command? | Go to Step 3 | Go to Step 4 |
3 |
Important: A 3 second delay occurs before the engine control module (ECM)/powertrain control module (PCM) changes the cooling fan speed. With a scan tool, command the Fan Control 2 Speed ON and OFF. Does the cooling fan turn ON and OFF in high speed with each command? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 6 |
4 |
Important: Do NOT remove the jumper wire that you will be connecting until your testing is completed. If the low speed fan fuse opens when you connect the jumper wire, repair the cooling fan motor supply voltage circuit of the cooling fan motor for a short to ground. Does the cooling fan operate in low speed? | Go to Step 11 | Go to Step 5 |
5 |
Does the test lamp illuminate? | Go to Step 9 | Go to Step 8 |
6 | Does the cooling fan operate at high speed? | Go to Step 12 | Go to Step 7 |
7 | Inspect the ground circuit of the cool fan high relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 18 | Go to Step 12 |
8 |
Does the test lamp illuminate? | Go to Step 10 | Go to Step 9 |
9 | Inspect the cooling fan motor supply voltage circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 18 | Go to Step 14 |
10 | Inspect the ground circuit of the cooling fan for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 18 | Go to Step 13 |
11 | Inspect for poor connections at the cool fan low relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 18 | Go to Step 15 |
12 | Inspect for poor connections at the cool fan high relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 18 | Go to Step 13 |
13 | Inspect for poor connections at the harness connector of the cooling fan. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 18 | Go to Step 17 |
14 | Inspect the battery positive voltage circuit for an open or high resistance. Refer to Wiring Repairs and Circuit Testing in Wiring Systems. Did you find and correct the condition? | Go to Step 18 | Go to Step 16 |
15 | Replace the cool fan low relay. Did you complete the replacement? | Go to Step 18 | -- |
16 | Replace the cool fan high relay. Did you complete the replacement? | Go to Step 18 | -- |
17 | Replace the cooling fan. Refer to Cooling Fan and Shroud Replacement . Did you complete the replacement? | Go to Step 18 | -- |
18 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
Cooling Fan Inoperative L66
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views DEFINITION: One or both cooling fan motors are inoperative in either high, low, or both speeds. | |||
1 | Did you perform the Engine Cooling Diagnostic System Check? | Go to Step 2 | |
2 | Test the cool fan 1, cool fan 2 and cool fan 3 relay control circuits for an open. Did you find and correct the condition? | Go to Step 29 | Go to Step 3 |
3 |
Do the low speed engine cooling fans turn ON and OFF with each command? | Go to Step 4 | Go to Step 5 |
4 |
Important:: A 3 second delay occurs before the PCM changes the cooling fan speed. With a scan tool, command the Fans Control 2 and 3 ON and OFF. Do the high speed engine cooling fans turn ON and OFF with each command? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 12 |
5 |
Important: Do NOT remove the 20 A fused jumper wire connected during this step. Use a second 20 A fused jumper wire while performing the following steps. Do both cooling fans operate in low speed? | Go to Step 14 | Go to Step 6 |
6 |
Do both cooling fans operate in low speed? | Go to Step 15 | Go to Step 7 |
7 | Reconnect the second 20 A fused jumper between the battery positive voltage circuit of the cooling fan 2 relay and the cooling fan motor supply voltage circuit of the cooling fan 2 relay. Does the right cooling fan operate in high speed? | Go to Step 10 | Go to Step 8 |
8 |
Does the left cooling fan operate in high speed? | Go to Step 17 | Go to Step 9 |
9 | Reconnect the second 20-amp fused jumper wire from the cooling fan motor supply voltage circuit of the right cooling fan electrical connector to a good ground. Does the left cooling fan operate in high speed? | Go to Step 21 | Go to Step 22 |
10 |
Does the right cooling fan operate in high speed? | Go to Step 18 | Go to Step 11 |
11 | Reconnect the second 20-amp fused jumper wire from battery positive voltage to the left cooling fan low reference circuit of the left cooling fan electrical connector. Does the right cooling fan operate in high speed? | Go to Step 19 | Go to Step 23 |
12 | Does the right cooling fan operate in high speed? | Go to Step 13 | Go to Step 16 |
13 |
Does the left cooling fan operate properly in high speed? | Go to Step 15 | Go to Step 20 |
14 | Inspect for poor connections at the cooling fan 1 relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 29 | Go to Step 24 |
15 | Inspect for poor connections at the cooling fan 2 relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 29 | Go to Step 25 |
16 | Inspect for poor connections at the cooling fan 3 relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 29 | Go to Step 26 |
17 | Inspect for poor connections at the harness connector of the right cooling fan. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 29 | Go to Step 27 |
18 | Inspect for poor connections at the harness connector of the left cooling fan. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 29 | Go to Step 28 |
19 | Repair the left cooling fan motor supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 29 | -- |
20 | Repair the left cooling fan motor ground circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 29 | -- |
21 | Repair the right cooling fan motor ground circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 29 | -- |
22 | Repair the right cooling fan motor supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 29 | -- |
23 | Repair the left cooling fan low reference circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 29 | -- |
24 | Replace the cooling fan 1 relay. Did you complete the replacement? | Go to Step 29 | -- |
25 | Replace the cooling fan 2 relay. Did you complete the replacement? | Go to Step 29 | -- |
26 | Replace the cooling fan 3 relay. Did you complete the replacement? | Go to Step 29 | -- |
27 | Replace the right cooling fan. Refer to Engine Coolant Fan Motor Replacement . Did you complete the replacement? | Go to Step 29 | -- |
28 | Replace the left cooling fan. Refer to Engine Coolant Fan Motor Replacement . Did you complete the replacement? | Go to Step 29 | -- |
29 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
