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 Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Do the low speed engine cooling fans turn ON and OFF with each command? | Go to Step 3 | Go to Step 4 |
3 |
Important:: A 3 second delay occurs before the powertrain control module (PCM) or engine control module (ECM) changes the cooling fan speed. With a scan tool, command the Fan Control Relay 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 | Go to Step 6 |
4 |
Important: Do NOT remove the jumper wire that you will be connecting until your testing is completed. If the cool fan 1 fuse opens when you connect the jumper wire, repair the cooling fan motor supply voltage circuit of the left cooling fan motor for a short to ground. Do both cooling fans operate in low speed? | Go to Step 14 | Go to Step 5 |
5 |
Does the test lamp illuminate? | Go to Step 9 | Go to Step 8 |
6 | Does the left cooling fan operate at high speed? | Go to Step 16 | Go to Step 7 |
7 | Inspect the ground circuit of the S/P fan relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 15 |
8 |
Does the test lamp illuminate? | Go to Step 12 | Go to Step 13 |
9 |
Does the test lamp illuminate? | Go to Step 11 | Go to Step 10 |
10 | Inspect the cooling fan motor supply voltage circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 15 |
11 | Inspect the ground circuit of the right cooling fan for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition? | Go to Step 25 | Go to Step 18 |
12 | Inspect the cooling fan low reference circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 17 |
13 | Inspect the cooling fan motor supply voltage circuit of the left cooling fan for an open or high resistance. Refer to Circuit Testing Wiring Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 19 |
14 | Inspect for poor connections at the cool fan 1 relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 20 |
15 | Inspect for poor connections at the S/P fan relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 21 |
16 | Inspect for poor connections at the cool fan 2 relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 22 |
17 | 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 . Did you find and correct the condition? | Go to Step 25 | Go to Step 23 |
18 | 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 . Did you find and correct the condition? | Go to Step 25 | Go to Step 24 |
19 | Repair the battery positive voltage circuit for an open or high resistance. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 25 | -- |
20 | Replace the cool fan 1 relay. Did you complete the replacement? | Go to Step 25 | -- |
21 | Replace the S/P fan relay. Did you complete the replacement? | Go to Step 25 | -- |
22 | Replace the cool fan 2 relay. Did you complete the replacement? | Go to Step 25 | -- |
23 | Replace the left cooling fan. Refer to Cooling Fan and Shroud Replacement . Did you complete the replacement? | Go to Step 25 | -- |
24 | Replace the right cooling fan. Refer to Cooling Fan and Shroud Replacement . Did you complete the replacement? | Go to Step 25 | -- |
25 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
