Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Cooling Schematics Connector End View Reference: Component Connector End Views DEFINITION: One or both cooling fan motors are inoperative in either high/low speed 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 |
Note: A 3 second delay occurs before the powertrain control module (PCM) changes the cooling fan speed. With a scan tool, command the Fans High Speed 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 |
Note: Do not remove the connected jumper wire 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 right 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 right 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 problem? | 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 problem? | Go to Step 25 | Go to Step 15 |
11 | Inspect the ground circuit of the left cooling fan for an open or high resistance. Refer to Circuit Testing and Wiring Repairs.
Did you find and correct the problem? | 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 problem? | Go to Step 25 | Go to Step 17 |
13 | Inspect the cooling fan motor supply voltage 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 problem? | Go to Step 25 | Go to Step 19 |
14 | Inspect the low speed cooling fan relay for poor connections. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the problem? | 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 problem? | Go to Step 25 | Go to Step 21 |
16 | Inspect the high speed cooling fan relay for poor connections. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the problem? | Go to Step 25 | Go to Step 22 |
17 | Inspect the harness connector of the right cooling fan for poor connections. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the problem? | Go to Step 25 | Go to Step 23 |
18 | Inspect the harness connector of the left cooling fan for poor connections. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the problem? | 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 repairs? | Go to Step 25 | -- |
20 | Replace the low speed fan 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 high speed fan relay. Did you complete the replacement? | Go to Step 25 | -- |
23 | Replace the right cooling fan. Refer to Fan Replacement. Did you complete the replacement? | Go to Step 25 | -- |
24 | Replace the left cooling fan. Refer to Fan Replacement. Did you complete the replacement? | Go to Step 25 | -- |
25 | Operate the system in order to verify the repairs. Did you correct the problem? | System OK | Go to Step 3 |
