Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Cooling Schematics , HVAC Schematics , in HVAC Systems - Automatic or HVAC Schematics in HVAC Systems - Manual Connector End View Reference: Cooling System Connector End Views DEFINITION: One or both engine cooling fan motors run continuously in high or low speed. | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 | Turn ON the ignition, with the engine OFF. Are one or both cooling fans ON? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
3 | Are both cooling fans running continuously? | Go to Step 4 | Go to Step 6 |
4 | Are both cooling fans running continuously in high speed? | Go to Step 5 | Go to Step 7 |
5 | Test the low reference circuit of the A/C refrigerant pressure sensor for an open. 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 |
6 | Remove the cool fan 3 or S/P relay. Did the right cooling fan turn OFF? | Go to Step 10 | Go to Step 8 |
7 | Remove the cool fan 1 relay. Did the cooling fans turn OFF? | Go to Step 12 | Go to Step 9 |
8 | Remove the cool fan 2 relay. Did the right cooling fan turn OFF? | Go to Step 13 | Go to Step 11 |
9 | Repair the short to voltage in the left cooling fan motor supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 18 | -- |
10 | Repair the short to voltage in the left cooling fan low reference circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 18 | -- |
11 | Repair the short to voltage in the right cooling fan motor supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 18 | -- |
12 | Inspect for poor connections at the cool fan 1 relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Repairs. Did you find and correct the condition? | Go to Step 18 | Go to Step 15 |
13 | Inspect for poor connections at the cool fan 2 relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Repairs. Did you find and correct the condition? | Go to Step 18 | Go to Step 16 |
14 | Inspect for poor connections at the A/C refrigerant pressure sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Repairs. Did you find and correct the condition? | Go to Step 18 | Go to Step 17 |
15 | Replace the cool fan 1 relay. Did you complete the replacement? | Go to Step 18 | -- |
16 | Replace the cool fan 2 relay. Did you complete the replacement? | Go to Step 18 | -- |
17 | Replace the A/C refrigerant pressure sensor. Refer to Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement in Heating, Ventilation, and Air Conditioning. 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 2 |
