Table 1: | Reference Table |
Symptom | Causes | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Fan motors inoperative in high speed only |
| ||||||||||||
Fan motors inoperative in low speed only |
| ||||||||||||
One fan motor only inoperative |
| ||||||||||||
Both fan motors inoperative |
|
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views DEFINITION: The cooling fan motors are inoperative in low speed. | |||
1 | Did you review the Cooling System Description and Operation and perform the necessary inspections? | Go to Step 2 | |
2 |
Do the cooling fans operate at low speed? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the test lamp illuminate? | Go to Step 10 | Go to Step 4 |
4 |
Do the cooling fans operate at low speed? | Go to Step 5 | Go to Step 7 |
5 | Test the fan 1 relay coil supply voltage circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 6 |
6 | Test the fan 1 relay coil control circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
7 | Test the fan motor low speed ground circuit for an open between the fan motors and the fan 1 relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 8 |
8 | Repair the open in the fan motor low speed ground circuit between the fan 1 relay and S240. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | -- |
9 | Inspect for a poor connection at the harness connector of the 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 13 | Go to Step 11 |
10 | Inspect for a poor connection at the harness connector of the fan motor. 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 13 | Go to Step 12 |
11 | Replace the fan 1 relay. Refer to Cooling Fan Relay Replacement . Did you complete the replacement? | Go to Step 13 | -- |
12 | Replace the fan motor. Refer to Engine Cooling Fan Replacement . Did you complete the replacement? | Go to Step 13 | -- |
13 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Table 1: | Reference Table |
Symptom | Causes | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Fan motors inoperative in high speed only |
| ||||||||||||
Fan motors inoperative in low speed only |
| ||||||||||||
One fan motor only inoperative |
| ||||||||||||
Both fan motors inoperative |
|
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views DEFINITION: The cooling fan motors are inoperative in high speed. | |||
1 | Did you review the Cooling System Description and Operation and perform the necessary inspections? | Go to Step 2 | |
2 |
Do the cooling fans operate at high speed? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the test lamp illuminate? | Go to Step 10 | Go to Step 4 |
4 |
Do the cooling fans operate at high speed? | Go to Step 5 | Go to Step 7 |
5 | Test the fan 2 relay coil supply voltage circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 6 |
6 | Test the fan 2 relay coil control circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
7 | Test the fan motor high speed ground circuit for an open between the fan motors and the fan 2 relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 8 |
8 | Repair the open in the fan motor high speed ground circuit between the fan 2 relay and S240. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | -- |
9 | Inspect for a poor connection at the harness connector of the 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 13 | Go to Step 11 |
10 | Inspect for a poor connection at the harness connector of the fan motor. 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 13 | Go to Step 12 |
11 | Replace the fan 2 relay. Refer to Cooling Fan Relay Replacement . Did you complete the replacement? | Go to Step 13 | -- |
12 | Replace the fan motor. Refer to Engine Cooling Fan Replacement . Did you complete the replacement? | Go to Step 13 | -- |
13 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Table 1: | Reference Table |
Symptom | Causes | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Fan motors inoperative in high speed only |
| ||||||||||||
Fan motors inoperative in low speed only |
| ||||||||||||
One fan motor only inoperative |
| ||||||||||||
Both fan motors inoperative |
|
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views DEFINITION: One cooling fan motor is inoperative. | |||
1 | Did you review the Cooling System Description and Operation and perform the necessary inspections? | Go to Step 2 | |
2 |
Does the cooling fan operate? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the test lamp illuminate in each speed? | Go to Step 7 | Go to Step 4 |
4 | Test the fan motor low speed ground circuit for an open between the fan motor and S156. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 5 |
5 | Test the fan motor high speed ground circuit for an open between the fan motor and S157. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 6 |
6 | Repair the open in the fan motor supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | -- |
7 | Inspect for a poor connection at the harness connector of the fan motor. 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 9 | Go to Step 8 |
8 | Replace the fan motor. Refer to Engine Cooling Fan Replacement . Did you complete the replacement? | Go to Step 9 | -- |
9 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |