Step | Action | Normal Result(s) | Abnormal Result(s)* |
|---|---|---|---|
1 | Check in order to ensure that the electric cooling fan operates at normal speed when the primary cooling fan temperature switch reaches the appropriate temperature. | When the primary cooling fan temperature switch reaches 110°C (230°F), terminal 3 of the primary cooling fan temperature switch is grounded, the fan control relay K67 is energized, and the electric cooling fan operates at normal speed. | The electric cooling fan does not operate at normal speed. Refer to Cooling Fan Inoperative . |
2 | Check in order to ensure that the electric cooling fan operates at low speed when the primary cooling fan temperature switch reaches the appropriate temperature. |
| The electric cooling fan does not operate at low speed. Refer to Cooling Fan Inoperative at Low Speed - Electric . |
3 | Check in order to ensure that the auxiliary engine coolant fan #1 and auxiliary engine coolant fan #2 operate at low speed when the primary cooling fan temperature switch reaches the appropriate temperature. | When the primary cooling fan temperature switch reaches 100°C (212°F), terminal 2 of the primary cooling fan temperature switch is grounded, the fan control relay K26 is energized, and B+ is supplied to terminal A of the auxiliary engine coolant fan #1. The auxiliary engine coolant fan #1 is wired in series with the auxiliary engine coolant fan #2 through the normally closed contacts of the fan control relay K52. The fans will run at a lower speed until the fan control relay K52 is energized. | The auxiliary engine coolant fan #1 and auxiliary engine coolant fan #2 do not operate at low speed. Refer to Cooling Fan Inoperative - Auxiliary |
4 | Check in order to ensure that the auxiliary engine coolant fan #1 and auxiliary engine coolant fan #2 operate at normal speed, when the primary cooling fan temperature switch and the secondary cooling fan temperature switch reach their appropriate temperatures. |
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5 | Check in order to ensure that the auxiliary engine coolant fan #1 and auxiliary engine fan #2 operate at low speed when the A/C compressor clutch coil is energized. | When the A/C compressor clutch coil is enegized the fan control relay K87 is enegized, and B+ is supplied to terminal A of the auxiliary engine coolant fan #1. The auxiliary engine coolant fan #1 is wired in series with the auxiliary engine coolant fan #2 through the normally closed contacts of the fan control relay K52. The fans will run at low speed until the fan control relay K52 is energized. | The auxiliary engine coolant fan #1 and auxiliary engine coolant fan #2 do not operate at low speed. Refer to Cooling Fan Inoperative - Auxiliary . |
6 | Check in order to ensure that the auxiliary engine coolant fan #1 and auxiliary engine fan #2 operate at normal speed when the A/C compressor refrigerant pressure switch reaches the appropriate pressure. | When the A/C compressor refrigerant pressure switch reaches 1900 kPa (275 PSI), terminal 3 of the A/C compressor refrigerant pressure switch is grounded, the fan control relay K28 is energized, and the auxiliary engine coolant fan #1 and auxiliary engine coolant fan #2 operate at normal speed. | The auxiliary engine coolant fan #1 and auxiliary engine coolant fan #2 do not operate at normal speed. Refer to Cooling Fan Inoperative - Auxiliary . |
7 | Check in order to ensure that the ECM cooling blower operates at normal speed when the A/C compressor refrigerant pressure switch reaches the appropriate pressure. | When the A/C compressor refrigerant pressure switch reaches 1900 kPa (275 PSI), terminal 3 of the A/C compressor refrigerant pressure switch is grounded, the ECM relay K48 is energized, and the ECM cooling blower operates at normal speed. | The ECM cooling blower does not operate at normal speed. Refer to Engine Control Module Cooling Blower Inoperative . |
8 | Check in order to ensure that the water auxiliary pump operates at normal speed when the ignition key is in the ON position. | When the ignition key is turned to the ON position, the auxiliary water pump relay K22 is energized and the water auxiliary pump operates at normal speed. | The water auxiliary pump does not operate at normal speed. Refer to Auxiliary Water Pump Inoperative . |
9 | Check in order to ensure that the heater water auxiliary pump operates at normal speed when the ignition key is in the ON position. | When the ignition key is in the ON position, B+ is supplied to terminal 2 of the heater water auxiliary pump and the heater water auxiliary pump operates at normal speed. | The heater water auxiliary pump does not operate at normal speed. Refer to Cooling Fan Circuit Diagnosis . |
* Refer to the appropriate symptom diagnostic table for the applicable abnormal result. | |||
