For 1990-2009 cars

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. |

1. 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 the electric cooling fan operates at low speed.
2. The electric cooling fan operates at low speed because the engine coolant fan resistor is in series with the electric cooling fan motor.

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. |

1. When the secondary cooling fan temperature switch reaches 105°C (221°F), terminal 2 of the secondary cooling fan temperature switch is grounded, the fan control relays K28 and K52 are energized, and ground is supplied to terminal B of the auxiliary engine coolant fan #1 through fan control relay K52. B+ for the auxiliary engine coolant fan #1 is supplied by the previously energized fan control relay K26.
2. When B+ is supplied to terminal A and ground is supplied to terminal B of the auxiliary engine coolant fan #1, the auxiliary engine coolant fan #1 will operate at normal speed.
3. The fan control relay K28 supplies B+ to terminal A of the auxiliary engine coolant fan #2. Terminal B of the auxiliary engine coolant fan #2 is permanently grounded. The auxiliary engine coolant fan runs at normal speed.

1. The auxiliary engine coolant fan #1 does not operate at normal speed. Refer to Cooling Fan Inoperative - Auxiliary .
2. The auxiliary engine coolant fan #2 does not operate at normal speed. Refer to Cooling Fan Inoperative - Auxiliary .

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.