Contents: Engine with a working volume of 3.1… ↧ Engine with a working volume of 3.8… ↧ Rear fan ↧ Front fan ↧
Attention! The cooling fan is switched on by a temperature sensor and can be switched on at any time, regardless of whether the engine is running or not. Keep your hands, tools and clothing away from the fan.
4. This procedure should be carried out on a cold engine. Without starting the engine, turn the ignition key to the "on" position and the air conditioner switch to the "off" position, then follow the inspection procedure applicable to your vehicle.
Engine with a working volume of 3.1 liters
5. The cooling fan must be turned off; if so, proceed to step 7. If the fan continues to operate, disconnect its relay (how to find it is described in chapter 12, Section 6). The fan should stop rotating; if so, proceed to the point
6. If the fan continues to rotate, then the black-red wire between the relay and the fan motor is short-circuited - eliminate the short circuit and check for proper operation.
6. Using a 12-volt test light, check the dark green and white wire between the relay and the ECM. If the light remains off, the relay is bad. If it lights up, check to see if the dark green and white wires are shorted. If it is not shorted, the ECM is most likely faulty.
7. Connect the diagnostic terminal to ground (how to find the terminal is described in chapter 6, illustrations 2.6a and 2.6b), which should include a cooling fan. If the fan works, proceed to step 13. If the fan does not work, disconnect the fan relay (how to find it is described in chapter 12, Section 6). "Ring" the red wire and the terminals of the connector of the pink and white wire on the fan relay, connecting the test lamp to the "ground" and to these wires. If the lamp lights up on both terminals, proceed to step 8; if it does not light on one or both terminals, eliminate the short to ground or repair the open circuit in which the lamp does not light.
8. Connect the diagnostic terminal to ground and test the dark green and white wire between the fan relay and the electronic control unit (ECM) with a test lamp connected to a 12 V source.
9. If the lamp is on, proceed to step 10; if it does not light, check to see if the circuit is open or shorted. If the test shows the circuit to be normal, there is a faulty connection in the electronic control unit or the unit itself is faulty.
10. Using fused auxiliary wires, connect the red wire and the dark green and white wire connector terminals to the fan relay. If the fan starts, check the relay connectors; if they are OK, there is a fault in the relay. If the fan does not start, connect a lamp to the fan motor terminals. If the lamp lights up, the electric motor should be replaced (see subsection "Replacing the fan motor" in this section). If the lamp does not light, check each terminal by connecting the test lamp to ground.
11. If the lamp does not light on both terminals, repair the open circuit between the relay and the fan motor. If the lamp lights up on one of the terminals, it means that there is a break in the black ground wire.
12. If no faults are found, further testing should be carried out at a repair shop.
Engine with a working volume of 3.8 liters
Note: The front fan is located in front of the cooling system radiator, the rear fan is located at the back.
13. Fans must be turned off; if so, proceed to step 24. If one or both fans are running, proceed to step 14.
14. If both fans are running, check the coolant temperature sensors and the air conditioner pressure switch. If this check is normal, replace the PCM. If only the front fan operates, proceed to step 15. If only the exhaust fan operates, proceed to step 21.
15. Disconnect the front fan relay (how to find it is described in chapter 12, Section 6). If the fan now turns off, proceed to step 16. If the fan still remains on, check the black/pink wire and the red wire connections to the fan relay and check for shorts in those circuits.
16. Connect a test light between the dark blue and white wire terminal on the blower fan relay and the positive battery terminal. If the lamp lights up, proceed to step 17; if it does not light, replace the front fan relay.
17. Disconnect the air conditioning pressure switch and connect a test lamp to the switch contacts. If the lamp lights, proceed to step 18. If it does not light, replace the air conditioning pressure switch.
18. Disconnect the black multi-pin connector from the PCM. With the lamp connected to a 12V source, check the connection of the dark green to white wire at the air conditioning pressure switch. If the lamp does not light, there is an open circuit either in the dark green and white wire circuit, or in the circuit connecting the black and white wire to the pressure switch.
19. If the lamp is illuminated, disconnect the green connector from the PCM and connect the lamp to the dark blue and white wire terminal of the connector on the front fan relay. If the light does not come on, the PCM is probably faulty. If the light comes on, it may be due to a short to ground in the circuit between the dark blue and white wire and the relay.
20. If no faults are found in the front fan circuit, further diagnostics should be carried out in a repair shop.
21. Disconnect the rear fan relay; if the fan continues to run, check the connections between the black/red wire and the red wire to the front fan relay for a short in that circuit.
22. Once the relay is de-energized and the fan stops, check the connections of the dark green and white wire at the fan relay connector by connecting a 12-volt test light to the positive battery terminal. If the lamp does not light, the relay may be faulty. If it is on, proceed to step 23.
23. Leave the test lamp connected to the dark green and white terminal and disconnect the green connector of the PCM. If the lamp remains lit, there is a short to ground in the dark green and white wire circuit; don't forget to check the connections of its terminals. If the lamp does not light, the PCM may be faulty and should be replaced. If a fault in the rear fan circuit is still not found, further testing should be performed at a repair shop.
24. With the ignition on and the engine off, turn on the air conditioner (the engine must be cold to perform this test). The rear fan should start working. If it works, proceed to step 31; if it doesn't work, proceed to step 34.
Rear fan
25. Disconnect the rear fan relay (how to find this relay is described in chapter 12, Section 6). Connect the test light to the red wire terminal of the exhaust fan relay and then to the pink/white wire terminal of the relay. If the lamp lights on both terminals, proceed to step 26. If it does not light on one or both terminals, check the connections and repair the open circuit(s).
26. Connect the auxiliary wire between the red wire terminal and the black/red wire terminal on the rear fan relay. The fan should start working; if this is the case, proceed to step 29. If the fan does not start, connect one wire of the lamp to the ground and the other to the terminal of the black and red wire on the fan motor, leaving the terminals of the red and black and red wires connected to the fan relay.
27. If the lamp does not light, repair the open circuit of the black-red wire between the rear fan and the relay; don't forget to check the terminals carefully. If the lamp lights, connect it between the fan motor terminals.
28. If the lamp does not light, repair the open circuit of the ground circuit to the fan motor. If the lamp is on, it means that either the fan motor has poor contact or the fan motor itself is faulty.
29. Connect the "ALDL" terminal (see chapter 6, section 2) and connect the lamp to the dark green and white wire terminal on the exhaust fan relay and a 12-volt power source. If the lamp lights up, replace the relay. If it does not light, check to see if the dark green and white wire is shorted or open. If it is not shorted or open, check the Power Control Module (PCM) and the fan relay connection terminals. If everything is in order there, the PCM unit is probably faulty.
30. If the rear fan still does not work, take the vehicle to a repair shop for inspection.
Front fan
31. Disconnect the electrical connector from the coolant temperature sensor. Connect the wire between the terminals on the electrical connector - after 6 seconds the fan should start working. If this happens, proceed to step 32; if not, proceed to step 33.
32. After making sure the air conditioner is off, disconnect the air conditioner pressure switch. After 6 seconds the fan should start working; if it does not work, take the vehicle to a repair shop for inspection.
33. Disconnect the front fan relay and connect one of the lamp terminals to ground, the other to the pink/white wire terminal of the fan relay, and then to the red wire terminal. If the lamp lights in both cases, proceed to step 34. If the lamp does not light, repair the break in the circuit in which the lamp does not light.
34. Connect the auxiliary wire to the black/pink and red wire terminals on the front fan relay. The fan should start working; if this happens, proceed to step 38. If the fan does not start, leave the auxiliary wire on the terminals of the black-pink and red wires and connect one of the lamp terminals to the "ground" and the other to the terminal of the black-pink wire on the fan motor.
35. If the lamp does not light, check the connections of the black/pink wire to the fan relay and to the motor, and also check for an open circuit. If the lamp lights, remove it and connect it between the black and black/pink wire terminals on the fan motor.
36. If the lamp does not light, repair the open in the ground circuit from the engine. If the lamp is on, there is a poor connection at the fan motor or the motor is faulty. To check the fan motor, refer to step 1.
37. If the front fan still does not work, further testing should be carried out at a repair shop.
38. If the fan motor is running when performing step 34, connect the "ALDL" terminal (see chapter 6, section 2) and connect the lamp to the dark blue and white wire terminal on the blower fan relay and the other end of the lamp to a 12V power source.
39. If the lamp is on, the relay is faulty. If it does not light, check to see if the dark blue and white wire is open or shorted. Also check the rear fan relay terminal of the dark blue and white wire and the terminal of the PCM unit. If they "ring", the PCM unit itself is probably faulty.
40. If the front fan still does not work, further testing should be carried out at a repair shop.