Additional (Condenser) Fan(s) Does Not Operate
Additional (Condenser) Fan(s) Does Not OperateNote: If the blower fan motor also does not operate, Refer "Blower Motor Does Not Operate,". Blower Motor Does Not Operate
Circuit Diagram
Normal operation of additional fan(s)
The additional fan(s) is supplied with battery voltage as shown:
1. A/C and blower switches are turned ON.
2. ECU receives signal that A/C and blower switches are ON and creates ground circuit.
3. A/C relay is magnetized and contact is closed.
4. Additional fan relay is magnetized and contact is closed.
5. Battery voltage is applied to additional fan(s) and fan(s) operates.
Note
^ The ECU also controls additional fan(s) and magnetic clutch operation, depending on the engine load.
^ The number of additional fans is related to the engine and transmission combination as follows:
Step 1
1 Check the fuses.
2. If the fuses are OK, go to Step 2.
3. If a fuse is burned, check for a short circuit in the harness before replacing it.
Step 2
1. Disconnect the negative battery cable.
2. Disconnect the additional fan relay connector.
3. Connect a jumper wire between terminal-wires (B/W) and (L) of the relay connector.
4. Reconnect the negative battery cable, and check whether the additional fan(s) operates.
5. If the fan(s) operates, disconnect the jumper wire and reconnect the additional fan relay connector, and go to Step 5.
6. If the fan(s) does not operate, disconnect the jumper wire and go to Step 3.
Step 3
- Measure the voltage at terminal-wire (B/W) of the additional fan relay connector.
Step 4 Additional fan test
1. Disconnect the additional fan connector(s).
2. Apply battery voltage to terminal a and ground terminal b.
3. Check whether the additional fan(s) operates.
Step 5
1. Disconnect the negative battery cable.
2. Disconnect the A/C relay connector.
3. Connect a jumper wire between terminal-wires (B/W) and (Y) of the relay connector.
4. Reconnect the negative battery cable, and check whether the additional fan(s) operates.
5. If the fan(s) operates, disconnect the jumper wire and go to Step 10.
6. If the fan(s) does not operate, leave the jumper wire connected and go to Step 6.
Step 6
1. Disconnect the refrigerant pressure switch connector.
2. Measure the voltage between terminal-wire (Y) and a body ground.
Step 7
- Check for continuity between terminals of the refrigerant pressure switch.
Step 8
1. Turn the ignition switch OFF.
2. Connect a high-pressure hose of the manifold gauge to the high-pressure gauge fitting.
3. Measure the refrigerant pressure of the high-pressure side.
Measurement pressure: High-pressure side Above 230 kPa (2.35 kgf/cm2, 33.4 psi)
4. If not as specified, check the refrigerant system by referring to the flowchart "Insufficient Cooling; No Cooling; Intermittent Cooling". Insufficient Cooling; No Cooling; Intermittent Cooling
5. If correct, replace the refrigerant pressure switch.
Note: The refrigerant pressure switch opens the power circuit when refrigerant pressure is below 230 kPa (2.35 kgf/cm2, 33.4 psi) or above 2,060 kPa (21.0 kgf/cm2, 299 psi).
Step 9 Additional fan relay test
1. Remove the additional fan relay.
2. Check continuity between terminals 3 and 4.
3. Apply battery voltage to terminal 1 and ground terminal 2.
4. Check continuity between terminals 3 and 4.
Step 10
1. Remove the A/C switch.
2. Check continuity between terminals of the switch as shown.
3. If not as specified, replace the switch.
4. If correct, go to Step 11.
Step 11
1. Turn the ignition switch ON.
2. Turn the blower switch ON.
3. Measure the voltage at terminal-wire (G) of the A/C switch connector.
Step 12
1. Turn the ignition switch ON.
2. Turn the blower switch ON.
3. Measure the voltage at terminal-wires (L/W) and (R/B) of the thermoswitch connector.