Cooling System: Testing and Inspection
Cooling Fan Control Inspection1. Verify that the engine is cold.
2. Turn the ignition switch to ON.
3. Verify that the cooling fan is not operating.
4. If the cooling fan is operating, do as follows.
Special Service Tool New Generation Star Tester Connected to Data Link Connector 2:
a. Connect the Special Service Tools New Generation Star (NGS) tester to the data link connector-2.
b. Select the PID/DATA MONITOR AND RECORD function on the NGS display.
c. Select the "FANC" and verify that the cooling fan control signal is OFF.
d. If the cooling fan control signal is ON, check the following.
- PCM terminal voltage
- Engine coolant temperature signal
e. If the cooling fan control signal is OFF, check the following.
- Cooling fan relay
- Short circuit in wiring harnesses and connectors (Main relay - Cooling fan relay - PCM)
5. Connect the Special Service Tool (System Selector) to the data link connector.
6. Set switch A to position 1.
7. Set the test switch to SELF TEST.
8. Depress the accelerator pedal and verify that the cooling fan operates.
9. If the cooling fan does not operate, do as follows.
a. Connect the Special Service Tools (NGS) to the data link connector 2.
b. Select the SIMULATION TEST function on the NGS display.
c. Turn the cooling fan relay from OFF to ON by using the "FANC" and check for the cooling fan operation.
d. If the cooling fan operates, check the following. PCM terminal throttle position sensor signal voltage.
e. If the cooling fan does not operate, do as follows.
- Turn the cooling fan relay from OFF to ON by using the simulation function. Operate the cooling fan relay and check it the operation sound of the relay is heard.
f. If the operation sound is heard, check the following.
- Wiring harnesses and connectors (Cooling fan relay - Cooling fan motor)
- Cooling fan motor
g, If the operation sound is heard, check the following.
- Cooling fan relay
- Open circuit in wiring harnesses and connectors (Main relay Cooling fan relay - PCM)