System Inspection

Inspection/ Fan Operation
1. Connect the data link connector terminals TFA and GND with a jumper wire.
2. Turn ignition switch ON.




3. Verify that electrical coolant fans operate.

Inspection/ Relay Operation
1. Connect the SST (Special Service Tool) (Engine Signal Monitor Adaptor Harness) to the ECM (Engine Control Module).
2. Turn ignition switch ON.
3. Short the ECM terminals and verify that the coolant fan relays operate in the order shown below.








4. If not as specified check the harness and relays.