Signal Too High. Intermittent Fault

Checking Cables And Terminals

WARNING: Before fault-tracing disconnect engine cooling fan (FC) relay connector A so that the engine cooling fan will not run. Diagnostic trouble code (DTC) EFI-514 Engine cooling fan low-speed, signal may be stored. After fault-tracing reconnect connector.

- Check engine coolant temperature (ECT) sensor and engine control module (ECM) connectors for a loose connection and contact resistance and oxidation.
- Check cable between engine coolant temperature sensor terminal 1 and engine control module # A31 for an intermittent open-circuit and an intermittent short-circuit to supply voltage.
- Check cable between engine coolant temperature sensor terminal 2 and control module # A18 for an intermittent open-circuit.

Fault-tracing Information
For intermittent faults fault-tracing is not followed by a verification because the fault is not present at this moment.

- Do you want to repeat fault-tracing?

Yes:
^ Return to Checking Cables And Terminals section above.

No:
^ Operation done.