Fault-Tracing Information

Fault-tracing information

Condition




- No diagnostic trouble codes (DTCs) stored.
- The fault is permanent

Possible source
- Open-circuit, short-circuit to ground or supply on signal cable between ECC control module #A15 and power unit #A1.
- Open-circuit, short-circuit to ground or supply on signal cable between ECC control module #A5 and power unit #A3.
- Open-circuit on power supply or ground lead to blower fan.
- Blower fan or power unit disconnected.
- Contact resistance in terminals.
- Defective power unit.

Fault symptom[s]
- Blower fan does not operate.
- Blower fan runs at one speed only.