6-92 ENGINE GENERAL INFORMATION AND DIAGNOSIS
DTC P0481 A/C Condenser Fan Control Circuit Malfunction
CIRCUIT DESCRIPTION
1. Ignition switch
DTC DETECTING CONDITION
• Low voltage at terminal E18-18 when ECM doesn't out-
put A/C ON signal to A/C amplifier or when engine cool-
ant temp. is not 110 °C (230 °F) or more.
✱ ✱ ✱ ✱ 2 driving cycle detection logic, continuous monitoring.
DTC CONFIRMATION PROCEDURE
1) Turn ignition switch OFF.
2) Clear DTC with ignition switch ON.
3) Start engine and then turn both A/C switch and heater blower switch ON for 2 sec or more.
4) Run engine at idle for 5 sec or more which A/C switch and heater blower switch OFF.
5) Check DTC and pending DTC.
3. A/C condenser fan relay
5. A/C condenser fan
• "P/B" or "Lg" circuit open or short
• Condenser fan motor relay malfunction
• ECM malfunction
7. Fuse box
POSSIBLE CAUSE