1A
DTC P0481: Fan 2 (A/C Condenser Fan) Control Circuit
Wiring Diagram
1. Ignition switch 4. ECM 7. “IGN2” fuse
2. A/C condenser fan control relay 5. “IG2 SIG” fuse 8. “A/C” fuse
3. A/C condenser fan motor 6. Relay box 9. To blower heater relay
DTC Detecting Condition and Trouble Area
DTC detecting condition Trouble area
Monitor signal of A/C condenser fan control relay is different from command signal.
(2 driving cycle detecting logic)
• A/C condenser fan control relay
• A/C condenser fan control relay circuit
• ECM
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 10 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.
DTC Troubleshooting
WARNING:
Keep hands, tools, and clothing away from A/C condenser fan to help prevent personal injury. This fan is electric and can come on whether or not the engine is running. The fan can start automatically in response to the ECT sensor with the ignition switch in the “ON” position.
Step Action YES NO
1
Was “Engine and Emission Control System Check” performed?
Go to Step 2.
Go to Engine and Emission Control System Check:M13A with VVT .
2
A/C condenser fan control relay circuit check
1) Check for proper connection to ECM at “E117-12” terminal with ignition switch turned OFF.
2) Measure voltage between “E117-12” terminal of ECM connector and vehicle body ground under the following condition.
Voltage between “E117-12” terminal of ECM connector and vehicle body ground
While engine running, A/C switch and heater blower switch ON: 0 – 1 V
While engine running, A/C switch and heater blower switch OFF: 10 – 14 V
Is each voltage within specified value?
Intermittent trouble. Check for intermittent referring to Intermittent and Poor Connection Inspection .
Go to Step 3.
3
A/C condenser fan control relay power supply circuit check
1) Remove A/C condenser fan control relay (1) with ignition switch turned OFF.
2) Check for proper connection to A/C condenser fan control relay at “LT GRN” and “PNK/BLK” wire terminals.
3) If OK, measure voltage between “LT GRN” wire terminal of A/C condenser fan control relay connector and vehicle body ground with ignition switch turned ON.
Is voltage 10 – 14 V?
Go to Step 4.
“LT GRN” and/or “RED/BLU” wire in open or high resistance circuit.
4
A/C condenser fan control relay circuit check
1) Disconnect connectors from ECM with ignition switch turned OFF.
2) Measure resistance between “E117-12” terminal of ECM connector and vehicle body ground.
Is resistance infinity?
Go to Step 5.
“PNK/BLK” wire shorted to ground circuit.
5
A/C condenser fan control relay check
1) Check A/C condenser fan control relay referring to Main Relay, Fuel Pump Relay, A/C Compressor Relay and A/C Condenser Fan Control Relay Inspection:M13A .
Is check result satisfactory?
“PNK/BLK” wire in open circuit. If wire is OK, substitute a known-good ECM and recheck.
Replace A/C condenser fan control relay.
NOTE:
Upon completion of inspection and repair work, perform “DTC Confirmation Procedure” and confirm that the trouble has been corrected.