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US BULLETIN No: 01-006/03 DATE: 2003
CAN BULLETIN No: N/A
APPLIES TO: 2001 MPV AFFECTED VINs: All
SUBJECT: DTC P0481 stored in PCM
BULLETIN NOTES: Applicable to all 2001 models
DETAILS:

Some vehicles may exhibit DTC P0481 (Cooling fan relays malfunction) stored in the PCM.

The false DTC detection occurs when the A/C refrigerant pressure switch is ON but the cooling fan relay is turned OFF by the PCM because the coolant temperature is 108°C degrees and under. The PCM stores DTC P0481 because the cooling fan is operating without PCM control command. This is due to improper PCM calibration.

Customers having this concern should have their vehicle repaired using the following procedure.

REPAIR PROCEDURE

  1. Confirm the cooling fan is operating normally by activating the cooling fan relays using either one of the following methods.
    • Connect DLC terminals TEN and GND with a jumper wire and open the throttle valve with the ignition switch ON.
    • Activate the simulation function on the NGS tester with either the ignition switch ON and engine off, or during idle. Select the "FAN1", "FAN2" or "FAN3" PID for the cooling fan relay.
  2. Using WDS (Version B22NM or later), reprogram the PCM to the latest calibration. Use the table below to confirm the correct calibration:
    NOTE:
    • It is not necessary to remove any fuses or relays during PCM reprogramming when the WDS screen prompts you to do so. You may accidentally stop power to one of the PCM terminals and cause the PCM to be blanked or you may receive error messages during the WDS reprogramming procedure.
    • WDS shows the calibration part number after programming the PCM.
    • Please be aware that PCM calibration part numbers and file names listed in any Service Bulletin may change due to future releases of WDS software and additional revisions made to those calibrations for service related concerns. When reprogramming a PCM, WDS will always display the "latest" calibration P/N available for that vehicle. If any calibration has been revised/updated to contain new information for a new service concern/issue, it will also contain all previously released calibrations.
    • When performing this procedure, if the WDS PTU is not docked and connected to 115V-120V, we recommend that a battery charger be installed on the vehicle battery and turned ON to a maximum charge of no more than 20 AMPS to keep the vehicle battery up to capacity. If you exceed 20 AMPS it will damage the WDS PTU.
       
    PCM Calibration Part Number File Name
    1ALU-12A650-SA QJAAEA0
    1ALU-12A650-TA QJAAEB0
    1ALU-12A650-UA QJAAFA0
    1ALU-12A650-VA QJAAFB0
    1ALU-12A650-XA QJAAGA0
    1ALU-12A650-YA QJAAGB0
  3. Install revised PCM calibration sticker in the appropriate position (next to vehicle emissions label) with the calibration P/N provided in the table above.
  4. Road test the vehicle to relearn the "Keep Alive Memory" (KAM) strategy.
  5. Verify repair.

WARRANTY INFORMATION

Note: This information applies to verified customer complaints on vehicles covered under normal warranty. Refer to the SRT microfiche for warranty term information.

Warranty Type A
Symptom Code 64 
Damage Code 9W 
Part Number Main Cause ****-18-881  
Quantity
Operation Number XXX492XRX 
Labor Hours 0.7 hrs. 
CONSUMER NOTICE:
The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by "do-it-yourselfers." Consumers should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies, consumers should contact their nearest authorized Mazda dealership.
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