MPV ES V6-2.5L DOHC (2001)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
Engine Controls - DTC P0481 Stored in PCM
Bulletin No: 01-006/03
Last Issued: 3/20/2003
Subject:
DTC P0481 STORED IN PCM
BULLETIN NOTE
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This bulletin supersedes bulletin 01-006/03, issued 3/18/03. The WARRANTY INFORMATION has been revised.
APPLICABLE MODEL(S)/VINs
All 2001 MPV
DESCRIPTION
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 108C 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.
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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 "FAN 1"
"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:
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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.
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WDS shows the calibration part number after programming the PCM.
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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.
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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.
