Blower Motor Relay - Erroneous MIL ON, DTC P0443
NUMBER: 08-07-00GROUP: Electrical
DATE: Mar.03, 2000
SUBJECT:
Erroneous MIL Due To DTC P0443 (Purge Ckt) And/Or A Possible Key-Off Battery Draw
OVERVIEW:
This bulletin involves the replacement of the heater-NC blower motor relay.
MODELS:
1999 (DN) Durango
SYMPTOM/CONDITION:
The vehicle Malfunction Indicator Lamp (MIL) may illuminate due to a Diagnostic Trouble Code (DTC) P0443 - Evaporative Purge Solenoid Circuit. The MIL will normally illuminate shortly after the initial start of the vehicle engine due to a previously performed diagnostic circuit test by the powertrain control module (PCM).
NOTE:
THIS CONDITION MAY CAUSE A SMALL ELECTRICAL DRAIN ON THE BATTERY, WHEN THE IGNITION KEY IS IN THE OFF POSITION, WHICH OVER AN EXTENDED PERIOD OF TIME MAY DISCHARGE THE BATTERY.
While the evaporative purge solenoid electrical circuit is working as designed, the DTC P0443 generated may be due to an electrical feedback condition into the powertrain control module. The electrical feedback may be due to the heater-A/C blower motor relay remaining energized after the engine has been turned off. If the relay remains closed (energized), and if the heater-A/C selector is in the OFF mode, then electrical feedback may partially power the PCM.
The new blower motor relay is designed to prevent this condition from occurring.
DIAGNOSIS:
1. If DTC's other than P0443 are present then they must be diagnosed and corrected prior to proceeding any further with this Technical Service Bulletin (TSB).
2. If only DTC P0443 (Evaporative Purge Solenoid Circuit) is occurring, then verify that TSB # 18-35-98 has been performed and proceed with the Repair Procedure.
PARTS REQUIRED:
1 05018962AA Relay, Blower Motor
REPAIR PROCEDURE:
The heater-A/C blower motor relay is located in the Power Distribution Center (PDC) which can be found in the engine compartment.
1. Install the new heater-A/C blower motor relay (p/n 05018962AA) into the PDC.
2. If still present, erase the current P0443 DTC from the memory of the PCM.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No: 08-65-15-91 0.2 Hrs.
FAILURE CODE: P8- New Part