Room Fuse - MIL ON/DTC P1794 in Memory

Article No.
96-24-5

11/18/96

^ MALFUNCTION INDICATOR LAMP (MIL)
ILLUMINATION - DIAGNOSTIC TROUBLE CODE
(DTC) P1794 STORED IN CONTINUOUS MEMORY -
PROBE WITH 2.5L, ESCORT WITH 1.8L, AND ASPIRE

^ LAMP - MALFUNCTION INDICATOR LAMP (MIL)
ILLUMINATION - DIAGNOSTIC TROUBLE CODE
(DTC) P1794 STORED IN CONTINUOUS MEMORY -
PROBE WITH 2.5L, ESCORT WITH 1.8L, AND ASPIRE

FORD:
1996 ESCORT
1996-97 ASPIRE, PROBE

This TSB article is being republished in its entirety to include the 1997 Aspire and Probe.

ISSUE:
The Malfunction Indicator Lamp (MIL) may illuminate with no driveability concern present and Diagnostic Trouble Code (DTC) P1794 stored in continuous memory. This may be due to the Powertrain Control Module (PCM) finding insufficient voltage to keep backup memory activated. The backup memory stores DTCs while the engine is not running.

ACTION:
Check for a missing or open "ROOM" fuse in the fuse box and repair. If the fuse is good, clear the DTC stored in memory. Refer to the following Service Procedure for details.

SERVICE PROCEDURE

1. Verify DTC P1794 is present and repair using the following procedure.

NOTE:
DTC P1794 CAN BE GENERATED BY THE FOLLOWING: 1) WHEN THE "ROOM" FUSE IS INSTALLED WHILE THE IGNITION IS SWITCHED TO THE "RUN" POSITION, 2) IF THE "ROOM" FUSE IS OPEN WHILE IGNITION IS ON SUCH AS DURING THE INSTALLATION OF AFTERMARKET ACCESSORIES, AND 3) IN THE CASE OF A SHORT CIRCUIT THAT WOULD OPEN THE FUSE.

NOTE:
SERVICE PERSONNEL PERFORMING PRE-DELIVERY INSPECTIONS (PDI) SHOULD USE THIS INFORMATION TO DIAGNOSE VEHICLES IN INVENTORY. IF THE "ROOM" FUSE IS INSTALLED AFTER THE ENGINE IS STARTED (APPROXIMATELY 7 SECONDS AFTER STARTING THE ENGINE) THE MIL WILL ILLUMINATE AND DTC P1794 WILL BE STORED IN MEMORY.





2. Inspect the "ROOM" fuse. Proceed to the table as shown.

3. If the MIL still illuminates, refer to the 1996 Aspire Service Manual and the 1996 Powertrain Control/Emissions Diagnosis (PC/ED) Service Manual for troubleshooting and repair information.

OTHER APPLICABLE ARTICLES: NONE

SUPERSEDES: 96-17-7

WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage And Emissions Warranty Coverage

OPERATION DESCRIPTION TIME

9624O5A Replace ROOM Fuse 0.2 Hr.

DEALER CODING
CONDITION
BASIC PART NO. CODE
14526 28

OASIS CODES: 206000, 698298