F 150 4WD Pickup V8-302 5.0L (1986)
Emissions Maintenance Light: Technical Service Bulletins
Emission Maintenance Warning Module - Service
Article No. 89-22-8
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EMISSION MAINTENANCE WARNING MODULE SERVICE INFORMATION
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LAMP - "EMISSIONS/CHECK ENGINE" - EMISSION MAINTENANCE WARNING MODULE - SERVICE INFORMATION
LIGHT TRUCK:
1985-89 BRONCO 1985-87 BRONCO II 1985-89 ECONOLINE, F-150, F-250, F-350 1985-88 RANGER 1986-87 AEROSTAR
MEDIUM/HEAVY TRUCK: 1988-90 F & B SERIES
ISSUE:
The Emission Maintenance Warning "EMW" module operates a light that is located on the instrument panel. For 1985-87 model year
vehicles, the light will display the word "EMISSIONS". For 1988-89 model year vehicles, the light will display the words "CHECK
ENGINE". When the light is lit, it is indicating that the 60,000 mile emission maintenance should be performed. After the maintenance is
performed the EMW module must be reset to zero time. Another type of module is the "IMS" module. This module is not part of the light
circuit and does not require maintenance. At a predetermined time, the IMS module directs the EEC IV processor to make a strategy
change. A third type of module is the "COMBO" module. This module combines the functions of the IMS and the EMW modules.
ACTION:
Refer to the following module application charts for the specific vehicle application and location of the different types of modules.
NOTE:
FOR APPLICATIONS NOT LOSTED IN THE FOLLOWING MODULE APPLICATION CHARTS, THE "CHECK ENGINE" LIGHT
IS CONTROLLED BY THE EEC IV PROCESSOR. THESE VEHICLES DO NOT USE THE "EMW" MODULE.
1985 & 1986 MODULE APPLICATION CHART
1987 MODULE APPLICATION CHART
