Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1987 Ford Mustang L4-140 2.3L SOHCFACTORY OEM SERVICE PROCEDURE
Multiple Function Warning Indicator
This system monitors engine oil, cooling system, fuel and washer reservoir levels for low fluid level conditions. During engine starting the lamps will be illuminated for approximately 3 seconds as a bulb check out. After approximately 3 seconds, when the bulb check is completed, low fluid level conditions will be verified, if present.
The low engine oil warning lamp is used to indicate when engine oil level is 1 1/2 quarts or more below the specified level. The lamp will be illuminated during engine starting. If oil level is sufficient, the lamp will go off when engine is operating. If oil level is low the lamp will remain on until engine oil is added and the ignition switch is placed in the Off position. The module will take approximately 90 to 150 seconds to reset. If the engine is started during this period, the last recorded reading will be displayed.
The Low Coolant Warning Lamp will be illuminated whenever coolant level in the coolant recovery bottle is below the cold full mark. Raise coolant level in recovery bottle to the cold full mark to turn lamp off.
The low fuel warning lamp will be illuminated whenever fuel level is 1/8 tank capacity or less. Add fuel to vehicle to turn lamp off.
The Washer Fluid Warning Lamp will be illuminated whenever reservoir level is below 1/3 capacity. Raise washer fluid level in reservoir to turn lamp off.
The low engine oil warning lamp is used to indicate when engine oil level is 1 1/2 quarts or more below the specified level. The lamp will be illuminated during engine starting. If oil level is sufficient, the lamp will go off when engine is operating. If oil level is low the lamp will remain on until engine oil is added and the ignition switch is placed in the Off position. The module will take approximately 90 to 150 seconds to reset. If the engine is started during this period, the last recorded reading will be displayed.
The Low Coolant Warning Lamp will be illuminated whenever coolant level in the coolant recovery bottle is below the cold full mark. Raise coolant level in recovery bottle to the cold full mark to turn lamp off.
The low fuel warning lamp will be illuminated whenever fuel level is 1/8 tank capacity or less. Add fuel to vehicle to turn lamp off.
The Washer Fluid Warning Lamp will be illuminated whenever reservoir level is below 1/3 capacity. Raise washer fluid level in reservoir to turn lamp off.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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