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.
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HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 29 (ENGINE CONTROLS - TESTS W/CODES - EEC 2.5L)CIRCUIT TESTSCIRCUIT TEST SCG - SOLENOID CONTROLLED BY GROUNDSOLENOID FUNCTION TEST
1991 Mercury Tracer Base, 4D Sedan, Automatic
Solenoid Function Test
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Solenoid Function Test
WARNING: This page is about a different car, the 1994 Ford Probe. However, it is still accessible from the selected car via links, so may be relevant.
To further diagnose solenoid, ensure PCM and related circuits are capable of operating solenoid. When test procedure requires simulated PCM solenoid activation, check function of appropriate solenoid. Solenoid should function as follows.
- BANK/INJ Solenoid should activate during cranking and while engine is running.
- CANP With engine temperature more than 140°F (60°C), solenoid should activate during vehicle cruise or acceleration.
- EGRC With engine temperature more than 140°F (60°C), solenoid should activate at normal driving (cruising).
- EGRV With engine temperature more than 140°F (60°C), solenoid should activate during idle, deceleration or at wide open throttle.
- EVR With engine temperature more than 158°F (70°C), solenoid should activate when engine speed is less than 1500 RPM.
- FPRC Coolant temperature more than 158°F (70°C) and intake air temperature more than 68°F (20°C). Solenoid should activate with engine speed less than 1500 RPM and remain activated for 2 minutes after engine is started.
- HSIA Solenoid should activate when engine speed is less than 5000 RPM.
- IAC Solenoid should activate during engine cranking and running.
- VRIS Solenoid should activate with engine at low speed.
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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.