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.
1990 Ford Probe GL, AutomaticFACTORY OEM SERVICE PROCEDURE
2.5L Symptom-To-Diagnostic Flow Chart Menu
2.5L EEC-IV SYMPTOM DIAGNOSTIC
| Symptom | Go To: Circuit Test (Step No.) | ||||
|---|---|---|---|---|---|
| Engine Runs Rough Or Misses, Lack Of Power, Idle Erratic, RPM Surges, Hesitation | S (2) | ||||
| Stalls In Self-Test, Engine Stalls | S (2) | ||||
| Stall During Parking Maneuvers | FF (3) | ||||
| A/C Does Not Cut Off Under WOT Condition | X (52) | ||||
| A/C Not Functioning | X (50) | ||||
| Low Idle With A/C On | FA (11) | ||||
| High Idle In Drive (A/T Only) | FA (20) | ||||
| Stumble After Hot Restart | H (20) | ||||
| Engine Will Not Restart | QE (1) | ||||
| Fuel Pump Runs With Engine Off | X (14) | ||||
| Gasoline Fumes Under Hood | KD (1) | ||||
| Black Exhaust Smoke | H (29) | ||||
| No Engine Cooling Fan (MTX Only) | X (40) | ||||
| Low Speed Cooling Fan Does Not Operate High Speed Cooling Fan Does Not Operate Low Or High Speed Cooling Fan Does Not Operate (CLC Only) | X (19) | ||||
| Low Or High Speed Cooling Fan Always On | X (35) | ||||
| Shift Indicator Light Always On Or Off | KL (1) | ||||
| "CHECK ENGINE" Or "SERVICE ENGINE SOON" Light Always On | ML (1) | ||||
| "CHECK ENGINE" Or "SERVICE ENGINE SOON" Light Never On | ML (5) | ||||
| "CHECK ENGINE" Or "SERVICE ENGINE SOON" Light On Intermittently | ML (10) | ||||
| "CHECK ENGINE" Or "SERVICE ENGINE SOON" Light Flashing With Erratic Idle | ML (15) | ||||
| Lack Of Cruise Control & Decel Stalls | DP (1) | ||||
| Trans Will Not Shift Into Overdrive | (1) TB (1) | ||||
| No Trans Lock-Up. Cruise RPM Slightly Higher Than Normal (About 300 RPM) | (2) TB | ||||
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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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