1990 Ford Probe GL, AutomaticFACTORY OEM SERVICE PROCEDURE

3.8L Symptom-To-Diagnostic Flow Chart Menu

3.8L EEC-IV SYMPTOM DIAGNOSTIC

Symptom Go To: Circuit Test (Step No.)
Engine Runs Rough Or Misses, Lack Of Power, Idle Erratic, RPM Surges, Hesitation (1) S (2)
Stalls In Self-Test, Engine Stalls S (1)
Stall During Parking Maneuvers (2) FF (3)
A/C Does Not Cut Off Under WOT Condition
Except 3.8L RWD PFI Models X (52)
3.8L RWD PFI Models KM (15)
A/C Not Functioning
Except 3.8L RWD PFI Models X (50)
3.8L RWD PFI Models KM (1)
Low Idle With A/C On
High Idle In Drive (3.8L RWD PFI A/T) FA (11)
Stumble After Hot Restart FA (20)
Fuel Pump Runs With Engine Off (SC Models) H (20)
Gasoline Fumes Under Hood J (22)
Black Exhaust Smoke KD (1)
Spark Knock (SC Models) H (29)
Low Speed Cooling Fan Does Not Operate High Speed Cooling Fan Does Not Operate Low Or High Speed Cooling Fan Does Not Operate (3) KP (1)
Low Or High Speed Cooling Fan Always On X (19)
3.8L AXOD PFI X (35)
3.8L SC PFI X (38)
High Boost Pressure (SC Models) KS (6)
Shift Indicator Light Always On Or Off (SC Models) 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"/"CHECK DCL" Message On (AXOD Models) ML (25)
"CHECK ENGINE" Message On (AXOD Models) ML (20)
"CHECK ENGINE" Or "SERVICE ENGINE SOON" Light On Intermittently ML (10)
"CHECK ENGINE" Or "SERVICE ENGINE SOON" Light Flashing With Erratic Idle ML (15)
Vehicle Tach Not Operating (SC Models) N (3)
(1) On SC models, if engine Idles rough, check for intercooler Leak.
(2) 3.8L AXOD PFI models only.
(3) Except 3.8L RWD PFI models.
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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