Engine Controls - Tests W/Codes - 4.0L: Summary
If no service code or Code 11 or 111 (pass code) is present, but drive-ability problem still exists, proceed to EEC-IV DIAGNOSIS BY SYMPTOM table. If driveability problem still cannot be located, go to TESTS W/O CODES article in the ENGINE PERFORMANCE Section for diagnosis by symptoms or intermittent diagnostic procedures.
EEC-IV DIAGNOSIS BY SYMPTOM
| Symptom | Application (1) | Circuit Test | ||
|---|---|---|---|---|
| A/C Does Not Cut Off During WOT | All Models | KM - Step 15) | ||
| A/C Not Functioning | All Models | KM - Step 1) | ||
| Black Exhaust Smoke | Except 7.3L | H - Step 1) | ||
| CHECK ENGINE Light Always On | Except 7.3L | ML - Step 1) | ||
| CHECK ENGINE Light Flashing With Erratic Idle | Except 7.3L | ML - Step 15) | ||
| CHECK ENGINE Light Never On | Except 7.3L | ML - Step 4) | ||
| CHECK ENGINE Light On Intermittently | Except 7.3L | ML - Step 10) | ||
| Difficult Start | Ranger 2.3L | NB - Step 25) | ||
| Engine Hesitates After Hot Restart | Except 7.3L | H - Step 21) | ||
| Engine Hesitation | Except 7.3L | S - Step 2) | ||
| Engine Lacks Power or Loses Power | Except 7.3L | S - Step 2) | ||
| Engine Miss At Idle, Acceleration Or Cruise | Except 7.3L | S - Step 2) | ||
| Engine Runs Rough At All Times | Except 7.3L | S - Step 2) | ||
| Engine Stalls | Except 7.3L | S - Step 2) | ||
| Engine Stalls During Trans. Downshift | Models With A/T | TC - Step 1) | ||
| Engine Stalls During Trans. Engagement | Models With A/T | TC - Step 1) | ||
| Engine Stalls When Parking | Models With PSP Switch | FF - Step 2) | ||
| Engine Surge At Acceleration Or Cruise | Except 7.3L | S - Step 1) | ||
| Erratic RPM | Except 7.3L | S - Step 1) | ||
| Gasoline Fumes | Modls With CANP | KD - Step 1) | ||
| Late Shift Into 4x4 High | Models With A/T | TB - Step 5) | ||
| Overdrive Cancel Indicator Off | Models With A/T | TB - Step 4) | ||
| 4x4 Low Light Always Off & Harsh Shift | Models With A/T | TB - Step 1) | ||
| 4x4 Low Light Always On & Shift Slipping | Models With A/T | TB - Step 1) | ||
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