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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSFORD1991CAB & CHASSIS 5.8 H, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 7.5LCODE-TO-TEST MENUS - 7.5L (2-DIGIT CODES)KOEO CODE-TO-TEST MENU - 7.5L (2-DIGIT CODES)
1991 Ford Cab & Chassis 5.8 H, Automatic
KOEO Code-To-Test Menu - 7.5L (2-Digit Codes)
1991 Ford Cab & Chassis 5.8 H, AutomaticSECTION KOEO Code-To-Test Menu - 7.5L (2-Digit Codes)
KOEO SELF-TEST - CIRCUIT TEST & STEP MENU
| Code No. | Go To: Test No. (Step No.) |
|---|---|
| 15 | QB (3) |
| 19 | Replace Processor |
| 21 | DA (1) |
| 22 | DF (1) |
| 23 | DH (2) |
| 24 | DA (1) |
| 26 | TC (21) |
| 31 | DN (1) |
| 32 | DN (25) |
| 34 | DN (20) |
| 35 | DN (1) |
| 47 | TC (5) |
| 51 | DA (10) |
| 53 | DH (3) |
| 54 | DA (10) |
| 56 | TC (25) |
| 61 | DA (20) |
| 63 | DH (1O) |
| 64 | DA (20) |
| 66 | TC (27) |
| 67 | TA (1) |
| 82 | KC (8) |
| 85 | KD (6) |
| 87 | J (7) |
| 89 | TC (12) |
| 91 | TC (12) |
| 92 | TC (12) |
| 93 | TC (12) |
| 94 | TC (12) |
| 95 | J (20) |
| 96 | J (30) |
| 97 | TC (5) |
| 98 | TC (15) |
| 99 | TC (15) |
| No Codes/Codes Not Listed | QA (1) |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.