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 MANUALSFORD1991CAB & CHASSIS 5.8 H, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 5.8LCODE-TO-TEST MENUS - 5.8L (2-DIGIT CODES)KOER CODE-TO-TEST MENU - 5.8L (2-DIGIT CODES)
1991 Ford Cab & Chassis 5.8 H, Automatic
KOER Code-To-Test Menu - 5.8L (2-Digit Codes)
1991 Ford Cab & Chassis 5.8 H, AutomaticSECTION KOER Code-To-Test Menu - 5.8L (2-Digit Codes)
KOER SELF-TEST - CIRCUIT TEST & STEP MENU
| Code No. | Go To: Test No. (Step No.) |
|---|---|
| 12 | KE (1) |
| 13 | KE (15) |
| 18 | PA (1) |
| 21 | DA (1) |
| 22 | DF (7) |
| 23 | DH (1) |
| 24 | DA (1) |
| 26 | TC (21) |
| 31 | DN (1) |
| 32 | DN (25) |
| 33 | DN (40) |
| 34 | DN (50) |
| 35 | DN (5) |
| 41 | H (1) |
| 42 | H (1) |
| 44 | KC (1) |
| 45 | KC (1) |
| 46 | KC (1) |
| 65 | TC (5) |
| 72 | DF (10) |
| 73 | DH (20) |
| 74 | FD (1) |
| 77 | M (1) |
| 98 | Go to QUICK TEST |
| No Codes/Codes Not Listed | QA (1) |
RENDER: 1.0x
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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.