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.
1987 Ford Cab & Chassis 5.8 H, 4WD, AutomaticFACTORY OEM SERVICE PROCEDURE
Code/Test Menu (KOEO)
KEY ON ENGINE OFF (KOEO) CIRCUIT TEST MENU
| Code No. | Go To: Circuit Test No. (Step No.) |
|---|---|
| 15 | HH (9) |
| 19 | HH (14) |
| 21 | F (1) |
| 22 | G (1) |
| 23 | I (1) |
| 24 | D (1) |
| 31 (2.3L EFI) | E (1) |
| 31 (2.9L EFI) | J (1) |
| 31 (4.9L EFI & 5.0L EFI) | L (1) |
| 32 (4.9L EFI & 5.0L EFI) | L (22) |
| 34 (2.9L EFI) | J (8) |
| 34 (4.9L EFI & 5.0L EFI) | L (12) |
| 35 (2.9L EFI) | J (5) |
| 35 (4.9L EFI & 5.0L EFI) | L (5) |
| 51 | F (4) |
| 52 | P (1) |
| 53 | I (11) |
| 54 | D (5) |
| 61 | F (6) |
| 63 | I (6) |
| 64 | D (7) |
| 67 | M (1) |
| 81 | V (8) |
| 83 (2.3L EFI) | E (18) |
| 84 (2.3L EFI) | E (18) |
| 84 (2.9L EFI) | J (11) |
| 84 (4.9L EFI & 5.0L EFI) | L (8) |
| 85 | W (6) |
| 87 | T (7) |
| 89 | DD (1) |
Factory Service Tools
Use the Manual With the Right Hardware
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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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