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.
1989 Ford Tempo BaseFACTORY OEM SERVICE PROCEDURE
KOER Code/Test Menu
KOER SELF-TEST - CIRCUIT TEST & STEP MENU (2.3L)
| Code No. | Go To: Circuit Test No. (Step No.) | ||
|---|---|---|---|
| 12 | D5 (1) | ||
| 13 | D5 (13) | ||
| 16 (OHC MPFI) | D5 (1) | ||
| 17 (Turbo MPFI) | D5 (22) | ||
| 18 (HSC MPFI) | D13 (1) | ||
| 21 | B5 (1) | ||
| 22 (OHC MPFI) & (HSC MPFI) | B6 (7) | ||
| 22 (Turbo MPFI) | B6 (7) | ||
| 23 | B8 (1) | ||
| 24 (OHC MPFI & HSC MPFI) | B2 (1) | ||
| 24 (Turbo MPFI) | B1 (1) | ||
| 25 (OHC MPFI) | B7 (1) | ||
| 25 (Turbo MPFI) | B7 (1) | ||
| 26 (Turbo MPFI) | B9 (1) | ||
| 28 (Turbo MPFI) | B1 (1) | ||
| 31 (OHC MPFI) | B4 (1) | ||
| 31 (HSC MPFI) | B10 (16) | ||
| 32 (OHC MPFI) | B4 (8) | ||
| 32 (HSC MPFI) | B10 (15) | ||
| 33 (OHC MPFI) | B4 (8) | ||
| 33 (HSC MPFI) | B10 (20) | ||
| 34 (OHC MPFI) | B4 (8) | ||
| 34 (Turbo MPFI) | D1 (1) | ||
| 34 (HSC MPFI) | B10 (19) | ||
| 35 (OHC MPFI) | B4 (17) | ||
| 35 (HSC MPFI) | B10 (19) | ||
| 41 | C1 (10) | ||
| 42 | C1 (22) | ||
| 52 (HSC MPFI) | B15 (5) | ||
| 72 (OHC MPFI) & (HSC MPFI) | B6 (10) | ||
| 73 | B8 (10) | ||
| 74 (OHC MPFI) | B14 (1) | ||
| 75 (OHC MPFI) | B14 (4) | ||
| 76 (Turbo MPFI) | B9 (10) | ||
| 77 | D10 (1) | ||
| 98 | (1) | ||
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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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