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.
1979 Toyota Pickup SR5FACTORY OEM SERVICE PROCEDURE
1974 Models
- Disconnect speedometer cable at transmission. Disconnect connector harness from computer. Using a 10 ohm resistor, connect positive lead of ohmmeter to computer connector speed sensor terminal. Connect negative ohmmeter lead to a known good ground.
- Have an assistant turn speedometer cable by hand and count number of needle sweeps at ohmmeter. Four needle sweeps should occur for every one revolution of speedometer cable.
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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