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.
1988 Toyota 4Runner Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Air Pump
- Check air pump for abnormal noise and replace as necessary. Disconnect air pump output hose from ASV on Land Cruiser and ABV on Pickup. Attach Air Pump Tester (SST 09258-14010), with a .217" (5.51 mm) orifice, to hose. See Fig 1.
- Start engine and increase engine speed to 1200 RPM on Land Cruiser and 1800 RPM on Pickup. Tester gauge should read in Green area. If reading is in Red area, replace air pump assembly.
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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