Jeep Cherokee’88 Fuel System Throttle Body Injection Operation Testing and Troubleshooting
The 1988 Jeep Cherokee, Comanche, Wagoneer and Wrangler Throttle Body Injection (TBI) system is a single injector system that introduces fuel into throttle body from above throttle plate. Fuel injector, located within throttle body, is controlled by the Electronic Control Unit (ECU). The ECU is a sealed microprocessor that receives input signals from several sensors and other related engine components. Based on these inputs, ECU generates output signals that control and adjust air/fuel mixture and ignition timing as necessary for proper engine performance. ECU also controls engine idle speed, emission control systems, upshift indicator light (manual transmission only), and A/C compressor clutch.
This article discuss the 1988 Jeep Cherokee, Comanche, Wagoneer and Wrangler Fuel Injection System operation, testing and troubleshooting. The Fuel Injection system consists of electronic control unit (ECU), Fuel Injector, Fuel Pressure Regulator, Fuel Pump, Idle Speed Actuator Motor, Oxygen Sensor, manifold air/ fuel temperature sensor, manifold absolute pressure sensor, throttle position sensor, wide open throttle switch, closed throttle switch, upshift indicator light, engine speed sensor, power steering pressure switch, and relays.
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