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(5) Insert fuel injector nozzles into openings in intake manifold. Seat the injectors in place. Tighten (6) Attach electrical connectors to fuel injectors, refer to the fuel injector connector section for electri- (7) Connect fuel supply tube to fuel rail. Refer to Quick Connect Fittings in the Fuel Delivery Section FUEL PUMP RELAY DESCRIPTION The fuel pump relay is located in the PDC. The inside top of the PDC cover has a label showing relay OPERATION The fuel pump relay supplies battery voltage to the fuel pump. A buss bar in the Power Distribution Cen- The PCM controls the fuel pump relay by switch- ing the ground path for the solenoid side of the relay IDLE AIR CONTROL MOTOR DESCRIPTION The Idle Air Control (IAC) solenoid is mounted on the throttle body. The PCM operates the idle air con- OPERATION The PCM adjusts engine idle speed through the idle air control solenoid to compensate for engine The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The PCM adjusts engine idle speed by moving the IAC solenoid pintle in and out of the bypass passage. The adjustments are based on inputs the PCM When engine rpm is above idle speed, the IAC is used for the following functions: • Off-idle dashpot • Deceleration air flow control • A/C compressor load control and power steering (also opens the passage slightly before the compres- Target Idle Target idle is determined by the following inputs: • ECT Sensor • Battery voltage • Ambient/Battery Temperature Sensor • VSS • TPS • MAP Sensor REMOVAL REMOVAL When servicing throttle body components, always reassemble components with new O-rings and seals (1) Disconnect negative cable from battery. Fig. 27 Idle Air Control Solenoid—Typical 14 - 34 FUEL INJECTION PL/SRT-4 FUEL INJECTOR (Continued) |