13B-1 GROUP 13B MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> CONTENTS GENERAL INFORMATION . . . . . . . . 13B-2 FUEL PUMP CONNECTOR DISCONNECTION (HOW TO REDUCE PRESSURIZED FUEL LINES) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13B-556 MULTIPORT FUEL INJECTION (MFI) FUEL PUMP OPERATION CHECK . . . . . . 13B-556 DIAGNOSIS . . . . . . . . . . . . . . . . . . . . 13B-4 MULTIPORT FUEL INJECTION (MFI) RELAY TROUBLESHOOTING STRATEGY . . . . . . 13B-4 AND FUEL PUMP RELAY CONTINUITY TROUBLE CODE DIAGNOSIS. . . . . . . . . . 13B-4 CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13B-556 FAIL-SAFE/BACKUP FUNCTION TABLE . 13B-17 INTAKE AIR TEMPERATURE SENSOR DIAGNOSTIC TROUBLE CODE CHART . . 13B-18 CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13B-556 SYMPTOM CHART. . . . . . . . . . . . . . . . . . . 13B-21 ENGINE COOLANT TEMPERATURE DIAGNOSTIC TROUBLE CODE SENSOR CHECK . . . . . . . . . . . . . . . . . . . . 13B-556 PROCEDURES. . . . . . . . . . . . . . . . . . . . . . 13B-24 THROTTLE POSITION SENSOR CHECK . 13B-557 SYMPTOM PROCEDURES . . . . . . . . . . . . 13B-411 HEATED OXYGEN SENSOR CHECK . . . . 13B-557 DATA LIST REFERENCE TABLE . . . . . . . 13B-517 INJECTOR CHECK . . . . . . . . . . . . . . . . . . . 13B-560 ACTUATOR TEST REFERENCE TABLE. . 13B-529 IDLE AIR CONTROL MOTOR CHECK AT THE ENGINE CONTROL MODULE (STEPPER MOTOR) CHECK . . . . . . . . . . . 13B-560 (ECM)OR POWERTRAIN CONTROL EVAPORATIVE EMISSION PURGE MODULE (PCM) . . . . . . . . . . . . . . . . 13B-531 SOLENOID CHECK . . . . . . . . . . . . . . . . . . 13B-560 INSPECTION PROCEDURE USING AN EGR SOLENOID CHECK . . . . . . . . . . . . . . 13B-560 OSCILLOSCOPE . . . . . . . . . . . . . . . . . . . . 13B-536 INJECTOR . . . . . . . . . . . . . . . . . . . . . 13B-561 SPECIAL TOOLS. . . . . . . . . . . . . . . . 13B-546 REMOVAL AND INSTALLATION . . . . . . . . 13B-561 ON-VEHICLE SERVICE. . . . . . . . . . . 13B-547 THROTTLE BODY ASSEMBLY . . . . . 13B-563 COMPONENT LOCATION . . . . . . . . . . . . . 13B-547 REMOVAL AND INSTALLATION . . . . . . . . 13B-563 THROTTLE BODY (THROTTLE VALVE DISASSEMBLY AND ASSEMBLY . . . . . . . 13B-565 AREA) CLEANING . . . . . . . . . . . . . . . . . . . 13B-551 INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 13B-566 THROTTLE POSITION SENSOR ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . 13B-552 SPECIFICATIONS . . . . . . . . . . . . . . . 13B-567 BASIC IDLE SPEED ADJUSTMENT . . . . . 13B-552 FASTENER TIGHTENING FUEL PRESSURE TEST . . . . . . . . . . . . . . 13B-554 SPECIFICATION . . . . . . . . . . . . . . . . . . . . . 13B-567 GENERAL SPECIFICATIONS . . . . . . . . . . 13B-567 SERVICE SPECIFICATIONS . . . . . . . . . . . 13B-568 SEALANT . . . . . . . . . . . . . . . . . . . . . . . . . . 13B-568 13B-2 MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> GENERAL INFORMATION . G ENER A L IN FO R M ATIO N M1131000100132 The Multiport Fuel Injection System consists of addition, when the air conditioning switch is turned sensors which detect the engine conditions, the off and on while the engine is idling, the IAC motor ENGINE CONTROL MODULE (ECM) / adjusts the throttle valve bypass air amount POWERTRAIN CONTROL MODULE (PCM) according to the engine load conditions to avoid which controls the system based on signals from fluctuations in the engine speed. these sensors, and actuators which operate under the control of the ECM /PCM . The ECM IGNITION TIMING CONTROL /PCM carries out activities such as fuel The ignition power transistor located in the ignition injection control, idle air control, and ignition timing primary circuit turns ON and OFF to control the control. In addition, the ECM /PCM is primary current flow to the ignition coil. This controls equipped with several diagnostic test modes which the ignition timing to provide the optimum ignition simplify troubleshooting when a problem develops. timing with respect to the engine operating conditions. The ignition timing is determined by the FUEL INJECTION CONTROL ECM /PCM from engine speed, intake The injector drive times and injector timing are air volume, engine coolant temperature, and controlled so that the optimum air/fuel mixture is atmospheric pressure. supplied to the engine to correspond to the continually-changing engine operation conditions. A DIAGNOSTIC TEST MODE single injector is mounted at the intake port of each