13A-1 GROUP 13A MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> CONTENTS GENERAL DESCRIPTION. . . . . . . . . 13A-3 ON-VEHICLE SERVICE . . . . . . . . . . 13A-1191 COMPONENT LOCATION . . . . . . . . . . . . . 13A-1191 MULTIPORT FUEL INJECTION (MFI) THROTTLE BODY (THROTTLE VALVE DIAGNOSIS . . . . . . . . . . . . . . . . . . . . 13A-6 AREA) CLEANING . . . . . . . . . . . . . . . . . . . 13A-1197 TROUBLESHOOTING STRATEGY . . . . . . 13A-6 FUEL PRESSURE TEST . . . . . . . . . . . . . . 13A-1197 DIAGNOSTIC FUNCTION . . . . . . . . . . . . . 13A-6 FUEL PUMP CONNECTOR DISCONNECTION FAIL-SAFE FUNCTION REFERENCE (HOW TO REDUCE PRESSURIZED FUEL TABLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-39 LINES) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-1200 DIAGNOSTIC TROUBLE CODE CHART . . 13A-41 FUEL PUMP OPERATION CHECK . . . . . . 13A-1200 SYMPTOM CHART. . . . . . . . . . . . . . . . . . . 13A-46 MULTIPORT FUEL INJECTION (MFI) RELAY AND THROTTLE ACTUATOR DIAGNOSTIC TROUBLE CODE CONTROL MOTOR RELAY CONTINUITY PROCEDURES. . . . . . . . . . . . . . . . . . . . . . 13A-50 CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-1202 SYMPTOM PROCEDURES . . . . . . . . . . . . 13A-1011 FUEL PUMP RELAY CONTINUITY DATA LIST REFERENCE TABLE . . . . . . . 13A-1147 CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-1203 GENERAL SCAN TOOL (GST) MODE 01 INTAKE AIR TEMPERATURE SENSOR REFERENCE TABLE . . . . . . . . . . . . . . . . . 13A-1158 CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-1203 ACTUATOR TEST REFERENCE TABLE. . 13A-1169 ENGINE COOLANT TEMPERATURE CHECK AT THE ENGINE CONTROL MODULE SENSOR CHECK . . . . . . . . . . . . . . . . . . . . 13A-1204 (ECU)OR THE POWERTRAIN HEATED OXYGEN SENSOR CHECK . . . . 13A-1204 CONTROL MODULE (PCM) . . . . . . 13A-1171 INJECTOR CHECK . . . . . . . . . . . . . . . . . . . 13A-1207 INSPECTION PROCEDURE USING AN THROTTLE ACTUATOR CONTROL OSCILLOSCOPE . . . . . . . . . . . . . . . . . . . . 13A-1179 MOTOR CHECK . . . . . . . . . . . . . . . . . . . . . 13A-1207 ENGINE OIL CONTROL VALVE CHECK . . 13A-1208 SPECIAL TOOLS. . . . . . . . . . . . . . . 13A-1189 EVAPORATIVE EMISSION PURGE SOLENOID CHECK . . . . . . . . . . . . . . . . . . 13A-1208 EVAPORATVE EMISSION VENTILATION SOLENOID CHECK . . . . . . . . . . . . . . . . . . 13A-1208 EGR VALVE CHECK. . . . . . . . . . . . . . . . . . 13A-1208 Continued on next page 13A-2 INJECTOR . . . . . . . . . . . . . . . . . . . . 13A-1209 FASTENER TIGHTENING REMOVAL AND INSTALLATION . . . . . . . . 13A-1209 SPECIFICATIONS . . . . . . . . . . . . . . 13A-1215 FASTENER TIGHTENING THROTTLE BODY ASSEMBLY . . . 13A-1212 SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . 13A-1215 REMOVAL AND INSTALLATION . . . . . . . . 13A-1212 GENERAL SPECIFICATIONS . . . . . . . . . . 13A-1215 SERVICE SPECIFICATIONS . . . . . . . . . . . 13A-1217 ENGINE CONTROL MODULE (ECM) SEALANT AND ADHESIVE . . . . . . . . . . . . 13A-1217 AND POWERTRAIN CONTROL MODULE (PCM). . . . . . . . . . . . . . . . 13A-1214 REMOVAL AND INSTALLATION . . . . . . . . 13A-1214 MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> GENERAL DESCRIPTION 13A-3 GENERAL DESCRIPTION M1131000102246 . . The Multiport Fuel Injection System consists of sen- IDLE AIR CONTROL sors, actuators and the engine control module (ECM) The idle speed is kept at the optimum speed by con- or the powertrain control module (PCM) trolling the amount of air that passes through the . The sensors detect the engine condition. The throttle valve in accordance with changes in idling ECM or the PCM controls the system conditions and engine load during idling. based on signals from these sensors. The actuators The ECM or the PCM drives the throt- work under the control of the ECM or the tle actuator control motor to keep the engine running PCM . The ECM or the PCM car- at the pre-set idle target speed in accordance with ries out activities such as fuel injection control, throt- the engine coolant temperature and A/C and other tle valve opening control, idle air control, and ignition electrical load. In addition, when the air conditioning timing control. In addition, the ECM or the switch is turned off and on while the engine is idling, PCM has several diagnostic test modes which the throttle actuator control motor adjusts the throttle simplify troubleshooting when a problem develops. valve pass-through air amount according to the . engine load conditions to avoid fluctuations in the FUEL INJECTION CONTROL engine speed. The ECM or the PCM controls injector . drive times and injection timing to supply the opti- IGNITION TIMING CONTROL mum air/fuel mixture to the engine according to the The ignition power transistor located in the ignition continually-changing engine operation conditions. A primary circuit turns on and off to control primary cur- single injector is mounted at the intake port of each rent flow to the ignition coil. This maintains ignition cylinder. The fuel pump supplies pressurized fuel timing at an optimum level regardless of various from the fuel tank to the fuel injectors. The fuel pres- engine operating conditions. The ECM or the sure regulator controls the fuel pressure. Thus, the PCM determines the ignition timing according regulated fuel is distributed to each injector. Fuel is to engine speed, intake air volume, engine coolant normally injected for each cylinder every two rota- temperature, and atmospheric pressure. tions of the crankshaft. The firing order is 1-3-4-2. Each cylinder has a dedicated fuel injector. This is . called "multiport". The ECM or the PCM DIAGNOSTIC TEST MODE provides a richer air/fuel mixture by carrying