[13A] MULTIPORT FUEL INJECTION (MPI) <4G63> - - TROUBLESHOOTING - DIAGNOSIS FUNCTION | PRINT PAGE / INDEX / PRIOR / NEXT

| DIAGNOSIS FUNCTION
| ENGINE WARNING LAMP (CHECK ENGINE LAMP)
| If an abnormality occurs in any of the following items related to the Multipoint Fuel Injection (MPI) system, the engine warning lamp will illuminate. If the lamp remains illuminated or if the lamp illuminates while the engine is running, check the diagnosis code output.
Engine warning lamp inspection items
Engine -A/T-ECU
Air flow sensor
Intake air temperature sensor
Throttle position sensor
Engine coolant temperature sensor
Crank angle sensor
Camshaft position sensor
Barometric pressure sensor <DOHC>
Detonation sensor
Oxygen sensor
Oxygen sensor heater
Injector
Ignition coil
EGR control solenoid valve
Exhaust gas recirculation system
Abnormal fuel system
| METHOD OF READING AND ERASING DIAGNOSIS CODES Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points .
| INSPECTION USING MUT-II DATA LIST AND ACTUATOR TESTING Carry out inspection by means of the data list and the actuator test function, if there is an abnormality, check and repair the chassis harness and components. After repairing, re-check using the MUT-II and check that the abnormal input and output have returned to normal as a result of the repairs. Erase the diagnosis code memory. Remove the MUT-II, and then start the engine again and carry out a road test to confirm that the problem has disappeared.
| INSPECTION USING MUT-III DATA LIST AND ACTUATOR TESTING Carry out inspection by means of the data list and the actuator test function, if there is an abnormality, check and repair the chassis harness and components. After repairing, re-check using the MUT-III and check that the abnormal input and output have returned to normal as a result of the repairs. Erase the diagnosis code memory. Remove the MUT-III, and then start the engine again and carry out a road test to confirm that the problem has disappeared.
FAIL-SAFE FUNCTION REFERENCE TABLE When the main sensor malfunctions are detected by the diagnosis function, the vehicle is controlled by means of the pre-set control logic to maintain safe conditions for driving.
Malfunctioning item | Control contents during malfunction
--- | ---
Air flow sensor | Uses the throttle position sensor signal and engine speed signal (crank angle sensor signal) to take reading of the basic injector drive time and basic ignition timing from the pre-set mapping. Fixes the idle speed control servo in the appointed position so idle control is not performed.
Intake air temperature sensor | Controls as if the intake air temperature is 45°C.
Throttle position sensor (TPS) | No increase in fuel injection amount during acceleration due to the throttle position sensor signal.
Engine coolant temperature sensor | Controls as if the engine coolant temperature is 80°C.
Camshaft position sensor | Injects fuel to all cylinders simultaneously. (However, after the ignition switch is turned to ON, the No. 1 cylinder top dead centre is not detected at all.) Cuts off the fuel supply 4 seconds after detecting a malfunction. (However, after the ignition switch is turned to ON, the No. 1 cylinder top dead centre is not detected at all.)
Detonation sensor | Fixes the ignition timing as that for regular gasoline.
Ignition coil (incorporating power transistor) | Cuts off the fuel supply to cylinders with an abnormal ignition.
Alternator FR terminal | Does not control the output of the alternator according to an electrical load. (works as a normal alternator)

[13A] MULTIPORT FUEL INJECTION (MPI) <4G63> - - TROUBLESHOOTING - DIAGNOSIS FUNCTION | PRINT PAGE / INDEX / PRIOR / NEXT

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