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DATA MONITOR (SPEC) MODE NHEC0034S11 Monitored item [Unit] ECM signals Main signals Description Remarks ENG SPEED [rpm] q q I Indicates the engine speed computed MAS A/F SE-B1 [V] q q I The signal voltage of the mass air flow I When engine is running specification B/FUEL SCHDL q I “Base fuel schedule” indicates the fuel I When engine is running specification A/F ALPHA-B1 [%] q I The mean value of the air-fuel ratio I When engine is running specification I This data also includes the data for the ACTIVE TEST MODE NHEC0034S07 TEST ITEM CONDITION JUDGEMENT CHECK ITEM (REMEDY) FUEL INJECTION I Engine: Return to the original I Change the amount of fuel injec- If trouble symptom disappears, see I Harness and connector I Fuel injectors I Front heated oxygen sensor IACV-AAC/V I Engine: After warming up, idle I Change the IACV-AAC valve Engine speed changes according I Harness and connector I IACV-AAC valve ENG COOLANT I Engine: Return to the original I Change the engine coolant tem- If trouble symptom disappears, see I Harness and connector I Engine coolant temperature sen- I Fuel injectors IGNITION TIMING I Engine: Return to the original I Timing light: Set I Retard the ignition timing using If trouble symptom disappears, see I Adjust initial ignition timing POWER BAL- I Engine: After warming up, idle I A/C switch “OFF” I Shift lever “N” I Cut off each injector signal one Engine runs rough or dies. I Harness and connector I Compression I Injectors I Power transistor I Spark plugs I Ignition coils COOLING FAN I Ignition switch: ON I Turn the cooling fan “ON” and Cooling fan moves and stops. I Harness and connector I Cooling fan motor I Cooling fan relay FUEL PUMP I Ignition switch: ON I Turn the fuel pump relay “ON” Fuel pump relay makes the operat- I Harness and connector I Fuel pump relay GI MA EM LC FE AT AX SU BR ST RS BT HA SC EL IDX ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION CONSULT-II (Cont’d) EC-99 |