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Turn diagnostic mode selector on ECU fully clockwise and wait until inspectionlamps flash.The codes are displayed in numerical orderstarting with the lowest and ending with the highest. Nissan altima ka24de timing marks code#The codes are interpretedby the number of times and duration the diode flashes.The red diode will flash for 0.6 of a second with 0.6 of a second delay betweenflashes “X” number of times, this will represent units of ten.Then there will be a delay 0.9 of a second and the red diode will flash for0.3 of a second with 0.3 of a second delay between flashes “X” number of times,this will represent units of one.There will be a delay of 2.1 seconds between codes.For example, if the red diode flashes once and then flashes twice rapidly thisshould be interpreted as code 12. READING DIAGNOSTIC CODES The Electronic Control Unit (ECU) monitors several engine sensors and actuators.If a problem occurs the information is stored in the ECU’s memory for retrieval.The codes are displayed by the red diode on the ECU. Mode V (Real time diagnosis): if a malfunction is present duringa driving test, the inspection lamps will display the malfunction conditionimmediately.Mode IV (Switches on/off diagnosis): during this mode, the inspectionlamps monitor switch on/off condition of the throttle valve switch,starter switch and vehicle speed sensor.The red inspection lamp correspondsto units of 10 the green inspection lamp corresponds to units of one. Mode III (Self diagnosis): in this mode the DTC is indicated by boththe red and greed inspection lamp.The green inspection lamp function is the same as inMode I. During an open loop condition, the red inspectionlamp stays off. Mode II (Mixture ratio feedback control monitor B): during a closedloop condition, the red inspection lamp turns on and off simultaneouslywith the green inspection lamp when mixture ratio is controlled withina predetermined value.During anopen loop condition, the green inspection lamp stays off. Mode I (Mixture ratio feedback control monitor A): during a closedloop condition, the green inspection lamp turns on when lean conditionis present and goes off when a rich condition is present.For description of modes, proceed as follows:.On all models, when ignition is turned Off during diagnosis, in eachmode, and then turned back On again after power to the ECU has dropped offcompletely, diagnosis will automatically return to Mode I.Note number of flashes, then immediately turn diagnostic mode selectorto Off position.Turn diagnostic mode selector on ECU to On position and wait untilinspection lamps flash. ![]() On Pathfinder, Pickup and Van models, proceed as follows:
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