Self diagnosis is performed when the self-diagnosis selector is in the on position. A malfunction is displayed by the red and green LEDs which are located in the control unit. Some malfunctions are stored in the ECU and others are not. S component malfunctions, but may also be poor contact of the connectors, Shorted or open circuit of the harnesses and malfunctions of the transit relays and diodes. For description of modes, proceed as follows: Mode I : with engine stopped, system in bulb check state.The self-diagnostic system determines malfunctions of signals which provide data to the ECU. If ignition is turned Off during diagnosis, in each mode, and then turned back on again after power to the ECU has dropped off completely, diagnosis will automatically return to Mode I. Turn diagnostic mode selector on ECU fully clockwise and wait until inspection lamps flash. Check Engine Light Magically Solved?! Fixing the 300zx (Z32)
300ZX ECU DIAGNOSTICS CODE
For example, if the red diode flashes once and then flashes twice rapidly this should be interpreted as code The codes are displayed in numerical order starting with the lowest and ending with the highest. The codes are interpreted by the number of times and duration the diode flashes. The codes are displayed by the red diode on the ECU. Mode V Real time diagnosis : if a malfunction is present during a driving test, the inspection lamps will display the malfunction condition immediately. The red inspection lamp corresponds to units of 10 the green inspection lamp corresponds to units of one. The green inspection lamp function is the same as in Mode I. 1984-1987 Model Diagnosisĭuring an open loop condition, the red inspection lamp stays off. Mode II Mixture ratio feedback control monitor B : during a closed loop condition, the red inspection lamp turns on and off simultaneously with the green inspection lamp when mixture ratio is controlled within a predetermined value. During an open loop condition, the green inspection lamp stays off. On all models, when ignition is turned Off during diagnosis, in each mode, and then turned back On again after power to the ECU has dropped off completely, diagnosis will automatically return to Mode I.įor description of modes, proceed as follows: Mode I Mixture ratio feedback control monitor A : during a closed loop condition, the green inspection lamp turns on when lean condition is present and goes off when a rich condition is present. Note number of flashes, then immediately turn diagnostic mode selector to Off position. Note number of flashes, then immediately turn diagnostic mode selector fully counterclockwise. Number of flashes displayed indicates corresponding mode. On all models except Pathfinder, Pickup and Van, proceed as follows: Turn diagnostic mode selector on ECU fully clockwise and wait until inspection lamps flash. Learn how your comment data is processed. What does this mean? Your email address will not be published.
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