Nissan Optical Distributor Test
Contents
1. Supporting Today s Professional Technician Ss s i se a iT ee aa Ah a ee M lt iii 1h ah i Mi 7 u Ve h j i aa i IT is itty on al nny WT 4 ITU iaai i I J F I N My ie A i IEJ A i radi i i IEEE f z ma i AUTA Y E ny we iil AATA T f a F d AUT J ERARI Sa iuas AI Taa l MNI chi ay Saa aa i thy i _ Taar WT f i va a i i ae i mh Ii d ok WY R W i k i a 1 hit p AAAA Ti de ii f E u a My i A 1 L 5 g S K oe 2 Nissan Optical Distributor Test Application Most Nissan vehicles 1984 amp newer equipped with optical disc sensor distributors Problem Engine turns over but does not start Solution Many Nissan vehicles have a power transistor controlling the coil or igniter The power transistor is a separate unit on optical distributors It allows the signal sent from the ECU low current to activate the primary circuit in the ignition coil higher current This induces high voltage in the secondary windings of the coil providing spark to the distributor cap and plugs If this transistor is faulty the necessary spark will not result The distributor is often blamed for this but before replacing it perform the test steps below Tests before replacement Test power transistor amp coil Refer to service manual for specific test procedures Check ECC fuse and or fusible link at fusebox Check ECC relay typ2. ically a black white wire for 12v Check for 12v at distributor typically an orange wire pin 2 Check continuity of all wiring going to and from computer transistor and distributor To test optical sensor in the distributor remove distributor cap and remove the distributor but leave the harness to the sensor connected Turn ignition switch on DO NOT START ENGINE Rotate distributor shaft slowly by hand and check voltage between terminals 1 black and ground and then between terminal 2 orange and ground Measure voltage on 12v DC scale it should fluctuate between 0 and 5 volts DC oBkON O Camshaft position sensor connector Rotate slow j i aak oe 1 black and ground orange and ground Note 1993 to 1996 Altima 2 41 Cardone part 31 58470 with no start or driveability could be caused by engine oil coating the optical disc or cap terminals Replace PCV valve before installing the distributor For other ProTech publications visit www cardone com CARDONE Industries Inc 5501 Whitaker Ave Philadelphia PA 19124 1799 DS6035 PT 31 0002
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