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ALTERNATOR & REGULATOR - HITACHI
1993 Nissan Sentra
1993 ELECTRICAL Nissan Alternators & Regulators - Hitachi Altima, Maxima, NX, Pathfinder, Pickup, Sentra, 240SX, 300ZX NOTE: If vehicle is equipped with Mitsubishi alternator, see ALTERNATOR & REGULATOR - MITSUBISHI article in the ELECTRICAL section.
DESCRIPTION
Conventional 3-phase, self-rectifying Hitachi alternator contains 3 positive and 3 negative diodes that rectify current. See Fig. 3. Regulator is inside alternator.
ADJUSTMENTS BELT TENSION
ALTERNATOR BELT ADJUSTMENT Application
Altima ............................................... .24-.28 (6-7) Maxima (2) VE30DE ......................................... .29-.33 (7.5-8.5) VG30E .............................................. .28-.35 (7-9) NX & Sentra 1.6L ............................................... .28-.35 (7-9) 2.0L (With A/C) .................................... .28-.31 (7-8) 2.0L (Without A/C) ................................. .31-.35 (8-9) Pathfinder & Pickup 2.4L ............................................. .39-.47 (10-12) 3.0L ............................................... .24-.31 (6-8) 240SX ................................................ .28-.31 (7-8) 300ZX ................................................ .28-.31 (7-8) (1) - Deflection is with 22 lbs. (10 kg) pressure applied midway on the longest belt run. (2) - Vehicles with VE30DE engine use a distributorless ignition system. Vehicles with VG30E engine use a distributor.
NOTE:
NOTE:
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TROUBLE SHOOTING
See TROUBLE SHOOTING - BASIC PROCEDURES article in GENERAL INFORMATION section.
(1) Deflection In. (mm)
ON-VEHICLE TESTING
Before testing, ensure alternator wire harness connections are secure, drive belt tension is okay and battery is fully charged. After starting engine, wait at least 30 seconds before measuring voltage. Terminals "S", "L", "B", and "E" are marked on alternator's rear cover. Terminal "F" is inside alternator.
Alternator Test 1) Turn ignition on. If charge indicator light on instrument panel comes on, go to step 3). If light is off, disconnect alternator connector (terminals "L" and "S"). Ground terminal "L". If light remains off, replace indicator bulb, reconnect alternator connector and recheck. 2) If light comes on, reconnect alternator connector. Fullfield alternator by grounding internal terminal "F" with a wire. See Fig. 1. If light goes out, repair or replace alternator. If light is on, replace regulator. 3) Start and run engine at idle. If light is dim, flickers or remains on (bright), repair or replace alternator. If light goes out, operate engine at 1500 RPM and turn on headlights. If light comes on, replace regulator. 4) If light stays off, measure voltage at terminal "B" while running engine at 1500 RPM. If more than 15.5 volts are present, replace regulator. If 13-15 volts are present, alternator and regulator are okay. Ensure alternator output amperage is as specified. See HITACHI ALTERNATOR OUTPUT AMPERAGE SPECIFICATIONS table. HITACHI ALTERNATOR OUTPUT AMPERAGE SPECIFICATIONS Application
Altima ..................... Maxima (1) VE30DE ................... VG30E .................... NX & Sentra 1.6L ..................... 2.0L ..................... Pathfinder & Pickup 2.4L ..................... 3.0L ..................... 240SX ...................... 300ZX ......................
(1) - Vehicles with VE30DE engine use a distributorless ignition system. Vehicles with VG30E engine use a distributor.
Fig. 1: Full-Fielding Hitachi Alternator Courtesy of Nissan Motor Co., U.S.A.
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Amps @ 2500 RPM 66 80 63 50 63 48 50 63 65 ..................... ..................... ..................... ..................... ..................... ..................... ..................... ..................... .....................
Amps @ 5000 RPM 77 91 84 67 77 57 67 77 80
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BENCH TESTING
Rotor Connect one ohmmeter lead to each rotor slip ring. If resistance is about 2-3 ohms, rotor is okay. If about 2-3 ohms resistance is not present, rotor is defective. Connect an ohmmeter lead to any rotor slip ring, and connect remaining lead to rotor core. If continuity exists, replace rotor assembly. MINIMUM SLIP RING DIAMETER Application
Maxima & 300ZX .................................. 1.0 (26) All Others .................................... 1.2 (30.5) NOTE:
Stator Using ohmmeter, check continuity between stator core leads. If continuity is not present between leads, replace stator. Connect an ohmmeter lead to stator core. Connect remaining ohmmeter lead, in turn, to each of the stator leads. If continuity is not present, stator is good. If continuity exists, stator is grounded. Replace stator. Diodes Using an ohmmeter, check continuity of all diodes in both directions. Ensure continuity exists in only one direction. See ALTERNATOR DIODES TEST table. See Fig. 2. If continuity exists in both directions, diode is shorted. If continuity is not present in either direction, diode is open. If any diode is defective, replace entire diode assembly. ALTERNATOR DIODES TEST Positive Meter Lead (+) Diode Plate Diode Terminals (-) Diode Plate Diode Terminals
Fig. 2: Testing Diode Assembly Courtesy of Nissan Motor Co., U.S.A.
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Negative Meter Lead Diode Terminals (+) Diode Plate Diode Terminals (-) Diode Plate ........ ........ ........ ........
In. (mm)
To test stator or diodes, separate them by unsoldering connecting wires. Use just enough heat to melt solder. Excess heat will damage diodes.
Continuity
........... Yes ............ No ............ No ........... Yes
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Brushes Inspect brushes for freedom of movement in holder. Clean brush holder if necessary. Check brushes for cracks and wear. Check brush springs for corrosion or damage. Ensure brushes are not worn beyond minimum length. See MINIMUM BRUSH LENGTH table. MINIMUM BRUSH LENGTH Application
Maxima With Distributor & 300ZX .................. All Others .......................................
NOTE:
Fig. 3: Exploded View Of Typical Hitachi Alternator Courtesy of Nissan Motor Co., U.S.A.
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OVERHAUL WIRING DIAGRAMS
In. (mm) .28 (7) .24 (6)
A ring is used to lock outer bearing race in alternator's rear cover. It may be necessary to heat bearing housing to remove cover. Use a 200-watt soldering iron to heat housing. DO NOT use heat gun as it may damage diode. For exploded view of alternator, see Fig. 3.
Proceed to appropriate WIRING DIAGRAM article listed below in WIRING DIAGRAMS section. * * * * * * * * WIRING WIRING WIRING WIRING WIRING WIRING WIRING WIRING DIAGRAMS DIAGRAMS DIAGRAMS DIAGRAMS DIAGRAMS DIAGRAMS DIAGRAMS DIAGRAMS (for (for (for (for (for (for (for (for Altima). Maxima). NX). Pathfinder). Pickup). Sentra). 240SX). 300ZX).