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Home >> Nissan-Datsun >> 1983 >> Sentra Base, 2D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Diesel >> Testing >> Glow Plug System >> Glow Plug Control Unit
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Glow Plug Control Unit

  1. To test pre-glow operation, connect test lamp to Blue wire of control unit (harness connector plugged in). Turn ignition on and measure amount of time test lamp is lighted. See Pre-Glow Test Specifications table.
    PRE-GLOW TEST SPECIFICATIONS

    Coolant Temp. °F (°C) Time in Seconds Terminal Voltage
    Below 122 (50) 12 8
    Below 122 (50) 6 10.5
    Above 122 (50) 0 0
  2. Connect test lamp to Black/White wire of control unit. Measure amount of time that test lamp is lighted when ignition switch is turned from "START" to "ON". See After-Glow Test Specifications table. Test lamp will be on continuously with switch in "START" position.
    AFTER-GLOW TEST SPECIFICATIONS

    Coolant Temperature °F (°C) Time in Seconds
    Below -13 (-25) 31
    68 (20) 11
    104 (40) 9
    122 (50) 0
  3. Test lamp will turn off during after-glow operation when glow plug voltage reaches 7 volts. Replace glow plug control unit if defective.
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