Power Unit Harness Check
WARNING: This page is about a different car, the 1985 Nissan Maxima and 1985 Nissan 200SX. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect connector between power unit and display unit. Connect AC/DC voltmeter probes to Blue connector of diagnostic jumper lead with positive (+) probe to Red harness side and negative (-) probe to Black harness side. See Fig 1 .
- Install check terminals (two 1-pin terminals) of jumper lead into terminals of power unit. Turn ignition switch to "ON" position. Check voltage at each terminals as follows:
- Using DC voltmeter, measure voltage between terminal VDL (Red) and GND (Black). See Fig 2 . Reading should be 12 volts. This reading is for tachometer and boost gauge.
- Using a DC voltmeter, measure voltage between terminal VDD (Red) and GND (Black). Reading should be 5 volts. This reading is for display unit. Measure voltage between terminal VCC (Red) and GND (Black). Reading should be 5 volts. This reading is for odometer.
- Using a DC voltmeter, measure voltage between terminal GND (Red) and VDM (Black). Reading should be approximately 19 volts. This reading is for speedometer, multiple gauge and trip meter.
- Using an AC voltmeter, measure voltage between terminal F1 (Red) and F1 (Black). Reading should be about 3 volts (AC). This reading is for speedometer.
- Using an AC voltmeter, measure voltage between terminal F2 (Red) and F2 (Black). Reading should be approximately 3 volts (AC). This reading is for fuel gauge and voltmeter.
- Using an AC voltmeter, measure voltage between terminal F3 (Red) and F3 (Black). Reading should be approximately 3 volts (AC). This reading is for water temperature and oil pressure gauges.
- Using an AC voltmeter, measure voltage between terminal F4 (Red) and F4 (Black). Reading should be approximately 3 volts (AC). This reading is for trip meter.