Entering On-Board Diagnostics (Using Voltmeter)
- Before entering on-board diagnostics, refer to PRETEST INSPECTION . Turn ignition switch to OFF position. Locate self-diagnostic connector. See SELF-DIAGNOSTIC TEST CONNECTOR LOCATION table. Using an analog voltmeter, connect voltmeter positive lead to self-diagnostic connector terminal No. 1 and negative lead to terminal No. 12 (ground). See Fig 1 .
- Turn ignition switch to ON position and disclosure of ECU memory will begin. If 2 or more systems are non-functional, they are indicated by order of increasing code number. Indication is made by 12-volt pulses of voltmeter pointer. A constant repetition of short 12-volt pulses indicates system is normal. If system is abnormal, voltmeter will pulse between zero and 12 volts.
- Signals will appear on voltmeter as long and short 12-volt pulses. Long pulses represent tens; short pulses represent ones. For example 4 long pulses and 3 short pulses indicates Code 43. See Figure . After recording abnormal code(s), perform necessary repair. See DIAGNOSTIC FAULT CHART .
- After repair, turn ignition off and disconnect negative battery cable for 10 seconds to erase ECU memory. Reconnect power supply and repeat self-diagnostics to confirm repair.SELF-DIAGNOSTIC TEST CONNECTOR LOCATION
Application Location 3000GT Under Left Side Of Dash, Next To Fuse Block