D21 Hardbody 4WD V6-2960cc 3.0L SOHC MFI (VG30E) (1991)
On some models, a red plastic projection will be lined up with the connector face when the securing bolt is properly torqued. Please refer to illustration.
Caution:
Before connecting or disconnecting the ECU harness connector to or from the ECU, be sure to turn the ignition switch "OFF" and disconnect the
negative battery terminal to avoid damaging the ECU (battery voltage is applied to the ECU even if the ignition switch is "OFF").