DTC 73

CIRCUIT DESCRIPTION:
When the engine is stopped, the alternator does not generate electricity, so the voltage at ECU terminal REG is low and DTC 73 is output. While the engine is running with the alternator generating electricity, the voltage at terminal REG becomes high. Thus, the ECU detects the alternator generating condition and controls vehicle height only when the alternator is in generating condition. Code 73 is set when the IC regulator L terminal voltage is less than 1.5 volts (discharge) when the engine is running. Inspect the ECU, IC regulator and the harness/connectors between the ECU and IC regulator.