Note. For circuit reference, see the appropriate WIRING DIAGRAMS article. For connector and terminal identification, see CONNECTOR IDENTIFICATION .
Circuit Description
PCM continuously monitor system voltage. System voltage information is taken from PCM's ignition feed circuits. Since voltages of less than 8 volts or more than 17.1 volts could cause improper system operation and/or component damage, PCM will operate in default mode if DTC is set.
If system voltage is too low, PCM will raise idle speed to increase generator output. If system voltage is too high, PCM disables most outputs to protect hardware. class 2 serial data is shut down when system voltage is less than 9.2 volts or more than 16 volts. Scan tool will display data if system voltage is outside this range. DVOM should be used to monitor system voltage when checking if fault is currently present.
DTC will set when following conditions are present
- Engine running.
- PCM senses system voltage more than 17.1 volts for 5 seconds.
- Conditions met for 6 seconds.