Generator Monitor

Generator Monitor

Generator Charge Line Monitor (V6 Only)
The generator used with the V6 engine can operate in two output modes. The high charge mode provides an output of 15.3 volts, whilst the low charge mode provides an output of 13.6 volts. This monitor checks the output of the generator to confirm it matches the mode selected. When the entry conditions have been met the rationality of the actual charge mode is compared to the commanded mode, if they do not match then a timer is started. If at the end of the timed period the commanded and actual modes still do not match the relevant DTC is flagged.

Generator Field Line Failure (V6 Only)
Once the entry conditions have been met, the ECM checks the duty cycle of the generator field line against pre-defined thresholds. If the duty cycle is outside the threshold limits for more than a defined period then the field line failure DTC is logged.

Charging System/Generator Load Failure
On V6 engines, this monitor checks the charge line for irrational behavior, these being charge line off when engine running and charge line on when the engine is not running. If either of the above conditions exist for more than a predefined time then the DTC is set and the charge warning lamp is illuminated.

The V8 engine uses an alternative strategy due to differences in the generator used. This generator provides a variable voltage output dependent on the temperature of the generator itself. Once the entry conditions have been satisfied, the average charge voltage over a predefined time is checked. If this falls below a defined threshold value then the DTC is logged and the charge warning lamp is illuminated.