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providing the vehicle has been operating for at least the shortest time period, the ECM will reduce the voltage regulator to the minimum setting of 13.6 volts. Vehicles fitted with 3.5L or 4.2L engine (SC1 generator) The battery charging voltage is determined by the temperature of the generator. In cold conditions, starting the vehicle from cold the battery voltage will be between 14.2 volts and 15.1 volts and will reduce as the engine warms up. In hot conditions starting the vehicle when the engine is already warm the battery voltage will be between 13.5 volts and 14.3 volts.
A fault in the wiring or the connections from the generator to the ECM, will cause a fault code to be generated and stored in the ECM and the charge warning indicator lamp to be displayed in the instrument cluster after a short time.
With the ignition switch in the RUN position the charge warning lamp will be displayed in the instrument cluster when the generator is not generating power.
If a fault is detected with the generator a fault code will be generated and stored by the ECM. The charge warning indicator lamp will also be displayed in the instrument cluster. Units should be repaired as an assembly and not dismantled for repair. For additional information, refer to Generator (414-02)
Vehicles fitted with 2.7L Diesel engine (SC2 generator) All vehicles use a PCM (Pulse Control Modulated) generator. This allows the output voltage to be controlled between 12.5 volts and 16 volts via a signal from the ECM.
This voltage is controlled between 13.5 volts & 15.5 volts. The system voltage is tailored more closely to the demands of the battery. At low ambient temperatures (as measured by the air conditioning ambient air sensor), the charging voltage is higher to improve charge acceptance. At high ambient temperatures the voltage is lower to reduce electrolyte loss and unnecessary battery self-heating. Also built into the strategy, is the ability to measure the battery voltage with the ignition switch in the ON position. A battery with low voltage, with the ignition switch in the ON position, is boost charged at a higher voltage for a calculated time before returning to its 'Base Characteristic' (defined by the prevailing ambient temperatures). The time and boost voltage depends upon the temperature and battery voltage with the ignition switch in the ON position.
All vehicles have a one way clutch fitted to the drive pulley, which reduces belt slip.
A fault in the wiring or the connections from the generator to the ECM, will cause a fault code to be generated and stored in the ECM and the charge warning indicator lamp to be displayed in the instrument cluster after a short time.
With the ignition switch in the RUN position the charge warning lamp will be displayed in the instrument cluster when the generator is not generating power.
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