Charging System
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PINPOINT TEST 2: DTC B1318 AND/OR B1676 - BATTERY VOLTAGE LOW AND/OR BATTERY PACK VOLTAGE OUT OF RANGE
Normal Operation
With the engine running, the charging system supplies voltage to the battery and the vehicle electrical system through the battery B+ cable. The voltage that is supplied to the vehicle electrical system is used for the operation of vehicle and the various modules. Many modules monitor this voltage and if it drops below a calibrated set-point, a DTC will be set.
- DTC B1318 Battery Voltage Low - Each module within the vehicle system monitors input voltage to the module. If the voltage drops below the module's calibrated set-point (which varies between modules), that module will set this DTC.
- DTC B1676 Battery Pack Voltage Out of Range - Each module within the vehicle system monitors input voltage to the module. If the voltage rises above or drops below the module's calibrated set-point that module will set this DTC. This DTC may also be set if the vehicle has been recently jump started or has had a discharged battery.
Possible Causes
- Circuit high resistance
- Engine, generator and battery grounds
- Positive battery cable
- Battery
- High ignition-off current drain(s)
- Generator
Diagnostic Procedure
NOTE:DTCs B1318 or B1676 can be set if the vehicle has been recently jump started, the battery has been recently charged or the battery has been discharged. The battery may become discharged due to excessive load(s) on the charging system from aftermarket accessories or if vehicle accessories have been operating for an extended period of time without the engine running.
NOTE:Make sure battery voltage is greater than 12.2 volts prior to carrying out this pinpoint test.
NOTE:Do not have a battery charger attached during vehicle testing.
