Charging System

-
PINPOINT TEST 1: DTCs B1317, B1676 AND/OR P0563 - BATTERY/SYSTEM VOLTAGE HIGH 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 the various vehicle systems and modules. Many modules monitor this voltage and if it rises above a calibrated set point, a DTC will be set.

- DTC B1317 (Battery Voltage High) - each module within the vehicle system monitors input voltage to the module. If the voltage rises above the module's calibrated set-point (which varies by module), that module will set this DTC. This DTC may also be in memory as a Continuous Memory Diagnostic Trouble Code (CMDTC) if the vehicle has been recently jump started or has had a discharged battery.
- 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 in memory as a CMDTC if the vehicle has been recently jump started or has had a discharged battery.
- DTC P0563 (System Voltage High) - if the module detects a voltage from the charging system higher than 15.2 volts this DTC will be set. This DTC will not be set in the PCM unless the vehicle speed is above 8 km/h (5 mph).

Possible Causes
- Fuse
- Wiring, terminals or connectors
- Engine, generator and battery grounds
- Battery
- Generator
- PCM

Diagnostic Procedure

NOTE:DTC B1317 or DTC 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 and during this pinpoint test.
NOTE:Do not have a battery charger attached during vehicle testing.

Step 1-Step 3:

Step 4-Step 7:

Step 8-Step 10: