B1485
DTC B1485
CIRCUIT DESCRIPTION
The engine control module (ECM)/powertrain control module (PCM) controls the generator through the generator L-terminal control circuit. The signal is a 5-volt pulse width modulation (PWM) signal of 128 Hz with a duty cycle of 0-100 percent. Normal duty cycle is between 5-95 percent. If the generator L-terminal control circuit is in the 0-5 percent range, pulled low to ground or open then DTC B1485 will set.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1485 Generator L-Terminal Circuit
This vehicle has DTCs that include DTC symptoms. For more information on DTC symptoms, refer to DTC Symptom Description in Vehicle DTC Information. DTC Symptom Description
CONDITIONS FOR RUNNING THE DTC
- The engine speed is greater than 450 RPM.
- This diagnostic shall be run every 100 milliseconds.
CONDITIONS FOR SETTING THE DTC
B1485 04
Sets as current when the generator L-terminal control circuit is less than or equal to 5 percent duty cycle for more than 120 seconds.
ACTION TAKEN WHEN THE DTC SETS
The ECM/PCM will request the driver information center (DIC) message of Charging System Fault and commands on the Battery indicator.
CONDITIONS FOR CLEARING THE DTC
- The generator L-terminal control circuit input is greater than 5 percent duty cycle.
- Clear the DTC with a scan tool.
DIAGNOSTIC AIDS
Recommended Action:
- Correct L-terminal short low condition.
- Clear the codes.
- Cycle the ignition.
IMPORTANT: You must cycle the ignition after clearing the DTC to turn OFF the DIC message of Service Charging System.
If a fault condition persists, replace the module.
TEST
