DTC Advanced Diagnostics: P16BB (3.0L Engine)
DTC P16BB: Alternator B Terminal Circuit Low Voltage
General Description
Alternator is a generator that is driven by the engine, and generates electricity according to the voltage command from the powertrain control module (PCM). The local interconnect network (LIN) line is connected to the alternator and transmits/receives information to/from the PCM. The PCM sets a target generating voltage in the range of 12.5 V to 14.5 V and commands the alternator via LIN line. If the FI_MAN_RLY_OUT terminal voltage is a set value for a specified duration, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 60 seconds or more |
| DTC Type | One drive cycle, MIL off |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Engine speed [Engine Speed] | 500 rpm | 3, 000 rpm |
| Alternator control voltage | 14.5 V | - |
| Alternator power generation amount | 1 % | 50 % |
| Other | LIN communication is OK | |
[ ]: HDS Parameter
Malfunction Threshold
The FI_MAN_RLY_OUT terminal voltage is 12 V or less for at least 60 seconds.
Possible Cause
- Alternator side ACG_+B terminal disconnection
- Fuse folder A side ACG_+B terminal disconnection
- Alternator internal failure
- PCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, a Pending DTC, a Confirmed DTC, the freeze data, and the on-board snapshot are stored in the PCM memory. The MIL does not come on.
Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.