Advanced Diagnostics

Advanced Diagnostics - DTC P16E2: PGM-FI-ACG LIN Communication Error (Engine Type: R18Z1, R18A9)

General Description






The local interconnect network (LIN) line connects the alternator and the engine control module (ECM)/powertrain control module (PCM). The LIN uses a master/slave protocol to send and receive data to the different components on the line.
The ECM/PCM is the master unit, which controls the engine electrical system. The battery sensor unit and the alternator are the slaves. The alternator receives data from the ECM/PCM and provides feedback to the ECM/PCM, which allows the ECM/ PCM to operate the engine electrical system efficiently. When the ECM/PCM does not receive signals from the alternator within its specified amount of time, the ECM/PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
Either one of the conditions is met for at least 5 seconds:
- The ECM/PCM cannot receive any information via the LIN line.
- The information sent from the alternator is abnormal.

Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

- Alternator failure
- Alternator LIN line open
- Alternator LIN line short
- ECM/PCM internal circuit failure

Diagnosis Details

Conditions for setting the DTC
When a malfunction is detected, a Pending DTC, a Confirmed DTC, and the freeze data are stored in the ECM/PCM memory. The MIL does not come on.

Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.