P1627

Steps 1 - 4:

DTC P1627 PCM A/D (Analog/Digital) Conversion Malfunction




Circuit Description
The Powertrain Control Module (PCM) monitors the 5 volt reference signal when the Ignition is ON. It the PCM senses an Analog to Digital (ND) conversion error within the PCM, then DTC P1627 will set. DTC P1627 is a type A code.

Conditions for Setting the DTC
- Engine is running.
- Any AID DTC's set.

Action Taken When the DTC Sets
- The PCM will illuminate the Malfunction Indicator Lamp (MIL) the first time the fault is detected.
- The PCM will store the conditions that were present when the DTC was set as Freeze Frame and in Failure Records.

Conditions for Clearing the MIL/DTC
- The PCM will turn OFF the MIL on the third consecutive trip without a reported failure.
- A History DTC will clear after 40 consecutive trips without a reported failure.
The DTC can be cleared using the Scan Tool's "Clear Info" function.

Diagnostic Aids
- Poor connections, or a damaged harness - Inspect the harness connectors for: backed-out terminals, improper mating or damaged terminals. Also, check for open circuits, shorts to ground, and shorts to voltage.