P0606

PCM Internal Communication Interrupted:

Power and Ground Check:

Circuit Description

The PCM has two internal processors: the E and the T side. They are connected together and share data on an interconnect called the SPI. The E side sends sensor data to the T side. This sensor data is checked and if the difference in readings between the two processors is too great, DTC P0606 will set.


Conditions for Setting the DTC

Test Conditions

^ Valid SPI data is being received.

^ Ignition voltage is greater than 10 volts.

^ Ignition on for 5 seconds.

Failure Condition

^ Manifold Absolute Pressure (MAP), Engine Coolant Temperature (ECT) sensor or Throttle Position (TP) sensor data varies between E side and T side.


Action Taken When the DTC Sets

^ The PCM will illuminate the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.

^ The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records.


Conditions for Clearing the MIL/DTC

^ The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.

^ A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.

^ A History DTC will clear after forty consecutive warm-up cycles with no failures of any emission related diagnostic test.

^ PCM battery voltage is interrupted.

^ Using a Scan tool.


Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

2. This DTC indicates an internal PCM problem.