Powertrain Management

DTC P0606: Control Module Internal Performance

Circuit Description
The Engine Control Module (ECM) is the control center of the fuel injection system. It constantly looks at the information from various sensors and controls the systems that affect vehicle performance. The ECM also performs the diagnostic function of the system. It can recognize operational problems, alert the driver through the Malfunction Indicator Lamp (MIL)(Check Engine) and store a Diagnostic Trouble Code (DTC) or DTCs which identify the problem areas to aid the technician in making repairs. An Electrically Erasable Programmable Read Only Memory (EEPROM) is used to house the program information and the calibrations required for engine, transmission and powertrain diagnostics operation. The Diagnostic Trouble Code (DTC) will stored, when the ECM detects SPI communication between main CPU and output driver I/C is corrupted.

Conditions for Setting the DTC
^ Ignition switch is turned to ON.
^ Battery voltage is between 7 and 20 V.

Action Taken When the DTC Sets
^ The Malfunction Indicator Lamp (MIL) will illuminate.
^ The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
^ A history DTC is stored.

Conditions for Clearing the MIL/DTC
^ A history DTC will clear after 40 consecutive warm up cycles without a fault.
^ The DTC(s) can be cleared by using the scan tool.
^ Disconnecting the ECM battery feed for more than 10 seconds.

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Troubleshooting