DTC Advanced Diagnostics: P0606
DTC P0606:Powertrain Control Module (PCM) Processor Malfunction

General Description
DTC P0606 is stored if the internal failures of the powertrain control module (PCM) are detected:
Knock sensor signal check
The PCM tests to diagnose the evaluation of the knock detection signal from the knock sensor. A knock sensor (piezo-ceramic acceleration sensor) acquires the combustion noise and converts it into electrical signals. The signal is processed in the microcontroller CPU (knock sensor processor) of the PCM. The number of sampled signals, the position and the length of the measuring window are constantly (combustion synchronized) monitored for rationality faults. If these values are abnormal, the PCM detects a malfunction and stores a DTC.

Electrically erasable programmable read-only memory (EEPROM) read/write error
The read and write access to EEPROM is permanently monitored by the EEPROM hardware abstraction layer. If a data block could not be read from or write to the EEPROM, the PCM detects a malfunction and stores a DTC.
Air/fuel ratio (A/F) sensor (sensor 1) driver IC error
The driver IC for A/F sensor (sensor 1) is built into the PCM. The diagnosis data acquired by the driver IC are called up directly by application specific integrated circuit (ASIC) chip and are considered along with the measured values in order to detect faults in the system and the sensor. At the same time, a distinction is made between SPI faults (transmission faults), chip faults (ex. incorrect placement of components or faulty driver IC), short circuits, as well as overloads at the individual pins. If an error occurs at the driver IC, the PCM detects a malfunction and stores a DTC.
Controlled valve operation (CVO) signal not plausible
The monitoring function verifies the calculated adjustment values of the CVO function. In case of an error, error reactions will be activated such as triggering a new base adaptation or locking the defective injector for the CVO. If the CVO signal is not plausible, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous or multiple*
Sequence
None
Duration
Depending on error
DTC Type
Two drive cycles, MIL on
*: Depending on error

Enable Conditions
Knock sensor signal check
Condition
Minimum
Maximum
Engine speed [Engine Speed]
1,000 rpm
–
Other
Condition in steady engine load and engine speed

EEPROM read/write error
Condition
 
Vehicle
ON mode

A/F sensor (sensor 1) driver IC error
Condition
Minimum
Maximum
12 volt battery voltage [Battery]
10.7 V
16.1 V

CVO signal not plausible
Condition
 
State of the engine
Running
[ ]: HDS Parameter

Malfunction Threshold
Knock sensor signal check
Either of the symptoms occurs:
?
The absolute difference of estimated and measured sampled signals in the measuring window is more than 30 at least 100 counts within 400 of observation period.
?
Number of signal evaluation errors (position and length of measuring window) within observation period is greater than 2 counts.
EEPROM read/write error
A data block cannot be read/written or a read order of data blocks is not successfully accomplished at least 3 events.
A/F sensor (sensor 1) driver IC error
Either of the symptoms occurs:
?
A/F sensor (sensor 1) driver IC error in the PCM is detected during transmission of diagnostic register, data register, or RAM data.
?
The driver IC initialization was not successful, slow response, or no values found in diagnosis register.
CVO signal not plausible
Either of the symptoms occurs for at least 100 counts:
?
Measured buffer CVO signal at beginning is more than 15,000.
?
Measured buffer CVO signal at end is less than 5,000.

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.
PCM internal circuit failure

Confirmation Procedure
Operating Condition
1.
Start the engine.
2.
Drive the vehicle at engine speed [Engine Speed] 1,000 rpm or more for at least 1 second.
Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.