ECM is activated by power supply. Signals from several sensors, such as CKPS and APS, is inputted to ECM. Comparing inputted siganals with control LOGIC saved at micro controller and EEPROM, ECM controlls engine as actuating injectors, solenoids and relays.
To guarantee accurate control, ECM performs SELF TEST, DIAGNOSIS of several sensors and actuators. And if serious trouble which affects vehicle performance occurrs, ECM sets DTCs.
At certain cases, ECM shuts down whole systems in order to prevent dangerous situation due to incorrect control.
P0606 is set when 1) writing/reading error inside of ECM occur. 2) error of APS 2 ground checking which is repeated every 0.2 sec. or 3) the voltage of sensor power supply 1 and 2 ( the standard voltage of A/D converter) are below 4.7V or above 5.1V. This code is due to ECM internal failure.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Signal monitoring |
•
ECM component failure | ||
Enable Conditions |
•
IG KEY "ON" | |||
Threshold Value |
•
Writing/reading error inside of ECM
•
APS 2 ground checking error
•
APS 2 ground checking error | |||
Diagnostic Time |
•
Immediately | |||
Fail Safe | Fuel cut | YES | ||
EGR Off | NO | |||
Fuel Limit | NO | |||
MIL | YES | |||
Fig.1) Ground checking signal of APS 2 signal is for ECM to monitor APS 2. This signal drops APS 2 output voltage to below 200.39mV every 200msec. If APS 2 output voltage does not drop to below 200.39mV, ECM sets DTC as recognizing ground circuit error of APS 2.
※ The waveform below 200.39mV is not detectable in ground checking signal waveform of APS 2 signal. Instead, the waveform which drops a little is detected. If APS 2 data of "SERVICE DATA" on the Scantool varies from 350mV to 0mV periodically, it means it works normally.
