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.
P0652 is set when the voltage below 4700mV - minimum voltage of sensor power supply 2 generates from ECM - is detected for more than 0.1 sec.. This code is due to the short to ground in sensor power circuit or the voltage problem inside of ECM.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy | ● Voltage monitoring | ● RPS power supply circuit ● APS 2 power supply circuit ● BPS power supply circuit ● ECM component | ||
Enable Conditions | ● IG KEY "ON" | |||
Threshold Value | ● When the voltage is below the minimum voltage of sensor power supply.( below 4700mV ) | |||
Diagnostic Time | ● 100ms | |||
Fail Safe | Fuel Cut | NO | ● Limp home mode is activated(engine speed is fixed at 1200RPM. ) | |
EGR Off | NO | |||
Fuel Limit | YES | |||
MIL | NO | |||
Sensor power 1 | Sensor power 2 | Sensor power 3 |
APS 1 | RPS, APS 2,BPS | A/C pressure transducer, Differntil pressure sensor, VSA position Sensor |
4830mV~5158mV | 4830mV~5158mV | 4830mV~5158mV |
