In EURO4 diesel engine with CPF, injection is devided into 2 pilot, 1 main, 2 post injections. Among these injections, pilot and main injections are for the operation of engine, however post injections are for CPF regeneration. Only in activating condition of CPF regeneration during driving, post injection starts. 1st post injection happens at the end of combustion cycle then, injected fuel is used to raise exhaust temperature. that temp. is sensed at T3 exhaust tempt. sensor which is ahead of Turbo charger. 2nd post injection happens at exhaust cycle then, injected fuel is also used to raise exhaust temperature. that temp. is sensed T5 exhaust tempt. sensor which is between Oxydation catalyst and CPF. The reason of raising exhaust tempt. is because exhaust tempt. in diesel engine is too low for CPF regeneration. The optimum tempt. for CPF regeneration is 550~600℃ thus, the goal of post injection is raise exhaust tempt. to that range of tempt.. However if exhaust tempt. is too high, turbo charger or CPF are likely to be damaged. Therefore if tempt. measured at each sensor is out of permittable value(specification), ECM deactivates CPF regeneration.
P2030 is set when the temperature difference between front Exhaust temp. sensor(T3) and rear Exhaust temp. sensor(T5) is above 40℃ at cold idle.
This code is set to prevent CPF from damaging due to inaccurate sensing of exhaust gas temp.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy | ● Voltage monitoring | ● Exhaust Gas temp. sensor circuit ● Exhaust Gas temp. sensor component | ||
Enable Conditions | ● IG KEY "ON" | |||
Threshold Value | ● | front Exhaust temp.- rear Exhaust temp. | is above 40℃ at cold idle. | |||
Diagnostic Time | ● 1 sec. | |||
Fail Safe | Fuel cut | NO | ||
EGR Off | NO | |||
Fuel Limit | NO | |||
Check Lamp | NO | |||
※ At IG KEY ON state and as soon as turning engine ON, the difference of output voltage between EGTS(T3-VGT) and EGTS(T5-CPF) must be small to be neglectable.
Temp. (℃) | Nominal (kΩ) | NEW | AGED | ||
Min(kΩ) | Max(kΩ) | Min(kΩ) | Max(kΩ) | ||
100 | 371 | 289 | 481 | 272 | 515 |
300 | 5.92 | 5.3 | 6.61 | 5.15 | 6.79 |
600 | 0.363 | 0.347 | 0.379 | 0.341 | 0.386 |
900 | 0.0893 | 0.0842 | 0.0949 | 0.0833 | 0.096 |
Connect Scantool to Data Link Connector (DLC).
Monitoring should be performed at cold idle.
Turn "OFF" electrical devices and A/C.
IG KEY "ON"
Monitor "E/GAS TEMP. PRE VGT","E/GAS TEMP. PRE CPF" parameter on the Scantool.
Specification : The difference between "E/GAS TEMP. PRE VGT" and "E/GAS TEMP. PRE CPF" is below 40℃
※ At IG KEY ON state and as soon as turning engine ON, the difference of output voltage between "E/GAS TEMP. PRE VGT" and "E/GAS TEMP. PRE CPF" must be small to be neglectable.
Electrical systems consist of a lot of harness and connectors, poor connection of terminals can cause various problems and damge of component.
Perform checking procedure as follows.
Check damage of harness and terminals : Check terminals for contact resistance, corrosion and deformation.
Check connecting condition of ECM and component connector : Check terminal seperation, damage of locking device and connecting condition between terminal and wiring.
Disconnect the pin which requires checking at male connector and insert it to the terminal at female connector for checking connecting condition. ( after checking, reconnect the pin at correct position. )
Is the problem found?
▶ Repair the trouble causing part and go to "Verification of Vehicle Repair".
▶ Go to "Signal Circuit Inspection".
EGTS(T3-VGT) circuit inspection
Refer to "Signal Circuit Inspection" of "P0545" DTC guide.
EGTS(T5-CPF) circuit inspection
Refer to "Signal Circuit Inspection" of "P2032" DTC guide.
EGTS(T3-VGT) circuit inspection
Refer to "Ground Circuit Inspection" of "P0545" DTC guide.
EGTS(T5-CPF) circuit inspection
Refer to "Ground Circuit Inspection" of "P2032" DTC guide.
EGTS(T3-VGT) circuit inspection
Refer to "Component Inspection" of "P0545" DTC guide.
EGTS(T5-CPF) circuit inspection
Refer to "Component Inspection" of "P2032" DTC guide.
After a repair, it is essential to verify that the fault is corrected.
After connecting Scantool select "DIAGNOSTIC TROUBLE CODES(DTCs)" mode.
Clear recorded DTC using Scantool.
Drive the vehicle within DTC "Enable conditions" in "General information".
After selecting "DIAGNOSTIC TROUBLE CODES(DTCs)" mode and check if DTC is recorded again.
Are any DTCs recorded ?
▶ Go to the DTC guide of recorded NO. in Scantool.
▶ System operates within specification.
