Component Location
General Description
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.
DTC Description
P2033 is set when the Exhaust gas temperature sensor(EGTS) - CPF signal is detected over maximum set temperature(900?),- In case that exhaust gas temperature on the rear side of CPF is abnormally increased -, for more than 1sec. Therefore, check component or vehicle is driven in severe driving condition. or Check that HC gas is flown to catalyst converter at front side of CPF which is resulting from low compression ratio and faulty in/exhaust valve or backleak at injector nozzle.
*. In case that real exhaust gas temperature reaches up to 900?, engine and exhaust line(Turbo charger), CPF can be damaged.
DTC Detecting Condition
Item | Detecting Condition | Possible Cause |
DTC Strategy | Voltage monitoring
| abnormal over-load (driving) condition
Engine misfire
Injector nozzle back leak
Exhaust temp. sensor(T5-CPF) circuit
Exhaust temp. sensor(T5-CPF)component
|
Enable Conditions | IG KEY "ON"
|
Threshold Value | Rear exhaust temperature above 900?
|
Diagnostic Time | 1.0 sec.
|
Fail Safe | Fuel Cut | NO | |
EGR Off | NO |
Fuel Limit | NO |
Check Lamp | BLINK |
Specification
Resistance/Temperature CharacteristicsTemp. (?) | Nominal (k?) | NEW | AGED |
Min(k?) | Max(k?) | Min(k?) | Max(k?) |
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 |
Diagnostic Circuit Diagram
Signal Waveform
Fig.1) Signal waveform when exhaust gas temperature(T5-CPF) shows the higher temperature increases, the lower the voltage decreases.
If the exhaust gas temperature increases up to approx. 600?, output voltage will decreases in 0.3~0.4V