DTC P20E8:00 [MZR-CD 2.2]


id0102f3166700

DTC P20E8:00

Urea pump pressure too low

DETECTION CONDITION
•  The SCR control unit monitors urea pump pressure using the urea pump pressure sensor while engine is running. If the urea pump pressure is below 350 kPa {3.57 kgf/cm2, 50.8 psi}, the SCR control unit determines that the urea pump pressure is low.
Monitoring condition
•  Urea pump control: AdBlue® pressure stability control
Diagnostic support note
•  The MIL illuminates if the SCR control unit detects the above malfunction condition in first drive cycle.
•  The SCR warning light flashes if the SCR control unit detects the above malfunction condition in first drive cycle.
•  PENDING CODE is available if the SCR control unit detects the above malfunction condition during the first drive cycle.
•  FREEZE FRAME DATA (mode2) and snapshot data are available.
•  The DTC is stored in the SCR control unit memory.
POSSIBLE CAUSE
•  Insufficient AdBlue® level in urea tank
•  Urea pump malfunction
•  AdBlue® leakage from hose between urea tank and urea injector
•  SCR control unit malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED
•  Have FREEZE FRAME DATA (mode2) or snapshot data been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA (mode2) and snapshot data on the repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform the repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE2)
•  Is DTC P20E8:00 on FREEZE FRAME DATA (mode2)?
Yes
Go to the next step.
No
Go to troubleshooting for DTC on FREEZE FRAME DATA (mode2).
4
VERIFY RELATED PENDING CODE OR STORED DTC
•  Switch the ignition to off, then ON (Engine off).
•  Verify the related PENDING CODE or stored DTCs using the M-MDS.
•  Is the other DTC also present?
Yes
Go to the appropriate DTC troubleshooting procedures.
No
Go to the next step.
5
VERIFY AdBlue® AMOUNT
•  Verify that the AdBlue® amount.
•  Is the AdBlue® amount above the lower limit?
Yes
Go to the next step.
No
Refill the AdBlue® to SCR tank till filled up, then go to Step 8.
6
INSPECT FOR AdBlue® LEAKAGE BETWEEN UREA TANK AND UREA INJECTOR
•  Perform AdBlue® leakage inspection using the M-MDS.
•  Is there any leakage detected?
Yes
Repair or replace malfunctioning part according inspection result, then go to Step 8.
No
Go to the next step.
7
INSPECT WHETHER MALFUNCTION IS IN UREA PUMP OR ELSEWHERE
•  Perform urea pump inspection using the M-MDS.
•  Does the urea pump operate properly?
Yes
Go to the next step.
No
Repair or replace malfunctioning part according inspection result, then go to the next step.
8
VERIFY TROUBLESHOOTING OF DTC P20E8:00 COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the SCR control unit memory using the M-MDS.
•  Drive the vehicle under the FREEZE FRAME DATA (Mode 2) condition.
•  Retrieve the DTC using the M-MDS.
•  Is the PENDING CODE for this DTC present?
Yes
Replace the SCR control unit, then go to the next step.
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.