DTC P20E0:00 [MZR-CD 2.2]


id0102f3166500

DTC P20E0:00

Urea pump pressure sensor circuit high

DETECTION CONDITION
•  The SCR control unit monitors input voltage from urea pump pressure sensor while the engine switch is on. If the input voltage is above 3.0 V for 2 sec., the SCR control unit determines that the urea pump pressure sensor circuit voltage is high.
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
•  Urea pump pressure sensor short cord connector or terminal malfunction
•  SCR control unit connector or terminal malfunction
•  Short to power supply in wiring harness between urea pump pressure sensor terminal 1 and SCR control unit terminal 26
•  Short to power supply in wiring harness between urea pump pressure sensor terminal 2 and SCR control unit terminal 60
•  Open circuit in wiring harness between urea pump pressure sensor terminal 3 and SCR control unit terminal 81
•  Urea pump pressure sensor connector or terminal malfunction
•  Urea pump pressure sensor malfunction
•  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
VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine.
•  Is the PENDING CODE for this DTC present?
Yes
Go to the next step.
No
Intermittent concern exists.
Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”.
4
INSPECT UREA PUMP PRESSURE SENSOR SHORT CORD CONNECTOR FOR POOR CONNECTION
•  Switch the ignition off.
•  Disconnect the urea pump pressure sensor short cord connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 13.
No
Go to the next step.
5
INSPECT SCR CONTROL UNIT CONNECTOR FOR POOR CONNECTION
•  Switch the ignition off.
•  Disconnect the SCR control unit connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 13.
No
Go to the next step.
6
INSPECT UREA PUMP PRESSURE SENSOR SIGNAL CIRCUIT AND POWER SUPPLY CIRCUITS FOR SHORT TO EACH OTHER
•  Urea pump pressure sensor short cord and SCR control unit connectors are disconnected.
•  Switch the ignition off.
•  Inspect for continuity between urea pump pressure sensor short cord terminals C and D (SCR control unit-side).
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 13.
No
Go to the next step.
7
INSPECT UREA PUMP PRESSURE SENSOR SIGNAL OR POWER CIRCUIT FOR SHORT TO POWER
•  Urea pump pressure sensor short cord and SCR control unit connectors are disconnected.
•  Switch the ignition ON (Engine off).
•  Measure the voltage between the following urea pump pressure sensor terminals and body ground.
―  Urea pump pressure sensor short cord terminal C (SCR control unit-side) and body ground
―  Urea pump pressure sensor short cord terminal D (SCR control unit-side) and body ground
•  Is there any voltage?
Yes
Repair or replace the wiring harness for a short to power, then go to Step 13.
No
Go to the next step.
8
INSPECT UREA PUMP PRESSURE SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
•  Urea pump pressure sensor short cord and SCR control unit connectors are disconnected.
•  Switch the ignition off.
•  Inspect for continuity between urea pump pressure sensor short cord terminal E (SCR control unit-side) and SCR control unit terminal 81 (wiring harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for an open circuit, then go to Step 13.
9
INSPECT UREA PUMP PRESSURE SENSOR CONNECTOR FOR POOR CONNECTION
•  Urea pump pressure sensor connector is disconnected.
•  Switch the ignition off.
•  Disconnect the urea pump pressure sensor connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 13.
No
Go to the next step.
10
INSPECT UREA PUMP PRESSURE SENSOR SIGNAL CIRCUIT AND POWER SUPPLY CIRCUITS FOR SHORT TO EACH OTHER
•  Urea pump pressure sensor and short cord connectors are disconnected.
•  Switch the ignition off.
•  Inspect for continuity between urea pump pressure sensor terminals C and D (urea pump pressure sensor-side).
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 13.
No
Go to the next step.
11
INSPECT UREA PUMP PRESSURE SENSOR SIGNAL OR POWER CIRCUIT FOR SHORT TO POWER
•  Urea pump pressure sensor and short cord connectors are disconnected.
•  Switch the ignition ON (Engine off).
•  Measure the voltage between the following urea pump pressure sensor terminals and body ground.
―  Urea pump pressure sensor short cord terminal C (urea pump pressure sensor-side) and body ground
―  Urea pump pressure sensor short cord terminal D (urea pump pressure sensor-side) and body ground
•  Is there any voltage?
Yes
Repair or replace the wiring harness for a short to power, then go to Step 13.
No
Go to the next step.
12
INSPECT UREA PUMP PRESSURE SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
•  Urea pump pressure sensor and short cord connectors are disconnected.
•  Switch the ignition off.
•  Inspect for continuity between urea pump pressure sensor short cord terminal E (urea pump pressure sensor-side) and SCR control unit terminal 3 (wiring harness-side).
•  Is there continuity?
Yes
Replace the urea pump, then go to the next step. (Urea pump pressure sensor malfunction)
No
Repair or replace the wiring harness for an open circuit, then go to the next step.
13
VERIFY TROUBLESHOOTING OF DTC P20E0:00 COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the SCR control unit memory using the M-MDS.
•  Switch the ignition ON for 2 sec.
•  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.
14
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.