DTC P20E9:71 [MZR-CD 2.2]

DTC P20E9:71	Urea pump pressure too high
DETECTION CONDITION	• The SCR control unit monitors urea pump pressure sensor using the urea pump pressure sensor while the urea injection control is operating. If the urea pump pressure is above 580 kPa {5.91 kgf/cm², 84.1 psi} for 60 sec., the SCR control unit determines that the urea pump pressure 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 malfunction (Excessive feed) • Urea pump pressure sensor malfunction (specific malfunction) • Open or short circuit in wiring harness between urea pump pressure sensor and SCR control unit • Restrict or clogged in urea pump return line • Restrict or clogged in urea return line orifice (in urea tank) • SCR control unit malfunction

DTC P20E9:71

Urea pump pressure too high

DETECTION CONDITION

• The SCR control unit monitors urea pump pressure sensor using the urea pump pressure sensor while the urea injection control is operating. If the urea pump pressure is above 580 kPa {5.91 kgf/cm², 84.1 psi} for 60 sec., the SCR control unit determines that the urea pump pressure 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 malfunction (Excessive feed)

• Urea pump pressure sensor malfunction (specific malfunction)

• Open or short circuit in wiring harness between urea pump pressure sensor and SCR control unit

• Restrict or clogged in urea pump return line

• Restrict or clogged in urea return line orifice (in urea tank)

• SCR control unit malfunction

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 P20E9:71 on FREEZE FRAME DATA (mode2)?	Yes	Go to the next step.
No	Go to troubleshooting for DTC on FREEZE FRAME DATA (mode2). (See DTC TABLE [MZR-CD 2.2].)
4	VERIFY RELATED PENDING CODE OR STORED DTC • Switch the ignition to off, then ON (Engine off). • Verify the PENDING CODE or stored DTCs using the M-MDS. • Is the DTC P20E0:00 or P20E9:73 also present?	Yes	Go to the appropriate DTC troubleshooting procedures. (See DTC TABLE [MZR-CD 2.2].)
No	Go to the next step.
5	INSPECT WHETHER MALFUNCTION IS IN UREA PUMP OR ELSEWHERE • Perform urea pump inspection using the M-MDS. (See SCR SYSTEM INSPECTION [MZR-CD 2.2].) • Is the inspection result normal?	Yes	Go to the next step.
No	Repair or replace malfunctioning part according to inspection result, then go to Step 8.
6	INSPECT WHETHER MALFUNCTION IS IN UREA PUMP PRESSURE SENSOR OR ELSEWHERE • Access the SCR control unit PID LINE_PRESS using the M-MDS. • Start the engine and warm it up to normal operating temperature. • Stop the engine. • Switch the ignition ON (Engine off). • Monitor the PID LINE_PRESS. • Is the monitoring value approx. 0 Pa?	Yes	Go to the next step.
No	Inspect the wiring harness between urea pump pressure sensor and SCR control unit for open and/or short. • If the open or short circuit is detected, repair or replace malfunctioning part. • If the wiring harnesses are normal, replace the urea pump. (Urea pump pressure sensor-specific malfunction) (See UREA PUMP REMOVAL/INSTALLATION [MZR-CD 2.2].) Then go to Step 8.
7	INSPECT WHETHER MALFUNCTION IS IN UREA HOSE OR UREA PUMP RETURN LINE • Perform urea pump inspection without urea hose using the M-MDS. (See SCR SYSTEM INSPECTION [MZR-CD 2.2].) • Is the inspection result normal?	Yes	Go to the next step.
No	Replace the urea pump, then go to the next step. (Urea pump return line or return line orifice (in urea tank) clogging) (See UREA PUMP REMOVAL/INSTALLATION [MZR-CD 2.2].)
8	VERIFY TROUBLESHOOTING OF DTC P20E9:71 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 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. (See SCR CONTROL UNIT REMOVAL/INSTALLATION [MZR-CD 2.2].)
No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZR-CD 2.2].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD 2.2].)
No	DTC troubleshooting completed.

STEP

INSPECTION

ACTION

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.

Record the FREEZE FRAME DATA (mode2) and snapshot data on the repair order, then go to the next step.

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.

Go to the next step.

IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE2)

• Is DTC P20E9:71 on FREEZE FRAME DATA (mode2)?

Yes

Go to the next step.

Go to troubleshooting for DTC on FREEZE FRAME DATA (mode2).

(See DTC TABLE [MZR-CD 2.2].)

VERIFY RELATED PENDING CODE OR STORED DTC

• Switch the ignition to off, then ON (Engine off).

• Verify the PENDING CODE or stored DTCs using the M-MDS.

• Is the DTC P20E0:00 or P20E9:73 also present?

Yes

Go to the appropriate DTC troubleshooting procedures.

(See DTC TABLE [MZR-CD 2.2].)

Go to the next step.

INSPECT WHETHER MALFUNCTION IS IN UREA PUMP OR ELSEWHERE

• Perform urea pump inspection using the M-MDS. (See SCR SYSTEM INSPECTION [MZR-CD 2.2].)

• Is the inspection result normal?

Yes

Go to the next step.

Repair or replace malfunctioning part according to inspection result, then go to Step 8.

INSPECT WHETHER MALFUNCTION IS IN UREA PUMP PRESSURE SENSOR OR ELSEWHERE

• Access the SCR control unit PID LINE_PRESS using the M-MDS.

• Start the engine and warm it up to normal operating temperature.

• Stop the engine.

• Switch the ignition ON (Engine off).

• Monitor the PID LINE_PRESS.

• Is the monitoring value approx. 0 Pa?

Yes

Go to the next step.

Inspect the wiring harness between urea pump pressure sensor and SCR control unit for open and/or short.

• If the open or short circuit is detected, repair or replace malfunctioning part.

• If the wiring harnesses are normal, replace the urea pump.

(Urea pump pressure sensor-specific malfunction)

(See UREA PUMP REMOVAL/INSTALLATION [MZR-CD 2.2].)

Then go to Step 8.

INSPECT WHETHER MALFUNCTION IS IN UREA HOSE OR UREA PUMP RETURN LINE

• Perform urea pump inspection without urea hose using the M-MDS. (See SCR SYSTEM INSPECTION [MZR-CD 2.2].)

• Is the inspection result normal?

Yes

Go to the next step.

Replace the urea pump, then go to the next step.

(Urea pump return line or return line orifice (in urea tank) clogging)

(See UREA PUMP REMOVAL/INSTALLATION [MZR-CD 2.2].)

VERIFY TROUBLESHOOTING OF DTC P20E9:71 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 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.

(See SCR CONTROL UNIT REMOVAL/INSTALLATION [MZR-CD 2.2].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZR-CD 2.2].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZR-CD 2.2].)

DTC troubleshooting completed.