DTC P203A:11, P203A:12 [MZR-CD 2.2]SM2444376
DTC P203A:11, P203A:12 [MZR-CD 2.2]

id0102f3163700

DTC P203A:11

DTC P203A:12

Urea level sensor control circuit malfunction (short to ground/short to power supply)
DETECTION CONDITION
• The SCR control unit monitors the input signal from the urea level sensor when the ignition is switched ON. the SCR control unit determines that there is a malfunction in the urea level sensor circuit.
Monitoring condition
― Following conditions are met:
• Battery voltage: 8—16 V
Diagnostic support note
• The MIL/SCR warning light illuminates 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 level sensor malfunction
• Centralized connector or terminal malfunction
• Short to power supply in wiring harness between urea level sensor/urea temperature sensor short cord terminal E and SCR control unit terminal 90
• Short to ground circuit between urea level sensor/urea temperature sensor short cord terminal F and SCR control unit terminal 10
• Short to ground circuit between urea level sensor/urea temperature sensor short cord terminal G and SCR control unit terminal 12
• Short to ground circuit between urea level sensor/urea temperature sensor short cord terminal I and SCR control unit terminal 11
• SCR control unit connector or terminal malfunction
• SCR control unit malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA (MODE2) OR SNAPSHOT DATA HAVE 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?
• Connect the M-MDS to the DLC-2.
• Clear the DTC from the SCR control unit 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”.
(See INTERMITTENT CONCERN TROUBLESHOOTING [MZR-CD 2.2].)
4
INSPECT CENTRALIZED CONNECTOR FOR POOR CONNECTION
• Switch the ignition off.
• Disconnect the urea level sensor/urea temperature sensor short cord connector (connector with 7 wiring harnesses connected).
• 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 9.
No
Go to the next step.
5
INSPECT UREA LEVEL SENSOR CIRCUIT FOR SHORT TO GROUND
• Switch the ignition off.
• Inspect for continuity between the following terminals:
― Urea level sensor/urea temperature sensor short cord terminal F (wiring harness-side) and body ground.
― Urea level sensor/urea temperature sensor short cord terminal G (wiring harness-side) and body ground.
― Urea level sensor/urea temperature sensor short cord terminal I (wiring harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace the malfunctioning wiring harness, then go to Step 9.
No
Go to the next step.
6
INSPECT UREA LEVEL SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY
• Switch the ignition ON (Engine off).
• Measure the voltage between urea level sensor/urea temperature sensor short cord terminal E (wiring harness-side) and body ground.
• Is the voltage B+?
Yes
Repair or replace the malfunctioning wiring harness, then go to Step 9.
No
Go to the next step.
7
INSPECT THE UREA LEVEL SENSOR
• Inspect the urea level sensor. (See UREA LEVEL SENSOR INSPECTION [MZR-CD 2.2].)
• Is there any malfunction?
Yes
Replace the urea pump, urea tank component then go to Step 9.
(See UREA TANK REMOVAL/INSTALLATION [MZR-CD 2.2].)
No
Go to the next step.
8
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 9.
No
Go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P203A:11/P203A:12 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 5 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.
(See SCR CONTROL UNIT REMOVAL/INSTALLATION [MZR-CD 2.2].)
No
Go to the next step.
10
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.