DTC P1181 [MZ-CD 1.6 (Y6) (EURO4 emission level)]

id0102g6835300

DTC P1181

Fuel pressure - too high
DETECTION CONDITION
•  The PCM monitors the fuel pressure in the common rail from the fuel pressure sensor while the engine is running. If the fuel pressure is grater than the maximum fuel pressure which is determined by the engine speed, the PCM determines that the fuel pressure is too high.
POSSIBLE CAUSE
•  Fuel return line clogged
•  Fuel injector relief valve clogged
•  Fuel pressure sensor malfunction
•  Fuel metering valve (built-in supply pump) malfunction
•  Supply pump malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•   Has the FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related service repair information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•   If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
VERIFY RELATED PENDING CODE AND/OR DTC
•  Switch the ignition to off, then to ON (engine off).
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Is the following PENDING CODE/DTC also present?
―  P0191, P0192, P0193, P0201, P0202, P0203, P0204, P0251, P0252, P0253, P0254, P1201, P1202, P1203, P1204, P1551, P1552, P1553, P1554
Yes
Go to the applicable DTC inspection.
(See DTC P0191 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0192 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0193 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0201 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0202 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0203 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0204 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0251 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0252 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0253 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0254 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1201 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1202 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1203 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1204 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1551 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1552 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1553 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1554 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
No
Go to the next step.
4
INSPECT FUEL LINE FOR CLOGGING
•  Switch the ignition to off.
•  Inspect for fuel clogging in the following fuel lines:
―  Fuel injector and fuel return line manifold
―  Fuel return line manifold and fuel tank
•  Is there any malfunction?
Yes
Repair or replace suspect fuel line, then go to Step 7.
No
Go to the next step.
5
INSPECT WHETHER MALFUNCTION IS IN FUEL INJECTOR OR ELSEWHERE
•  Replace the fuel injector with one from another normal vehicle.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Go to the next step.
No
Replace the fuel injector, then go to Step 7.
(See FUEL INJECTOR REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)
6
INSPECT WHETHER MALFUNCTION IS IN FUEL PRESSURE SENSOR OR ELSEWHERE
•  Replace the common rail with one from another normal vehicle.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Go to the next step.
No
Replace the common rail, then go to the next step.
(See COMMON RAIL REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)
7
VERIFY THAT DTC P1181 TROUBLESHOOTING IS COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
•  Perform the after repair procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
No
DTC troubleshooting completed.