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 DTC P1281 [MZR-CD (RF Turbo)]

DTC P1281 [MZR-CD (RF Turbo)]

id0102f1117500

DTC P1281

Common rail pressure higher than desired (engine running)

DETECTION CONDITION

• PCM monitors common rail pressure using the fuel pressure sensor built in the common rail when the engine speed more than 500 rpm. The actual fuel pressure is higher than 230 MPa {2,345 kgf/cm2, 33,350 psi} or calculated pressure based on engine speed, the PCM determines that the common rail pressure higher then desired value.
Diagnostic support note
• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction conditions during first drive cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Suction control valve malfunction
• Fuel pressure limiter malfunction
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has 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
• Check for related service repair information availability?
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
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is DTC P1281 on FREEZE FRAME DATA?
Yes
Go to the next step.
No
Go to troubleshooting procedures for DTC in FREEZE FRAME DATA.
4
VERIFY FUEL PRESSURE AT COMMON RAIL
• Access FRP PID.
• Start the engine.
• Does the FRP PID indicate below fuel pressure limiter opening pressure?
Yes
Go to the next step.
No
Replace the common rail, then go to Step 6.
5
INSPECT SUCTION CONTROL VALVE
• Inspect the suction control valve.
• Is the suction control valve normal?
Yes
Go to the next step.
No
Replace the supply pump, then go to the next step.
6
VERIFY TROUBLESHOOTING OF DTC P1281 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Turn the engine switch to ON position (engine off).
• Clear the DTC from PCM memory using the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
Yes
Replace the PCM, go to the next step.
No
Go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
• Perform "AFTER REPAIR PROCEDURE".
• Is any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.