DTC P1211 [MZR-CD (RF Turbo)]

BME010201200201

DTC P1211

Fuel pressure higher or lower than desired pressure

DETECTION CONDITION

• The PCM monitors the fuel pressure and calculates the fuel supply volume to the common rail using the fuel pressure sensor input signal while the engine is running. If the fuel pressure or fuel supply volume to the common rail is as follows, the PCM determines that the fuel pressure is higher or lower than the desired pressure.
- Supply pump actual pressure is higher than threshold.
- Difference between two consecutive fuel supply to common rail volume from supply pump is more than one fuel injection volume by fuel injector.
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 condition.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Suction control valve malfunction
• Fuel pressure sensor characteristic malfunction
• Fuel pressure limiter malfunction
• Supply pump 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
• Verify related Service Bulletins and/or on-line 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 CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?
• Connect the WDS or equivalent to the DLC-2.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• 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
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is DTC P0627 on the FREEZE FRAME DATA?
Yes
Go to the next step.
No
Go to the troubleshooting procedures for the DTC in the FREEZE FRAME DATA.
5
INSPECT FUEL PRESSURE SENSOR
• Inspect the fuel pressure sensor.
• Is the fuel pressure sensor normal?
Yes
Go to the next step.
No
Replace the common rail, then go to Step 9.
6
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 Step 9.
7
VERIFY FUEL PRESSURE LIMITER MALFUNCTION
• Replace the common rail.
• Make sure to reconnect all disconnected connectors.
• Clear the DTC using the WDS or equivalent.
• Start the engine.
• Is the PENDING CODE for this DTC present?
Yes
Go to the next step.
No
This DTC cause is fuel pressure limiter malfunction, then go to Step 9.
8
VERIFY SUPPLY PUMP MALFUNCTION
• Replace the supply pump.
• Make sure to reconnect all disconnected connectors.
• Clear the DTC using the WDS or equivalent.
• Start the engine.
• Is the PENDING CODE for this DTC present?
Yes
Go to the next step.
No
The cause for this DTC is a supply pump malfunction, then go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P1211 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC using the WDS or equivalent.
• Start the engine.
• Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
• Perform the Repair Verification Drive Mode.
• Are any DTCs present?
Yes
Go to the applicable DTC troubleshooting.
No
Troubleshooting completed.