DTC P228C:00, P228C:7B [MZ-CD 1.6 (Y6) (EURO5 emission level)]

id0102g7444100

DTC P228C:00

DTC P228C:7B

Fuel pressure regulator exceeded control limits - pressure too low

DETECTION CONDITION

•  If the pressure increase value of the fuel rail pressure exceeds the threshold which is determined based on the engine speed, the PCM determines that the fuel pressure is too low.

POSSIBLE CAUSE

•  Fuel metering valve malfunction

•  Supply pump malfunction

•  Fuel pressure sensor malfunction (built-in common rail)

•  Fuel injector stuck open

•  Leakage in fuel line (High-pressure side, Low-pressure side)

•  Restriction in low-pressure side fuel line

•  Clogged or damaged fuel filter

•  Supply pump adaptive value reset improper

•  PCM malfunction

DTC P228C:00 DTC P228C:7B	Fuel pressure regulator exceeded control limits - pressure too low
DETECTION CONDITION	• If the pressure increase value of the fuel rail pressure exceeds the threshold which is determined based on the engine speed, the PCM determines that the fuel pressure is too low.
POSSIBLE CAUSE	• Fuel metering valve malfunction • Supply pump malfunction • Fuel pressure sensor malfunction (built-in common rail) • Fuel injector stuck open • Leakage in fuel line (High-pressure side, Low-pressure side) • Restriction in low-pressure side fuel line • Clogged or damaged fuel filter • Supply pump adaptive value reset improper • 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.
1		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.
2		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. (See ON-BOARD DIAGNOSTIC TEST [MZ-CD 1.6 (Y6) (EURO5 emission level)].) • Is the other PENDING CODE/DTC also present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZ-CD 1.6 (Y6) (EURO5 emission level)].)
3		No	Go to the next step.
4	INSPECT FUEL FILTER • Switch the ignition to off. • Inspect the fuel filter for clogging or damage. • Is there any malfunction?	Yes	Replace the fuel filter, then go to Step 11.
4		No	Go to the next step.
5	INSPECT FUEL LINE FOR LEAKAGE • Inspect for fuel leakage in the following fuel lines: ― Fuel tank and fuel filter ― Fuel filter and supply pump ― Supply pump and common rail ― Common rail and fuel injector • Is there any malfunction?	Yes	Repair or replace suspect fuel line, then go to Step 11.
5		No	Go to the next step.
6	INSPECT FUEL METERING VALVE CONTROL CIRCUIT FOR SHORT TO GROUND • Remove the fuel metering valve and PCM connectors. • Inspect for continuity between fuel metering valve terminal A and body ground. • Is there any continuity?	Yes	Repair or replace the wiring harness for a possible short to ground, then go to Step 11.
6		No	Go to the next step.
7	INSPECT LOW PRESSURE SIDE FUEL LINE FOR RESTRICTION • Remove and inspect for fuel restriction in the following fuel lines: ― Fuel tank and fuel filter ― Fuel filter and supply pump • Is there any restriction?	Yes	Repair or replace suspect fuel line, then go to Step 11.
7		No	Go to the next step.
8	INSPECT FUEL PRESSURE SENSOR • Inspect the fuel pressure sensor. • Is there any malfunction?	Yes	Go to the next step.
8		No	Go to Step 10.
9	INSPECT FUEL INJECTOR FOR STUCK OPEN • Remove the all fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].) • Is there any stuck open?	Yes	Replace the suspect fuel injector, then go to Step 11. (See FUEL INJECTOR REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)
9		No	Replace the common rail, then go to Step 11. (See COMMON RAIL REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)
10	PERFORM HIGH PRESSURE FUEL SYSTEM LEARNED VALUES RESET • Clear the DTC from the PCM memory using the M-MDS. • Perform the HIGH PRESSURE FUEL SYSTEM LEARNED VALUES RESET. (See HIGH PRESSURE FUEL SYSTEM LEARNED VALUES RESET [MZ-CD 1.6 (Y6) (EURO5 emission level)].) • Run the vehicle under the FREEZE FRAME DATA stored condition. • Is the same DTC present?	Yes	Replace the fuel metering valve. (See FUEL METERING VALVE REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].) Then go to the next step.
10		No	Go to Step 12.
11	VERIFY THAT DTC P228C:00, P228C:7B 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. (See PCM REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6) (EURO5 emission level)].) Go to the next step.
11		No	Go to the next step.
12	VERIFY AFTER REPAIR PROCEDURE • Perform the after repair procedure. (See AFTER REPAIR PROCEDURE [MZ-CD 1.6 (Y6) (EURO5 emission level)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZ-CD 1.6 (Y6) (EURO5 emission level)].)
12		No	DTC troubleshooting completed.