DTC P0087 [MZ-CD 1.6 (Y6) (EURO4 emission level)]

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DTC P0087

Fuel rail 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 for 0.8 s, the PCM determines that the fuel pressure is too low.

POSSIBLE CAUSE

•  Fuel metering valve malfunction (built-in fuel pump)

•  Supply pump malfunction

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

•  Fuel injector relief valve stuck open

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

•  Restriction in low-pressure side fuel line

•  Restriction or damage in fuel filter

•  PCM malfunction

DTC P0087	Fuel rail 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 for 0.8 s, the PCM determines that the fuel pressure is too low.
POSSIBLE CAUSE	• Fuel metering valve malfunction (built-in fuel pump) • Supply pump malfunction • Fuel pressure sensor malfunction (built-in common rail) • Fuel injector relief valve stuck open • Leakage in fuel line (High-pressure side, Low-pressure side) • Restriction in low-pressure side fuel line • Restriction or damage in fuel filter • 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) (EURO4 emission level)].) • Is the following PENDING CODE/DTC also present? ― P0191, P0192, P0193, P0251, P0252, P0253, P0254	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 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)].)
3		No	Go to the next step.
4	INSPECT FUEL LINE FOR LEAKAGE • Switch the ignition to OFF. • 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 10.
4		No	Go to the next step.
5	INSPECT FUEL METERING VALVE CONTROL CIRCUIT FOR SHORT TO GROUND • Switch the ignition to OFF. • 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 10.
5		No	Go to the next step.
6	INSPECT LOW PRESSURE SIDE FUEL LINE FOR RESTRICTION • Switch the ignition to OFF. • 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 10.
6		No	Go to the next step.
7	INSPECT FUEL PRESSURE SENSOR • Inspect the fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION [MZ-CD 1.6 (Y6) (EURO4 emission level)].) • Is there any malfunction?	Yes	Go to the next step.
7		No	Go to Step 10.
8	INSPECT FUEL INJECTOR RELIEF VALVE 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 10. (See FUEL INJECTOR REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)
8		No	Go to the next step.
9	INSPECT WHETHER MALFUNCTION IS IN FUEL PRESSURE SENSOR OR ELSEWHERE • Replace the common rail with one from another normal vehicle. (See COMMON RAIL REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].) • 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	Replace the supply pump, then go to next step. (See SUPPLY PUMP REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)
9		No	Replace the common rail, then go to the next step. (fuel pressure sensor malfunction) (See COMMON RAIL REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)
10	VERIFY THAT DTC P0087 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) (EURO4 emission level)].) Go to the next step.
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE • Perform the after repair procedure. (See AFTER REPAIR PROCEDURE [MZ-CD 1.6 (Y6) (EURO4 emission level)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
11		No	DTC troubleshooting completed.