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Home › Mazda › 2024 › MX-5 Miata Club › Repair and Diagnosis › Engine Performance › System › On-Board Diagnostic - Engine Control (1 Of 3) › DTC P0087-00: Fuel Pressure Sensor Circuit Range/Performance Problem › Function Inspection Using M-MDS

Function Inspection Using M-MDS

P0087-00: (PCM (SKYACTIV-G)) DIAGNOSTIC PROCEDURE

Step Inspection Results Action
1 PURPOSE: VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY 
  • Verify related Service Bulletins, on-line repair information, or Service Information availability.
  • Is any related Information available?
 Yes Perform repair or diagnosis according to the available information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
2 PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA 
  • Is the DTC P0087-00: on freeze frame data?
 Yes Go to the next step.
No Go to the troubleshooting procedure for DTC on freeze frame data.
(See DTC TABLE [PCM (SKYACTIV-G)] .)
3 PURPOSE: RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION 
  • Record the freeze frame data/snapshot data.
    NOTE:
    • Recording can be facilitated using the screen capture function of the PC.
 - Go to the next step.
4 PURPOSE: VERIFY IF MALFUNCTION CAUSED BY LACK OF FUEL 
 Yes Refill the fuel.
Go to Troubleshooting Diagnostic Procedure to perform the repair completion verification 1.
No Go to the next step.
5 PURPOSE: INSPECT FOR OTHER RELATED DTC 
  • Perform the DTC inspection for the PCM. (See DTC INSPECTION .)
  • Are any other DTCs displayed?
 Yes Repair or replace the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [PCM (SKYACTIV-G)] .)
Go to the next step.
No Go to the next step.
6 PURPOSE: VERIFY CONNECTOR CONNECTIONS 
  • Start the engine.
  • Access the PCM PID [FUEL_PRES] using the M-MDS.

    (See PID/DATA MONITOR INSPECTION .)

  • Does the PID value fluctuate when the following connectors are shaken?
    • Fuel pressure sensor
    • PCM
 Yes Repair or replace the applicable wiring harness or connector parts.
Go to Troubleshooting Diagnostic Procedure to perform the repair completion verification 1.
No Go to the next step.
7 PURPOSE: VERIFY FUEL PRESSURE (LOW-SIDE) MALFUNCTION 
NOTE:
  • Verify the fuel pressure on the low pressure side with the operation of the high pressure fuel pump turned off.
  • Bleed the remaining pressure in the fuel line using the following procedure.
    1. Switch the ignition off.
    2. Disconnect the high pressure fuel pump connector.
    3. Remove the fuel pump relay. (Refer to RELAY LOCATION in service information.)
    4. Start the engine and wait until the engine stalls.
  • Switch the ignition off.
  • Install the fuel pump relay.
  • Switch the ignition ON (engine off).
  • Access the [FUEL_PRES] PID and simulation item [FUEL_PUMP_REQ] using the M-MDS. (See PID/DATA MONITOR INSPECTION .) (See SIMULATION INSPECTION .)
  • Turn the simulation item [FUEL_PUMP_REQ] on.
  • Is the [FUEL_PRES] PID value 425-505 kPa {4.34-5.14 kgf/cm2 , 61.7-73.2 psi}?
 Yes Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 2.
No Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.
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