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Home >> Mazda >> 2016 >> MX-5 Miata Club, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic - Engine Control System (1 Of 4) >> DTC P0172-00: Fuel Trim System Too Rich >> Function Inspection Using M-MDS

Function Inspection Using M-MDS

STEP INSPECTION RESULTS ACTION
1 PURPOSE: 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.
2 PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA 
  • Is the DTC P0172:00 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 2.0)] .)
3 RECORD FREEZE FRAME DATA/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS TO UTILIZE WITH REPEATABILITY VERIFICATION 
NOTE:
  • Recording can be facilitated using the screen capture function of the PC.
  • Record the FREEZE FRAME DATA/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (fuel system related) on the repair order.
 - Go to the next step.
4 PURPOSE: VERIFY IF INPUT SIGNAL TO PCM AFFECTS FUEL INJECTION 
 Yes Inspect the suspected sensor and related wiring harness.
  • If there is any malfunction:
    • Repair or replace the malfunctioning part.
    • Go to the troubleshooting procedure to perform the procedure from Step 12.
  • If there is no malfunction:
    • Go to the next step.
No Go to the next step.
5 PURPOSE: VERIFY CONNECTOR CONNECTIONS 
  • Start the engine.
  • Access the following PIDs using the M-MDS:

    (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)] .)

    • FUEL_PRES
    • FP
    • EVAPCP
    • MAF
    • MAP
    • MAP_V
    • IAT2
    • VT_EX_ACT
    • VT_IN_ACT
  • When the following parts are shaken, does the PID value include a PID item which has changed?
    • Fuel pressure sensor
    • Purge solenoid valve
    • MAF sensor
    • MAP sensor/IAT sensor No. 2
    • OCV
    • Electric variable valve timing motor/driver
    • PCM
 Yes Repair or replace the applicable connector parts.
Go to the troubleshooting procedure to perform the procedure from Step 12.
No Go to the next step.
6 PURPOSE: VERIFY FUEL PRESSURE (HIGH-SIDE) MALFUNCTION 
  • Switch the ignition off.
  • Reconnect all disconnected connectors.
  • Start the engine and idle it.
  • Access the FUEL_PRES PID using the M-MDS.

    (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)] .)

  • Is the FUEL_PRES PID value approx. 3 MPa {31 kgf/cm 2  , 435 psi}  ?
 Yes Go to the next step.
No FUEL_PRES PID value is lower than 3 MPa {31 kgf/cm 2  , 435 psi}  :
  • Go to the troubleshooting procedure to perform the procedure from Step 1.

FUEL_PRES PID value is higher than 3 MPa {31 kgf/cm 2  , 435 psi}  :
  • Go to Step 9.
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.
    • Switch the ignition off.
    • Disconnect the high pressure fuel pump connector.
    • Disconnect the fuel pump relay.
    • Start the engine and wait until the engine stalls.
  • Switch the ignition off.
  • Install the fuel pump relay.
  • Switch the ignition ON (engine off).
  • Display PID FUEL_PRES and simulation item FP using the M-MDS.

    (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)] .)

  • Turn simulation item FP on.
  • Is the FUEL_PRES PID value 430 k Pa {4.38 kgf/cm 2  , 62.4 psi} or more? 
 Yes Go to the next step.
No Go to the troubleshooting procedure to perform the procedure from Step 1.
8 PURPOSE: VERIFY IF MAL FUNCTION CAUSED B Y FUEL INJECTOR IMPROPER OPERATION 
  • Switch the ignition off.
  • Reconnect all disconnected connectors.
  • Start the engine and idle it.
  • Access the following simulation items using the M-MDS:

    (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)] .)

    • INJ_1
    • INJ_2
    • INJ_3
    • INJ_4
  • Turn each fuel injector from on to off using the simulation items.
  • Does the vibration during idling worsen?
 Yes Go to the next step.
No Go to the troubleshooting procedure to perform the procedure from Step 2.
9 PURPOSE: VERIFY IF MAL FUNCTION CAUSED B Y PURGE SOLENOID VALVE IMPROPER OPERATION 
 Yes Go to the next step.
No Go to the troubleshooting procedure to perform the procedure from Step 3.
10 PURPOSE: VERIFY MAF SENSOR 
 Yes Go to the next step.
No Go to the troubleshooting procedure to perform the procedure from Step 4.
11 PURPOSE: VERIFY MAP SENSOR 
 Yes Go to the next step.
No Go to the troubleshooting procedure to perform the procedure from Step 6.
12 PURPOSE: VERIFY INTAKE VALVE TIMING 
  • Start the engine and idle it.
  • Access the following PIDs using the M-MDS:

    (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)] .)

    • VT_IN_ACT
    • VT_IN_DES
  • Depress the accelerator pedal to increase the engine speed.
  • Does the monitor value of the PID item VT_IN_ACT conform to the VT_IN_DES PID value?
 Yes Go to the next step.
No Go to the troubleshooting procedure to perform the procedure from Step 7.
13 PURPOSE: VERIFY EXHAUST VALVE TIMING 
  • Start the engine and idle it.
  • Access the following PIDs using the M-MDS:

    (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)] .)

    • VT_EX_ACT
    • VT_EX_DES
  • Depress the accelerator pedal to increase the engine speed.
  • Does the monitor value of the PID item VT_EX_ACT conform to the VT_EX_DES PID value?
 Yes Go to the next step.
No Go to the troubleshooting procedure to perform the procedure from Step 9.
14 PURPOSE: VERIFY A/F SENSOR 
 Yes Go to the next step.
No Go to the troubleshooting procedure to perform the procedure from Step 11.
15 PURPOSE: VERIFY DTC 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-G 2.0)] .)
Go to the troubleshooting procedure to perform the procedure from Step 1.
No Go to the troubleshooting procedure to perform the procedure from Step 1.
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