Menu +
Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

NO.6 CRANKS NORMALLY BUT WILL NOT START [SKYACTIV-G 2.0]

< Previous Next >

2016 – MX-5 – Engine

NO.6 CRANKS NORMALLY BUT WILL NOT START [SKYACTIV-G 2.0]

6

CRANKS NORMALLY BUT WILL NOT START

DESCRIPTION

  • Starter cranks engine at normal speed but engine will not run.

  • Refer to symptom troubleshooting “NO.5 ENGINE STALLS-AFTER START/AT IDLE” if this symptom appears after engine stalls.

  • Fuel is in tank.

  • Battery is in normal condition.

POSSIBLE CAUSE

  • Because engine is started with accelerator pedal fully depressed, it goes into dechoke mode and fuel is not injected

  • Engine overheating

  • PCM DTC is stored

  • Erratic signal to PCM

    • APP sensor or related circuit malfunction

    • ECT sensor No.1 or related circuit malfunction

    • MAF sensor or related circuit malfunction

    • A/F sensor or related circuit malfunction

    • HO2S or related circuit malfunction

    • Improper air/fuel mixture ratio control

  • Power is not supplied from main relay

  • Power is not supplied from fuel injector relay and/or fuel pump relay

  • Improper operation of drive-by-wire control system

  • Purge solenoid valve malfunction

  • No signal from MAF sensor

  • Poor fuel quality

  • Air leakage from intake-air system

  • Vacuum leakage

  • Intake-air system restriction

  • Electrical connector disconnected

  • No battery power supply to PCM or poor ground

  • Fuel leakage

  • Fuse malfunction

  • No signal from CKP sensor

    • Loose installation

    • Damaged trigger wheel (crankshaft pulley)

    • Open or short circuit in related wiring harness

  • No signal from CMP sensor

    • Loose installation

    • Damaged trigger wheel (exhaust camshaft)

    • Open or short circuit in related wiring harness

  • Inadequate fuel pressure (high or low pressure side)

    • Open or short circuit in the fuel pump (low-side) body or related wiring harness

    • Fuel pressure sensor or related circuit malfunction

    • High pressure fuel pump malfunction

    • Spill valve control solenoid valve control circuit malfunction (damage to driver in PCM caused by short circuit to ground system)

    • Spill valve control solenoid valve malfunction (built-into high pressure fuel pump)

    • Fuel line restriction

    • Fuel filter clogged (built-into fuel pump unit)

    • Fuel pump (low-side) body mechanical malfunction

  • Incorrect fuel injection timing

  • Fuel injector malfunction

  • Improper intake valve timing

  • Improper exhaust valve timing

  • Improper operation of electric variable valve timing control system

    • Electric variable valve timing driver malfunction

    • Electric variable valve timing motor malfunction

    • Electric variable valve timing actuator malfunction

  • Improper operation of hydraulic variable valve timing control system

  • Low engine compression

  • Ignition system malfunction

  • Ignition coil malfunction

  • Vapor occurs around fuel pump (fuel problem)

  • Because vapor occurs in high pressure fuel pump, fuel injector cannot adjust fuel injection to correct amount

  • Exhaust system and/or TWC restricted

  • PCV valve malfunction

  • Injector driver (built-into PCM) malfunction

POSSIBLE CAUSE

WARNING:

  • The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:

    • Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.

    • Highly pressurized fuel may spray out if the fuel line is cut. Due to the following dangers occurring with a fuel spray, always complete the “Fuel Line Safety Procedure” to prevent the fuel from spraying. (See BEFORE SERVICE PRECAUTION [SKYACTIV-G 2.0].)

      • Fuel may cause irritation if it comes in contact with skin and eyes.

      • If fuel ignites and causes a fire, it may lead to serious injury or death, and damage to property and facilities.

    • Fuel is highly flammable and dangerous. Fuel line spills and leakage can cause serious injury or death, and damage to equipment. Always refer to the “Quick Release Connector Removal/Installation (fuel system)” before performing the fuel hose installation, and execute the “Fuel Leakage Inspection” after installation. (See QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].) (See AFTER SERVICE PRECAUTION [SKYACTIV-G 2.0].)

CAUTION:

  • Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

CAUTION:

  • Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.

Related PIDs

Item (definition)

Unit/Condition

Definition

Condition/Specification (Reference)

APP1

%

Accelerator pedal opening angle (absolute value) input from APP sensor No.1

  • Accelerator pedal released: Approx. 15.29%

  • Accelerator pedal fully depressed: Approx. 90.98%

V

APP sensor No.1 voltage

  • Accelerator pedal released: Approx. 0.77 V

  • Accelerator pedal fully depressed: Approx. 4.55 V

APP2

%

Accelerator pedal opening angle (absolute value) input from APP sensor No.2

  • Accelerator pedal released: Approx. 7.84%

  • Accelerator pedal fully depressed: Approx. 45.49%

V

APP sensor No.2 voltage

  • Accelerator pedal released: Approx. 0.38 V

  • Accelerator pedal fully depressed: Approx. 2.27 V

ECT

°C, °F

Engine coolant temperature input from ECT sensor No.1

  • Displays ECT

V

ECT sensor No.1 voltage
    Ignition switched ON (engine off)

  • ECT is 92 °C {198 °F}: Approx. 0.65 V

    Idle (after warm up)

  • ECT is 93 °C {199 °F}: Approx. 0.64 V

    Racing (Engine speed is 2,000 rpm)

  • ECT is 92 °C {198 °F}: Approx. 0.66 V

    Racing (Engine speed is 4,000 rpm)

  • ECT is 93 °C {199 °F}: Approx. 0.64 V

FUEL_PRES

KPa , mBar , psi, in H20

Fuel pressure input from fuel pressure sensor

  • Displays fuel pressure

V

Fuel pressure sensor voltage
    Ignition switched ON (engine off)

  • Fuel pressure is approx. 3.6 MPa {37 kgf/cm2, 522 psi}: Approx. 1.01 V (ECT is 92 °C {198 °F})

    Idle (after warm up)

  • Fuel pressure is approx. 3.45 MPa {35.2 kgf/cm2, 500 psi}: Approx. 1 V (ECT is 92 °C {198 °F})

    Racing (Engine speed is 2,000 rpm)

  • Fuel pressure is approx. 3.21 MPa {32.7 kgf/cm2, 466 psi}: Approx. 0.96 V (ECT is 86 °C {187 °F})

    Racing (Engine speed is 4,000 rpm)

  • Fuel pressure is approx. 5.59 MPa {57.0 kgf/cm2, 811 psi}: Approx. 1.29 V (ECT is 84 °C {183 °F})

LOAD

%

Ratio of actual amount of intake air to the maximum air charging amount (mass volume) of cylinder

  • Idle (after warm up): Approx. 27.05% (ECT is 91 °C {196 °F})

  • Racing (engine speed is 2,000 rpm): Approx. 16.86% (ECT is 89 °C {192 °F})

  • Racing (engine speed is 4,000 rpm): Approx. 17.64% (ECT is 87 °C {189 °F})

LONGFT1

%

Fuel learning correction amount estimated based on A/F sensor signal

  • Idle (after warm up): Approx. −1.56% (ECT is 91 °C {196 °F})

  • Racing (engine speed is 2,000 rpm): 2.34% (ECT is 89 °C {192 °F})

  • Racing (engine speed is 4,000 rpm): 2.34% (ECT is 87 °C {189 °F})

MAF

g/Sec

Mass air flow input from MAF sensor

  • Displays MAF

V

MAF sensor voltage

  • Ignition switched ON (engine off) (MAF: 0.39 g/s {0.052 lb/min}): Approx. 0.72 V (ECT is 89 °C {192 °F})

  • Idle (after warm up) (MAF: 4.29 g/s {0.567 lb/min}): Approx. 1.15 V (ECT is 88 °C {190 °F})

  • Racing (engine speed is 2,000 rpm) (MAF: 4.32 g/s {0.571 lb/min}): Approx. 1.15 V (ECT is 89 °C {192 °F})

  • Racing (engine speed is 4,000 rpm) (MAF: 12.71 g/s {1.681 lb/min}): Approx. 1.66 V (ECT is 89 °C {192 °F})

O2S11

µA

A/F sensor current

  • Idle (after warm up): −59 µA (ECT is 92 °C {198 °F})

  • Deceleration fuel cut (accelerator pedal released from engine speed of 4,000 rpm or more): Approx. 3.48 mA (ECT is 92 °C {198 °F})

O2S12

V

HO2S voltage

  • Idle (after warm up): 0—1.0 V (ECT is 91 °C {196 °F})

  • Deceleration fuel cut (accelerator pedal released from engine speed of 4,000 rpm or more): Approx. 0 V (ECT is 92 °C {198 °F})

RPM

RPM

Engine speed

  • Displays engine speed

SHRTFT1

%

Fuel feedback correction amount estimated based on A/F sensor signal

  • Idle (after warm up): Approx. 0% (ECT is 91 °C {196 °F})

  • Racing (engine speed is 2,000 rpm): Approx. 0.78% (ECT is 89 °C {192 °F})

  • Racing (engine speed is 4,000 rpm): Approx. −21.87% (ECT is 87 °C {189 °F})

TP_REL

%

Throttle valve opening angle (relative value) with value at throttle valve fully close timing as the start point

  • Accelerator pedal released: Approx. 12.15%

  • Accelerator pedal fully depressed: Approx. 81.96%

VSS

KPH, MPH

Vehicle speed

  • Displays vehicle speed

Diagnostic Procedure

STEP

INSPECTION

RESULTS

ACTION

1

 INSPECT EFFECT OF VEHICLE CONDITION FOR MALFUNCTION

  • Verify how the customer drives the vehicle by asking the customer the following:

    • Because engine is started with accelerator pedal fully depressed, it goes into dechoke mode and fuel is not injected

  • Is the engine started with accelerator pedal fully depressed?

Yes

Explain to the customer that the vehicle is normal and give them advice on how to start the engine and a specific example of the conditions in which the engine goes into dechoke mode.

No

Go to the next step.

2

 VERIFY IF MALFUNCTION CAUSE IS OVERHEATING

Yes

Go to the next step.

No

The cause of this concern could be from the cooling system overheating.

3

 VERIFY PCM DTC

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

No

Go to the next step.

4

 VERIFY CURRENT INPUT SIGNAL STATUS

CAUTION:

  • While performing this step, always operate the vehicle in a safe and lawful manner.

  • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.

Yes

Go to the next step.

No

APP1, APP2 PIDs are not as specified:

ECT PID is not as specified:

MAF PID is not as specified:

O2S11, SHRTFT1, LONGFT1 PIDs are not as specified:

O2S12 PID is not as specified:

Repair or replace the malfunctioning part according to the inspection results.

5

 DETERMINE IF MALFUNCTION CAUSE IS DRIVE-BY-WIRE CONTROL SYSTEM OR OTHER

  • Will the engine run smoothly at part throttle?

Yes

Go to Step 7.

No

Go to the next step.

6

 INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION

Yes

Visually inspect the throttle body (damage/scratching).

  • If there is any malfunction:

    • Repair or replace the malfunctioning part according to the inspection results.

  • If there is no malfunction:

    • Go to the next step.

No

Repair or replace the malfunctioning part according to the inspection results.

7

 INSPECT PURGE CONTROL SYSTEM OPERATION

Yes

Go to the next step.

No

Repair or replace the malfunctioning part according to the inspection results.

8

 VERIFY IF MALFUNCTION CAUSE IS MAF SENSOR SIGNAL

NOTE:

  • If the inspection in Step 8 is performed, the PCM detects a DTC and performs fail-safe control. After performing the inspection, clear DTCs using the M-MDS.

  • Switch the ignition off.

  • Disconnect the MAF sensor/IAT sensor No.1 connector.

  • Start the engine.

  • Does the engine start normally?

Yes

Clean the MAF sensor.

Verify that the symptom is solved.

No

Go to the next step.

9

 INSPECT FUEL INJECTOR RELAY

  • Switch the ignition off.

  • Remove the fuel injector relay.

    (See RELAY LOCATION.)

  • Inspect the fuel injector relay.

    (See RELAY INSPECTION.)

  • Is there any malfunction?

Yes

Replace the fuel injector relay.

No

Reinstall the fuel injector relay, then go to the next step.

10

 INSPECT FUEL PUMP RELAY

Yes

Replace the fuel pump relay.

No

Inspect for short or open circuit between the following terminals:

  • IG1 relay terminal C—PCM terminal 2AQ

  • Battery positive terminal—PCM terminal 1CO

  • Battery positive terminal—PCM terminal 1CS

  • Battery positive terminal—PCM terminal 1CW

  • Battery positive terminal—PCM terminal 1DA

  • Battery positive terminal—PCM terminal 1DG

  • Battery positive terminal—PCM terminal 1DK

  • Main relay terminal C—Fuel injector relay terminal A

  • Fuel injector relay terminal E—Body ground

    • If there is any malfunction:

      • Repair or replace the malfunctioning part according to the inspection results.

    • If there is no malfunction:

      • Reinstall the fuel pump relay, then go to the next step.

11

 INSPECT RELATED PART CONDITION

Yes

Service if necessary.

  • Repeat this step.

No

Go to the next step.

12

 INSPECT FUEL PRESSURE (HIGH-SIDE)

    Specification:

  • 4—6 MPa {41—61 kgf/cm2, 581—870 psi}

Yes

Go to Step 14.

No

Lower than specification:

Higher than specification:

  • Go to the next step.

13

 INSPECT SPILL VALVE CONTROL SOLENOID VALVE CONTROL CIRCUIT FOR SHORT TO GROUND

  • Switch the ignition off.

  • Disconnect the high pressure fuel pump and PCM connectors.

  • Inspect for continuity between high pressure fuel pump terminal A (wiring harness-side) and body ground.

  • Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between high pressure fuel pump terminal A and PCM terminal 1EE.

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to ground.

If the malfunction remains:

No

Replace the high pressure fuel pump.

(See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

14

 INSPECT FUEL PRESSURE (LOW-SIDE)

    Specification:

  • 425—505 kPa {4.34—5.14 kgf/cm2, 61.7—73.2 psi}

Yes

Go to the next step.

No

Inspect the following:

  • Fuel line restriction

  • Fuel filter clogged

15

 INSPECT FUEL INJECTOR OPERATION

Yes

Go to the next step.

No

Repair or replace the malfunctioning part according to the inspection results.

16

 INSPECT FUEL TANK

Yes

Replace the fuel tank.

(See FUEL TANK REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

17

 INSPECT HIGH PRESSURE FUEL PUMP

Yes

Replace the high pressure fuel pump.

(See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

18

 INSPECT ENGINE COMPRESSION

Yes

Go to Step 24.

No

Go to the next step.

19

 INSPECT ELECTRIC VARIABLE VALVE TIMING DRIVER

Yes

Replace the electric variable valve timing motor/driver.

(See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

20

 INSPECT ELECTRIC VARIABLE VALVE TIMING MOTOR

Yes

Replace the electric variable valve timing motor/driver.

(See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

21

 INSPECT ELECTRIC VARIABLE VALVE TIMING ACTUATOR

Yes

Replace the electric variable valve timing actuator.

(See ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

22

 INSPECT HYDRAULIC VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION

Yes

Repair or replace the malfunctioning part according to the inspection results.

No

Go to the next step.

23

 INSPECT FOR MALFUNCTION DUE TO DEVIATED VALVE TIMING

Yes

Inspect for the following engine internal parts:

  • Cylinder

  • Piston ring

  • Intake valve

  • Exhaust valve

  • Such as cylinder head gasket

    • If there is any malfunction:

      • Repair or replace the malfunctioning part according to the inspection results.

No

Adjust the valve timing to the correct timing.

24

 INSPECT IGNITION SYSTEM OPERATION

NOTE:

  • Because the malfunction may have been resolved by removing the carbon adhered to the spark plug during the spark inspection for the spark plug, verify that the repairs have been completed.

Yes

Go to the next step.

No

Repair or replace the malfunctioning part according to the inspection results.

25

 INSPECT EXHAUST SYSTEM FOR RESTRICTION

  • Inspect for restriction in the exhaust system and the TWC.

  • Is there any restriction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

No

Go to the next step.

26

 INSPECT IF MALFUNCTION CAUSE IS PCV VALVE OR INJECTOR DRIVER (PCM INTEGRATED)

Yes

Replace the PCV valve.

(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Injector driver malfunction.

If the problem remains, overhaul the engine.

27

Verify the test results.

  • If normal, return to the diagnostic index to service any additional symptoms.

    (See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-G 2.0].)

  • If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.

    • If the vehicle is repaired, troubleshooting is completed.

    • If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.

< Previous Next >

© 2014 Mazda North American Operations, U.S.A.