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Engine Mechanical [SKYACTIVE-G2.0L]: Diagnosis Mazda CX-5 I

Mechanical 10 illustrations ~1659 words

Idle Speed Inspection

Note. The idle speed cannot be adjusted. The M-MDS is required to verify the idle speed.

  1. Complete the engine tune-up preparation. (See «ENGINE TUNE-UP PREPARATION»(ref-615399-S40068392262014051000000) ).
  2. Verify that the idle speed (M-MDS PID: RPM) is within the specification using the PID/data monitor function of the M-MDS. (See «PCM INSPECTION [SKYACTIV-G 2.0]»(ref-615396-S32068462542014051000000) ). If there is malfunction, refer to "ENGINE SYMPTOM TROUBLESHOOTING". (See «SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-G 2.0]»(ref-615397-S21556449172014051000000) ). Idle speed (MTX: Neutral position, ATX: P, N position) MTX: 500-600 rpm ATX: 550-650 rpm

Ignition Timing Inspection

Note. The ignition timing cannot be adjusted. The M-MDS is required to verify the ignition timing.

  1. Complete the engine tune-up preparation. (See «ENGINE TUNE-UP PREPARATION»(ref-615399-S40068392262014051000000) ).
  2. Verify the ignition timing (M-MDS PID: SPARKADV) using the PID/data monitor function of the M-MDS. (See «PCM INSPECTION [SKYACTIV-G 2.0]»(ref-615396-S32068462542014051000000) ). Ignition timing Approx. BTDC 14°
  3. Verify that ignition timing advances when the engine speed increases gradually. If there is malfunction, refer to "ENGINE SYMPTOM TROUBLESHOOTING". (See «SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-G 2.0]»(ref-615397-S21556449172014051000000) ).

Idle Mixture Inspection

  1. Verify that the idle speed and ignition timing are within the specification. (See «IDLE SPEED INSPECTION»(ref-615399-S15124057922014051000000) ). (See «IGNITION TIMING INSPECTION»(ref-615399-S23879093152014051000000) ).
  2. Insert an exhaust gas analyzer into the tailpipe.
  3. Verify that the CO and HC concentrations are within regulation. If there is malfunction, refer to "ENGINE SYMPTOM TROUBLESHOOTING". (See «SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-G 2.0]»(ref-615397-S21556449172014051000000) ). If no malfunction is detected, replace the catalytic converter. (See «EXHAUST SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615409-S05941657582014051000000) ). CO concentration Within the regulation HC concentration Within the regulation

Idle-up Speed Control Inspection

Note. The idle speed cannot be adjusted. The M-MDS is required to verify the idle speed.

  1. Complete the engine tune-up preparation. (See «ENGINE TUNE-UP PREPARATION»(ref-615399-S40068392262014051000000) ).
  2. Verify that the idle speed according to each load (M-MDS PID: RPM) is within the specification using the PID/data monitor function of the M-MDS (except idle speed decrease after applying load). (See «PCM INSPECTION [SKYACTIV-G 2.0]»(ref-615396-S32068462542014051000000) ). If the engine speed is not within the specification when a specified load is applied, inspect the related input parts, wiring harnesses, and connectors. Idle-up speed (MTX: Neutral position, ATX: P, N position) A/C on: 650-800 rpm Electrical loads on: 600-750 rpm

DRIVE BELT AUTO TENSIONER INSPECTION [SKYACTIV-G 2.0]

WARNINGA hot engine can cause severe burns. Turn off the engine and wait until it is cool before servicing.
CAUTIONIf the rubber part of the drive belt auto tensioner is damaged by a screwdriver or other tool, oil in the hydraulic pressure unit could leak and the tensioner may not operate normally. Be careful not to damage the rubber part of the drive belt auto tensioner.

Identifying Drive Belt Auto Tensioner And Rubber Part. Scheme 2

Scheme 2: Identifying Drive Belt Auto Tensioner And Rubber Part
Scheme 2: Identifying Drive Belt Auto Tensioner And Rubber Part

Scheme 3

Scheme 3
Scheme 3

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6
  1. Remove the generator drive belt. (See «DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S40242248072014051000000) ). CAUTION: To prevent damage to the drive belt auto tensioner, do not apply excessive torque after the tensioner moves full-stroke.
  2. Insert the wrench into the cast hexagon on the drive belt auto tensioner, slowly turn it in the direction of the arrow shown in the figure, and fully depress. (Scheme 3): Turning Cast Hexagon On Drive Belt Auto Tensioner Using Wrench NOTE: The drive belt auto tensioner is operated in the direction of the arrow by turning the wrench. (Scheme 4): Adjusting Drive Belt Auto Tensioner
  3. Verify that the drive belt auto tensioner moves smoothly in the operational direction. If it does not move smoothly, air infiltration into the inner hydraulic pressure unit can be considered. Move the drive belt auto tensioner up and down at full-stroke three times to bleed the air. After bleeding the air, if the drive belt auto tensioner still does not move smoothly when re-inspecting, replace the drive belt auto tensioner. (See «GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615412-S10522659032014051000000) ). NOTE: By moving the drive belt auto tensioner up and down full-stroke three times, the piston inside the tensioner moves to bleed the air. (Scheme 5): Checking Drive Belt Auto Tensioner Movement
  4. Turn the drive belt auto tensioner pulley by hand and verify that it rotates smoothly. If it does not move smoothly, replace the drive belt auto tensioner. (See «GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615412-S10522659032014051000000) ).
  5. Install the generator drive belt. (See «DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S40242248072014051000000) ). (Scheme 6): Checking Drive Belt Auto Tensioner Pulley

COMPRESSION INSPECTION [SKYACTIV-G 2.0]

WARNINGHot engines and oil can cause severe burns. Be careful not to burn yourself during removal/installation of each component. Fuel vapor is hazardous. It can very easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete the "Fuel Line Safety Procedure". (See BEFORE SERVICE PRECAUTION [SKYACTIV-G 2.0] ).

Scheme 7

Scheme 7
Scheme 7
  1. Verify that the battery is fully charged. (See «BATTERY INSPECTION [SKYACTIV-G 2.0]»(ref-615412-S10301123762014051000000) ). Recharge it if necessary. (See «BATTERY RECHARGING [SKYACTIV-G 2.0]»(ref-615412-S16236247302014051000000) ).
  2. Warm up the engine to the normal operating temperature.
  3. Perform "Fuel Line Safety Procedures". (See «BEFORE SERVICE PRECAUTION [SKYACTIV-G 2.0]»(ref-615403-S21667172932014051000000) ).
  4. Remove the following parts. Plug hole plate. (See «PLUG HOLE PLATE REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S02010689542014051000000) ). Ignition coil/ion sensors. (See «IGNITION COIL/ION SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615408-S22625302992014051000000) ). Spark plugs. (See «SPARK PLUG REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615408-S39414328902014051000000) ). Fuel pump relay Fuel injector relay
  5. Measure the compression pressure using the following procedure. Press a compression gauge into the spark plug hole. Fully depress the accelerator pedal. Crank the engine and measure the compression pressure. Compression Standard: 885 kPa {9.02 kgf/cm 2,128 psi} [300 rpm] Minimum: 708 kPa {7.22 kgf/cm 2,103 psi} [300 rpm] Maximum difference between cylinders: 150 kPa {1.53 kgf/cm 2, 21.8 psi} (Scheme 7): Measuring Compression Pressure Using Tools NOTE: Because the SKYACTIV-G 2.0 retards the intake valve closing timing, compression pressure is low. Perform Steps ( 1 ) to ( 3 ) for all cylinders. If it is less than the minimum specification, or there is a cylinder with a maximum value that exceeds the other cylinders, add a small quantity of engine oil through the spark plug hole and perform Steps ( 1 ) to ( 3 ). If the pressure increases by adding the engine oil, the piston ring or the cylinder surface is worn, or they are damaged. Perform overhaul servicing. If the pressure does not increase, valve seizure, valve attachment malfunction, or pressure leakage from the cylinder head gasket might be occurring. Perform overhaul servicing. If the measured value is high, it is possible that there is an error in the electric variable valve timing system.
  6. Remove the compression gauge.
  7. Install the following parts. Fuel injector relay Fuel pump relay Spark plugs. (See «SPARK PLUG REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615408-S39414328902014051000000) ). Ignition coil/ion sensors. (See «IGNITION COIL/ION SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615408-S22625302992014051000000) ). Plug hole plate. (See «PLUG HOLE PLATE REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S02010689542014051000000) ).

ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION [SKYACTIV-G 2.0]

WARNINGA hot engine can cause severe burns. Turn off the engine and wait until it is cool before servicing.
CAUTIONDo not disassemble the electric variable valve timing motor/driver because it is a precision unit. Do not apply excessive force when rotating the electric variable valve timing motor joint. If it is rotated with excessive force, the electric variable valve timing motor could be damaged.

Scheme 8

Scheme 8
Scheme 8
  1. Disconnect the negative battery cable. (See «NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0]»(ref-615412-S04991947062014051000000) ).
  2. Remove the plug hole plate. (See «PLUG HOLE PLATE REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S02010689542014051000000) ).
  3. Remove the electric variable valve timing motor/driver. (See «ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S26956923822014051000000) ).
  4. Rotate the electric variable valve timing motor joint to the left and right by your fingers and verify that it rotates smoothly in 15° increments. NOTE: Rotate the joint area smoothly using only the tips of your fingers. The electric variable valve timing motor joint moves in 15° increments, and if the joint is moved 24 times, it rotates one full rotation. If it does not rotate smoothly, replace the electric variable valve timing motor/driver. (See «ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S26956923822014051000000) ).
  5. Install in the reverse order of removal. (Scheme 8): Checking Electric Variable Valve Timing Motor Joint Rotation

HYDRAULIC VARIABLE VALVE TIMING ACTUATOR INSPECTION [SKYACTIV-G 2.0]

WARNINGA hot engine can cause severe burns. Turn off the engine and wait until it is cool before servicing.
CAUTIONDo not disassemble the hydraulic variable valve timing actuator because it is a precision unit.

Scheme 9

Scheme 9
Scheme 9
  1. Disconnect the negative battery cable. (See «NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0]»(ref-615412-S04991947062014051000000) ).
  2. Remove the plug hole plate. (See «PLUG HOLE PLATE REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S02010689542014051000000) ).
  3. Remove the ignition coil/ion sensors. (See «IGNITION COIL/ION SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615408-S22625302992014051000000) ).
  4. Remove the cylinder head cover. (See «TIMING CHAIN REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S31439702542014051000000) ).
  5. Verify that the notch of the rotor and projection of the cover on the hydraulic variable valve timing actuator are aligned and fitted. If the notch of the rotor and projection of the cover are not aligned, rotate the crankshaft in the direction the engine rotates two turns and verify that they are aligned. If the notch of the rotor and projection of the cover are still not aligned, replace the hydraulic variable valve timing actuator. (See «ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S02446081682014051000000) ). If, when turning the crankshaft, there is a slapping noise from the hydraulic variable valve timing actuator each time before the cam reaches its maximum lift, it means that the actuator is not secured. Replace the hydraulic variable valve timing actuator. (See «ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S02446081682014051000000) ). (Scheme 9): Identifying Hydraulic Variable Valve Timing Actuator Cover, Rotor, Projection And Notch
  6. Install in the reverse order of removal.

ELECTRIC VARIABLE VALVE TIMING ACTUATOR INSPECTION [SKYACTIV-G 2.0]

WARNINGA hot engine can cause severe burns. Turn off the engine and wait until it is cool before servicing.
CAUTIONDo not disassemble the electric variable valve timing actuator because it is a precision unit.

Scheme 10

Scheme 10
Scheme 10
  1. Disconnect the negative battery cable. (See «NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0]»(ref-615412-S04991947062014051000000) ).
  2. Remove the plug hole plate. (See «PLUG HOLE PLATE REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S02010689542014051000000) ).
  3. Remove the electric variable valve timing motor/driver. (See «ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S26956923822014051000000) ).
  4. Rotate the eccentric shaft of the electric variable valve timing actuator by hand and verify that it rotates smoothly. If it does not rotate smoothly, replace the electric variable valve timing actuator. (See «ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S02446081682014051000000) ). NOTE: Hook a finger onto the joint groove of the eccentric shaft to rotate the shaft easily. The eccentric shaft stops rotating at the maximum retard position when it is rotated counterclockwise as viewed from the front, and at the maximum advance position when rotated clockwise. The eccentric shaft rotates 15.8 turns from the maximum retard position to the maximum advance position. (Scheme 10): Checking Electric Variable Valve Timing Actuator Eccentric Shaft Rotation
  5. Install in the reverse order of removal.

HLA Troubleshooting

ItemOccurrencePossible causeAction
1After replacing oil, sound occurs when starting engineOil shortage in oil passageMaintain the engine speed between 2,000 to 3,000 rpm for approx. 2 s and 10 min (1) , and verify that the sound disappears. If the sound disappears, the HLA is normal. If the sound does not disappear, go to item 5.
2Sound occurs at instant when engine is started on vehicle left for 1 day
3Starter cranked for 3 s or more and sound occurs directly after engine is startedHLA oil shortage
4Sound occurs directly after engine is started with newly replaced HLA
5Sound occurs continuously for 10 min or moreInsufficient oil pressureInspect the oil pressure. (See OIL PRESSURE INSPECTION [SKYACTIV-G 2.0] ). If less than the specification, inspect each part of the engine.
HLA malfunctionInspect the HLA. (See HLA INSPECTION ).
6Sound occurs during idling after high-speed drivingIncorrect engine oil levelInspect the engine oil level. (See ENGINE OIL LEVEL INSPECTION [SKYACTIV-G 2.0] ).
Engine oil deteriorationReplace the engine oil. (See ENGINE OIL REPLACEMENT [SKYACTIV-G 2.0] ).
(1) Period of time engine oil flows to the HLA, this value includes tolerance caused by the ambient temperature and the oil used.
(1)Period of time engine oil flows to the HLA, this value includes tolerance caused by the ambient temperature and the oil used.

Scheme 11

Scheme 11: HLA Inspection
Scheme 11: HLA Inspection
  1. Disconnect the negative battery cable. (See «NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0]»(ref-615412-S04991947062014051000000) ).
  2. Remove the plug hole plate. (See «PLUG HOLE PLATE REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S02010689542014051000000) ).
  3. Remove the ignition coil/ion sensors. (See «IGNITION COIL/ION SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615408-S22625302992014051000000) ).
  4. Remove the cylinder head cover. (See «TIMING CHAIN REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S31439702542014051000000) ).
  5. Press the rocker arm from above and verify that the HLA does not drop. If the HLA drops, replace the HLA. (See «HYDRAULIC LASH ADJUSTER (HLA) REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615399-S31012097012014051000000) ).
  6. Install in the reverse order of removal. (Scheme 11): Identifying Rocker Arm And Hydraulic Lash Adjuster

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