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2016 – MX-5 – Transmission/Transaxle

MECHANICAL SYSTEM TEST [SJ6A-EL]

Mechanical System Test Preparation

1. Apply the parking brake firmly, and set the wheel blocks for both the front and rear wheels.

2. Inspect the engine coolant level. (See ENGINE COOLANT LEVEL INSPECTION [SKYACTIV-G 2.0].)

3. Inspect the engine oil level. (See ENGINE OIL LEVEL INSPECTION [SKYACTIV-G 2.0].)

4. Inspect the ATF level. (See AUTOMATIC TRANSMISSION FLUID (ATF) LEVEL ADJUSTMENT [SJ6A-EL].)

5. Inspect the idle speed. (See ENGINE TUNE-UP [SKYACTIV-G 2.0].)

6. Inspect the ignition timing. (See ENGINE TUNE-UP [SKYACTIV-G 2.0].)

Line Pressure Test

1. Perform mechanical system test preparation. (See Mechanical System Test Preparation.)

WARNING:

• Removing the square head plug when the ATF is hot can be dangerous. Hot ATF can come out of the opening and badly burn you. Before removing the square head plug, allow the ATF to cool.

NOTE:

• Use a suitable oil pressure gauge that corresponds to the line pressure because the maximum scale value differs depending on the oil pressure gauge.

2. Remove the test plug and O-ring from the line pressure inspection port.

3. Install SSTs (49 D019 908, 49 D019 909, 49 D019 910, 49 D019 911, 49 D019 913) to the line pressure inspection port as shown in the figure.

4. Start the engine and warm it up until the ATF reaches 60—70 °C {140—158 °F}.

5. Shift the selector lever to the D position.

6. Measure the line pressure while idling in D position.

7. Measure the line pressures while idling in the M (1st gear) and R positions using the same procedure.

8. Stop the engine.

9. Change the low-pressure gauge ( 49 D019 908) to the high-pressure gauge ( 49 D019 907).

10. Start the engine.

11. Strongly depress the brake pedal with the left foot.

12. Shift the selector lever to the D position.

CAUTION:

• To prevent damage to the transmission, measure the line pressure while stalling (Step 13—14) within 5 s.

13. Slowly depress the accelerator pedal fully with the right foot all the way down.

14. Read the line pressure quickly while stalling, and remove the right foot from the accelerator pedal.

15. Shift the selector lever to the N position and idle for 1 min or more.

16. Measure the line pressure while stalling for positions other than D in the same procedure.

• If there is any malfunction, one of the following causes may have occurred:

Condition	Possible cause
Higher in R, D, and M (1GR) position	Line pressure control solenoid malfunction Primary regulator valve malfunction
Lower in R, D, and M (1GR) position	Line pressure control solenoid malfunction Primary regulator valve malfunction Oil pump malfunction
Lower in D position	Hydraulic circuit of D malfunction C1 clutch malfunction
Lower in R position	Hydraulic circuit of R malfunction C3 clutch malfunction B4 brake malfunction

Line pressure

Measurement conditions		Specification (kPa {kgf/cm2, psi})
D and M (1GR) position	Idle	350—430 kPa {3.57—4.38 kgf/cm2, 50.8—62.3 psi}
	Stall	900—1,080 kPa {9.18—11.01 kgf/cm2, 131.0—156.6 psi}
R position	Idle	760—950 kPa {7.75—9.68 kgf/cm2, 111—137 psi}
	Stall	1,410—1,630 kPa {14.38—16.62 kgf/cm2, 204.6—236.4 psi}

WARNING:

• Removing the square head plug when the ATF is hot can be dangerous. Hot ATF can come out of the opening and badly burn you. Before removing the square head plug, allow the ATF to cool.

17. Remove the SSTs.

18. Install the test plug and O-ring in the inspection port.

Tightening torque

• 5.9—8.8 N·m {61—89 kgf·cm, 53—77 in·lbf}

Stall Speed Test

1. Perform mechanical system test preparation. (See Mechanical System Test Preparation.)

2. Start the engine.

3. Strongly depress the brake pedal with the left foot.

4. Shift the selector lever to the D position.

CAUTION:

• To prevent damage to the transmission, measure the line pressure while stalling (Step 5—6) within 5 s.

5. Slowly depress the accelerator pedal fully with the right foot all the way down.

6. Read the engine speed quickly when the speed is stabilized, and remove the right foot from the accelerator pedal.

7. Shift the selector lever to the N position and idle for 1 min or more.

8. Measure the stall speed in the M (1st gear) and R positions using the same procedure.

• If there is any malfunction, one of the following causes may have occurred:

Condition	Possible cause
Lower in R, D, and M (1GR) position	Engine lack of power Torque converter one-way clutch malfunction
Higher in D and M (1GR) position	Insufficient line pressure C1 clutch malfunction (slippage) F3 one-way clutch malfunction
Higher in R position	Insufficient line pressure B4 brake malfunction (slippage) C3 clutch malfunction (slippage) F1 one-way clutch malfunction
Higher in R, D, and M (1GR) position	Insufficient line pressure Oil leakage from each position circuit

Engine stall speed

Measurement conditions	Specification (rpm)
D, R, M	2,546—2,846

Time Lag Test

1. Perform mechanical system test preparation. (See Mechanical System Test Preparation.)

2. Start the engine.

3. Shift the selector lever from the N position to the D position with the brake pedal depressed.

4. Measure the time until the shift shock is felt firmly after shifting.

5. Measure the time lag from the N position to the R position using the same procedure.

• If there is any malfunction, one of the following causes may have occurred:

Condition	Possible Cause
N → D shift	Insufficient line pressure C1 clutch malfunction (slippage) F3 one-way clutch malfunction
N → R shift	Insufficient line pressure C1 clutch malfunction (slippage) C3 clutch malfunction (slippage) F1 one-way clutch malfunction

Time lag

• N position → D position: 0.7 s or less

• N position → R position: 1.2 s or less

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