MECHANICAL SYSTEM TEST [CW6A-EL]

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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 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

3.  Inspect the engine oil level. (See ENGINE OIL LEVEL INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

4.  Inspect the ATF level. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [CW6A-EL].)

5.  Inspect the ignition timing. (See ENGINE TUNE-UP [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

6.  Inspect the idle speed. (See ENGINE TUNE-UP [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

7.  Verify that no DTCs are stored.

Line Pressure Test

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

2.  Remove the front under cover No.2. (See FRONT UNDER COVER No.2 REMOVAL/INSTALLATION.)

3.  Disconnect the wiring harness from the front crossmember. (Vehicle with i-ELOOP)

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4.  Disconnect the wiring harness clip from the harness bracket.

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5.  Remove the splash shield. (LH) (See SPLASH SHIELD REMOVAL/INSTALLATION.)

6.  Remove the harness bracket installation bolts from the transaxle and set it aside.

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7.  Remove the pressure detection square head plug.

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Warning

•  Do not remove the square head plug when the ATF temperature is high. Otherwise, ATF could overflow and cause severe burns or serious injury. Remove the square head plug when the transaxle and ATF temperatures are low.

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.

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

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9.  Start the engine.

10.  Warm up the engine until the ATF temperature is 60—70 °C {140—158 °F}.

11.  Shift the selector lever to the D position.

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

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

14.  Stop the engine.

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

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16.  Start the engine.

17.  Measure the line pressure while stalling in D position.

(1)  Strongly depress the brake pedal with the left foot.

(2)  Shift the selector lever to the D position.

Caution

•  To prevent damage to the transaxle, measure the line pressure while stalling (Step (3)—(4)) within 5 s.

(3)  Slowly depress the accelerator pedal fully with the right foot all the way down.

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

(5)  Shift the selector lever to the N position and idle for 1 min or more.

18.  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
Lower than specification	Lower in R, D, and M (1GR) position	•  Oil pump wear •  ATF leakage from oil pump, control valve body, and transaxle case •  Pressure regulator valve sticking •  Pressure control solenoid malfunction •  Solenoid reducing valve sticking
	Lower in D and M (1GR) position	•  ATF leakage from low clutch hydraulic circuit
	Lower in R and M (1GR) position	•  ATF leakage from low and reverse brake hydraulic circuit
	Lower in R position	•  ATF leakage from R-3-5 brake hydraulic circuit
Higher than specification	Higher in R, D, and M (1GR) position	•  Pressure regulator valve sticking •  Pressure control solenoid malfunction

19.  Stop the engine.

20.  Remove the SSTs.

Warning

•  If the SST is removed when the ATF temperature is high, ATF could overflow and cause severe burns or serious injury. Remove the SST when the transaxle and ATF temperatures are low.

21.  Install a new square head plug.

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Note

•  Do not reuse the square head plug because a sealant coating has been applied.

22.  Tighten the harness bracket installation bolts in the order shown in the figure.

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23.  Install the splash shield. (LH) (See SPLASH SHIELD REMOVAL/INSTALLATION.)

24.  Connect the wiring harness clip to the harness bracket.

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25.  Connect the wiring harness to the front crossmember. (Vehicle with i-ELOOP)

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26.  Install the front under cover No.2. (See FRONT UNDER COVER No.2 REMOVAL/INSTALLATION.)

Stall Test

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

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

3.  Start the engine.

4.  Measure the stall speed in the D position.

(1)  Strongly depress the brake pedal with the left foot.

(2)  Shift the selector lever to the D position.

Caution

•  To prevent damage to the transaxle, measure the stall speed (Step (3)—(4)) within 5 s.

(3)  Slowly depress the accelerator pedal fully with the right foot all the way down.

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

(5)  Shift the selector lever to the N position and idle for 1 min or more.

5.  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
Higher than specification	Higher in R, D, and M (1GR) position	Line pressure is low	•  Oil pump wear •  ATF leakage from oil pump, control valve body, and transaxle case •  Pressure regulator valve sticking •  TR control valve sticking •  Pressure control solenoid operation malfunction
		•  Low and reverse brake slippage
	Higher in D and M (1GR) position	•  Low clutch slippage
	Higher in R position	Perform road test to determine whether problem is in R-3-5 brake or low and reverse brake •  Engine brake operates in M (1GR) position ―  R-3-5 brake slippage •  Engine braking does not operate in M (1GR) position ―  Low and reverse brake slippage
Lower than specification	Lower in R, D, and M (1GR) position	•  Engine malfunction •  One-way clutch slippage in torque converter

Time Lag Test

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

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

3.  Start the engine.

4.  Measure the time lag from the N position to the D position.

(1)  Shift the selector lever from the N position to the D position with the brake pedal depressed.

(2)  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 to D selected	Longer than specification	•  Line pressure is low •  Low clutch slippage •  ATF leakage from low clutch hydraulic circuit •  ATF leakage from low and reverse brake hydraulic circuit •  Shift solenoid No.1 operation malfunction •  Shift solenoid No.4 operation malfunction
	Shorter than specification	•  Line pressure is high •  N-D accumulator operation malfunction •  Shift solenoid No.1 operation malfunction •  Shift solenoid No.4 operation malfunction
N to R selected	Longer than specification	•  Line pressure is low •  Low and Reverse brake slippage •  R-3-5 brake slippage •  ATF leakage from R-3-5 brake hydraulic circuit •  ATF leakage from low and reverse brake hydraulic circuit •  Shift solenoid No.3 operation malfunction •  Shift solenoid No.4 operation malfunction
	Shorter than specification	•  Line pressure is high •  N-R accumulator operation malfunction •  Shift solenoid No.3 operation malfunction •  Shift solenoid No.4 operation malfunction